The document outlines a 20-class RHCE administration program covering Linux administration topics like installation, commands, file systems, users/groups, networking, servers and databases. Each class is 4 hours including theory and labs. Key topics include installation, commands, file systems, users/groups permissions, shell scripting, boot process, software installation, servers like Apache, NFS, DNS, mail and MySQL. Assessments are given after every 2-3 classes to test skills learned.
Solving Real-Time Scheduling Problems With RT_PREEMPT and Deadline-Based Sche...peknap
In dealing with a real world problem of scheduling three classes of tasks – network packet forwarding, voice over IP and application level services for a home gateway device, the author found that mechanisms coming with vanilla Linux kernel are not enough. This talk will cover the unique real-time requirements for each task class, why moving softirq to process context with RT_PREEMPT patch is an important step in solving the problem and how a deadline based process scheduler would be a better solution than regular real-time scheduling classes.
Linux PREEMPT_RT improves the preemptiveness of the Linux kernel by allowing preemption everywhere except when preemption is disabled or interrupts are disabled. This reduces latency from preemption, critical sections, and interrupts. However, non-deterministic external interrupt events and timing as well as interrupt collisions can still cause unpredictable latency. Tracing tools can help analyze latency but practical issues remain in fully guaranteeing hard real-time behavior.
This document provides instructions for preparing for the first project in an operating systems course that uses Nachos as an instructional operating system. It includes directions to read about Nachos and related materials, and an overview of the key parts of Nachos including the operating system code and the machine emulator code. It also summarizes some of the key Nachos thread functions like Fork, Yield, and Sleep.
Design pipeline architecture for various stage pipelinesMahmudul Hasan
This document discusses the concepts of single-cycle control, multi-cycle control, and pipelining in processors. It explains that single-cycle control has a low CPI but a long clock period, while multi-cycle control has a short clock period but high CPI. Pipelining allows overlapping the execution of instructions to improve throughput. The document presents diagrams of 5-stage instruction pipelines and describes the fetch, decode, execute, memory, and write-back stages. It also discusses pipeline hazards and performance improvements from pipelining over single-cycle and multi-cycle designs.
Analysis of interrupt latencies in a real-time kernelGabriele Modena
This document analyzes interrupt latencies in a real-time kernel. It discusses how real-time operating systems must ensure operations complete within fixed deadlines to maintain predictability. When dealing with device drivers, this implies managing race conditions and fulfilling temporal constraints. The document evaluates the performance of the Linux real-time preempt patch using cyclictest to measure latency and compares its performance to the standard Linux kernel.
The Linux Scheduler: a Decade of Wasted Coresyeokm1
The talk I gave at Papers We Love #20 (Singapore) about this academic paper "The Linux Scheduler: a Decade of Wasted Cores" by a few researchers.
The video of this talk can be found here: https://engineers.sg/v/758
Here are some relevant links:
Paper: http://www.ece.ubc.ca/~sasha/papers/eurosys16-final29.pdf
Reference Slides: http://www.i3s.unice.fr/~jplozi/wastedcores/files/extended_talk.pdf
Reference summary: https://blog.acolyer.org/2016/04/26/the-linux-scheduler-a-decade-of-wasted-cores/
Salt is an open source configuration management and remote execution system. It allows users to remotely execute commands and manage configurations on multiple systems. Key features include a master-minion architecture with remote execution capabilities, a flexible and extensible design, and support for configuration management through states. States allow users to declaratively define the configuration of systems and ensure consistency across environments.
The document provides information about the person's role as a Linux System Engineer including responsibilities like installing hardware, networking, building servers, patching systems, and troubleshooting issues for developers, DBAs and other teams. It also answers questions about supporting different environments, recent challenges, scripting experience, and Linux fundamentals.
Solving Real-Time Scheduling Problems With RT_PREEMPT and Deadline-Based Sche...peknap
In dealing with a real world problem of scheduling three classes of tasks – network packet forwarding, voice over IP and application level services for a home gateway device, the author found that mechanisms coming with vanilla Linux kernel are not enough. This talk will cover the unique real-time requirements for each task class, why moving softirq to process context with RT_PREEMPT patch is an important step in solving the problem and how a deadline based process scheduler would be a better solution than regular real-time scheduling classes.
Linux PREEMPT_RT improves the preemptiveness of the Linux kernel by allowing preemption everywhere except when preemption is disabled or interrupts are disabled. This reduces latency from preemption, critical sections, and interrupts. However, non-deterministic external interrupt events and timing as well as interrupt collisions can still cause unpredictable latency. Tracing tools can help analyze latency but practical issues remain in fully guaranteeing hard real-time behavior.
This document provides instructions for preparing for the first project in an operating systems course that uses Nachos as an instructional operating system. It includes directions to read about Nachos and related materials, and an overview of the key parts of Nachos including the operating system code and the machine emulator code. It also summarizes some of the key Nachos thread functions like Fork, Yield, and Sleep.
Design pipeline architecture for various stage pipelinesMahmudul Hasan
This document discusses the concepts of single-cycle control, multi-cycle control, and pipelining in processors. It explains that single-cycle control has a low CPI but a long clock period, while multi-cycle control has a short clock period but high CPI. Pipelining allows overlapping the execution of instructions to improve throughput. The document presents diagrams of 5-stage instruction pipelines and describes the fetch, decode, execute, memory, and write-back stages. It also discusses pipeline hazards and performance improvements from pipelining over single-cycle and multi-cycle designs.
Analysis of interrupt latencies in a real-time kernelGabriele Modena
This document analyzes interrupt latencies in a real-time kernel. It discusses how real-time operating systems must ensure operations complete within fixed deadlines to maintain predictability. When dealing with device drivers, this implies managing race conditions and fulfilling temporal constraints. The document evaluates the performance of the Linux real-time preempt patch using cyclictest to measure latency and compares its performance to the standard Linux kernel.
The Linux Scheduler: a Decade of Wasted Coresyeokm1
The talk I gave at Papers We Love #20 (Singapore) about this academic paper "The Linux Scheduler: a Decade of Wasted Cores" by a few researchers.
The video of this talk can be found here: https://engineers.sg/v/758
Here are some relevant links:
Paper: http://www.ece.ubc.ca/~sasha/papers/eurosys16-final29.pdf
Reference Slides: http://www.i3s.unice.fr/~jplozi/wastedcores/files/extended_talk.pdf
Reference summary: https://blog.acolyer.org/2016/04/26/the-linux-scheduler-a-decade-of-wasted-cores/
Salt is an open source configuration management and remote execution system. It allows users to remotely execute commands and manage configurations on multiple systems. Key features include a master-minion architecture with remote execution capabilities, a flexible and extensible design, and support for configuration management through states. States allow users to declaratively define the configuration of systems and ensure consistency across environments.
The document provides information about the person's role as a Linux System Engineer including responsibilities like installing hardware, networking, building servers, patching systems, and troubleshooting issues for developers, DBAs and other teams. It also answers questions about supporting different environments, recent challenges, scripting experience, and Linux fundamentals.
The document provides an overview of User Mode Linux (UML), including what it is, how it works, alternatives, and how to use it. UML allows running the Linux kernel as a userspace process, enabling uses like kernel debugging, security testing, and hosting virtual servers. It works by modifying the host kernel to create separate address spaces for guest kernels and processes using hardware virtualization. Key components discussed include filesystems, networking using TUN/TAP devices, management scripts, backups using LVM snapshots and blocksync, and network monitoring tools like MRTG and iftop.
A Casual Teaching Tool for Large Size Computer Laboratories ans Small Size Se...Takashi Yamanoue
This document describes SOLAR-CATS, a peer-to-peer teaching tool for computer labs and small seminar classes. SOLAR-CATS allows teachers to share their screen with students in real-time without needing a dedicated server. It provides functions for remote operation, interactive operation with mutual exclusion, image sharing, and recording and replaying sessions. The author has used SOLAR-CATS successfully for over 5 years with computer literacy and security classes of up to 50 students. Compared to commercial alternatives, SOLAR-CATS' peer-to-peer design eliminates the need for specialized server hardware or software.
The document discusses building daemons in PHP. It explains why daemons are useful for running scheduled tasks and asynchronous processing. It then covers the core concepts of daemonizing a PHP process, handling signals, writing init scripts, and creating a package for easily building daemons. The package includes classes for running and building daemons that separate configuration from code. The document concludes by discussing plans to open source the daemon package and a monitoring system.
This document discusses using Fabric and Puppet together to streamline system administration tasks. Fabric can be used to execute tasks across multiple servers using Python, while Puppet defines infrastructure using code and templates. The document suggests using Fabric to set up environments and trigger Puppet deployments, while defining nodes and classes in Puppet. This allows taking advantage of Fabric's host management capabilities and Puppet's declarative approach. Initial Fabric functions would prepare environments, while global functions handle setup/teardown. Puppet would define the desired configuration to deploy using its domain-specific language.
Linux Server Deep Dives (DrupalCon Amsterdam)Amin Astaneh
Over the past few years the Linux kernel has gained features that allow us to learn more about what's really happening on our servers and the applications that run on them.
This talk will explore how these new features, particularly perf_events and ebpf, enable us to answer questions about what a Drupal site is doing in real time beyond what the standard logs, server performance tools, and even strace will reveal. Attendees will be provided a brief introduction to example uses of these tools to diagnose performance problems.
This talk is intended for attendees that are familiar with Linux, the command line, and have used host observability tools in the past (top, netstat, etc).
This document provides an overview of Linux basics, including key terms like kernel and shell; how to check Linux releases and upgrade systems; important file system directories; how to manage packages; environment variables; processes; user management; command enhancements like pipes and aliases; network management tools; and some terminal tips. It covers core Linux concepts and commands for new users to understand the basic workings and administration of the Linux operating system.
Is your profiler speaking the same language as you? -- Docklands JUGSimon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behaviour and permits the developers to discover application level issues.
MINCS - containers in the shell script (Eng. ver.)Masami Hiramatsu
This document provides an overview and demonstration of MINCS, a set of shell scripts that implement minimal Linux containers without using Docker or other container runtimes. It begins by explaining key container concepts like namespaces, then demonstrates how MINCS uses namespaces, overlay filesystems, and other Linux features to implement containerization functionality with just shell scripts. It shows the various MINCS scripts like minc, marten and minc-exec, and how they work together to setup namespaces, manage container images and run commands in containers. The document concludes by discussing potential future improvements and known limitations, emphasizing that containers can be built with existing Linux tools and that shell scripts are very capable.
This document discusses Android custom kernel and ROM design. It provides information on the speaker's custom kernel projects for the Nexus 4 and Nexus 5 devices, including the features and modifications made. It also covers the process of developing a custom kernel, including cloning the source code, adding features via patching or cherry-picking, and compiling the kernel. The document briefly discusses custom ROMs and the process for syncing ROM sources.
This document discusses malware analysis collaboration and automation. It describes setting up a virtualized malware analysis environment using QEMU/KVM with light-weight, copy-on-write disk clones for consistency and efficiency. It also covers automating tasks like provisioning new virtual machines, inserting and extracting files from guests, and capturing and replaying virtual machine sessions for collaborative training.
This document provides an overview of implementing an LTSP (Linux Terminal Server Project) at San Francisco State University to create a centralized thin client lab environment. Key points include:
- LTSP allows "thin" clients to connect to a Linux server where all programs are run, reducing hardware costs.
- The proposed setup includes an Edubuntu LTSP server with 20 Dell clients connected via a switch to access shared applications and services.
- Testing showed the server's CPU, RAM, disk and network usage increased predictably with additional users and applications like Firefox, OpenOffice and video playback.
This document discusses using Puppet for scalable systems management. It begins with challenges faced by system administrators and an introduction to Puppet. It covers installing and configuring Puppet, including certificate signing. It also discusses managing infrastructure with Puppet through classes, modules, and templates. Examples of Puppet configuration are provided.
This document discusses using Puppet for scalable systems management. It begins with challenges faced by system administrators and an introduction to Puppet. It covers installing and configuring Puppet, including certificate signing. It also discusses managing infrastructure with Puppet through classes, modules, and templates. Examples of Puppet configuration are provided.
Immutable infrastructure with Docker and containers (GlueCon 2015)Jérôme Petazzoni
"Never upgrade a server again. Never update your code. Instead, create new servers, and throw away the old ones!"
That's the idea of immutable servers, or immutable infrastructure. This makes many things easier: rollbacks (you can always bring back the old servers), A/B testing (put old and new servers side by side), security (use the latest and safest base system at each deploy), and more.
However, throwing in a bunch of new servers at each one-line CSS change is going to be complicated, not to mention costly.
Containers to the rescue! Creating container "golden images" is easy, fast, dare I say painless. Replacing your old containers with new ones is also easy to do; much easier than virtual machines, let alone physical ones.
In this talk, we'll quickly recap the pros (and cons) of immutable servers; then explain how to implement that pattern with containers. We will use Docker as an example, but the technique can easily be adapted to Rocket or even plain LXC containers.
Devoxx PL: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
Devoxx PL: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
DevoxxUK: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
Advanced Level Training on Koha / TLS (ToT)Ata Rehman
Advanced Level Training on Koha / Total Library Solution - TLS - (ToT), December 4-8, 2017 – PASTIC, Islamabad
All training material provided during this training can be found at: https://drive.google.com/drive/folders/1hwWGHV1iHgcpjK_tw6-Xgf-ZVUPchIS_
This document provides an overview of Mercurial, a distributed version control system. It discusses pros and cons of Mercurial compared to other version control systems like Subversion and Git. Key aspects covered include how Mercurial works with local repositories and working copies, inter-repository communication through commands like clone, pull and push. It also discusses features like tags, branches, handling large files, and workflows used at the author's game development company.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
The document provides an overview of User Mode Linux (UML), including what it is, how it works, alternatives, and how to use it. UML allows running the Linux kernel as a userspace process, enabling uses like kernel debugging, security testing, and hosting virtual servers. It works by modifying the host kernel to create separate address spaces for guest kernels and processes using hardware virtualization. Key components discussed include filesystems, networking using TUN/TAP devices, management scripts, backups using LVM snapshots and blocksync, and network monitoring tools like MRTG and iftop.
A Casual Teaching Tool for Large Size Computer Laboratories ans Small Size Se...Takashi Yamanoue
This document describes SOLAR-CATS, a peer-to-peer teaching tool for computer labs and small seminar classes. SOLAR-CATS allows teachers to share their screen with students in real-time without needing a dedicated server. It provides functions for remote operation, interactive operation with mutual exclusion, image sharing, and recording and replaying sessions. The author has used SOLAR-CATS successfully for over 5 years with computer literacy and security classes of up to 50 students. Compared to commercial alternatives, SOLAR-CATS' peer-to-peer design eliminates the need for specialized server hardware or software.
The document discusses building daemons in PHP. It explains why daemons are useful for running scheduled tasks and asynchronous processing. It then covers the core concepts of daemonizing a PHP process, handling signals, writing init scripts, and creating a package for easily building daemons. The package includes classes for running and building daemons that separate configuration from code. The document concludes by discussing plans to open source the daemon package and a monitoring system.
This document discusses using Fabric and Puppet together to streamline system administration tasks. Fabric can be used to execute tasks across multiple servers using Python, while Puppet defines infrastructure using code and templates. The document suggests using Fabric to set up environments and trigger Puppet deployments, while defining nodes and classes in Puppet. This allows taking advantage of Fabric's host management capabilities and Puppet's declarative approach. Initial Fabric functions would prepare environments, while global functions handle setup/teardown. Puppet would define the desired configuration to deploy using its domain-specific language.
Linux Server Deep Dives (DrupalCon Amsterdam)Amin Astaneh
Over the past few years the Linux kernel has gained features that allow us to learn more about what's really happening on our servers and the applications that run on them.
This talk will explore how these new features, particularly perf_events and ebpf, enable us to answer questions about what a Drupal site is doing in real time beyond what the standard logs, server performance tools, and even strace will reveal. Attendees will be provided a brief introduction to example uses of these tools to diagnose performance problems.
This talk is intended for attendees that are familiar with Linux, the command line, and have used host observability tools in the past (top, netstat, etc).
This document provides an overview of Linux basics, including key terms like kernel and shell; how to check Linux releases and upgrade systems; important file system directories; how to manage packages; environment variables; processes; user management; command enhancements like pipes and aliases; network management tools; and some terminal tips. It covers core Linux concepts and commands for new users to understand the basic workings and administration of the Linux operating system.
Is your profiler speaking the same language as you? -- Docklands JUGSimon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behaviour and permits the developers to discover application level issues.
MINCS - containers in the shell script (Eng. ver.)Masami Hiramatsu
This document provides an overview and demonstration of MINCS, a set of shell scripts that implement minimal Linux containers without using Docker or other container runtimes. It begins by explaining key container concepts like namespaces, then demonstrates how MINCS uses namespaces, overlay filesystems, and other Linux features to implement containerization functionality with just shell scripts. It shows the various MINCS scripts like minc, marten and minc-exec, and how they work together to setup namespaces, manage container images and run commands in containers. The document concludes by discussing potential future improvements and known limitations, emphasizing that containers can be built with existing Linux tools and that shell scripts are very capable.
This document discusses Android custom kernel and ROM design. It provides information on the speaker's custom kernel projects for the Nexus 4 and Nexus 5 devices, including the features and modifications made. It also covers the process of developing a custom kernel, including cloning the source code, adding features via patching or cherry-picking, and compiling the kernel. The document briefly discusses custom ROMs and the process for syncing ROM sources.
This document discusses malware analysis collaboration and automation. It describes setting up a virtualized malware analysis environment using QEMU/KVM with light-weight, copy-on-write disk clones for consistency and efficiency. It also covers automating tasks like provisioning new virtual machines, inserting and extracting files from guests, and capturing and replaying virtual machine sessions for collaborative training.
This document provides an overview of implementing an LTSP (Linux Terminal Server Project) at San Francisco State University to create a centralized thin client lab environment. Key points include:
- LTSP allows "thin" clients to connect to a Linux server where all programs are run, reducing hardware costs.
- The proposed setup includes an Edubuntu LTSP server with 20 Dell clients connected via a switch to access shared applications and services.
- Testing showed the server's CPU, RAM, disk and network usage increased predictably with additional users and applications like Firefox, OpenOffice and video playback.
This document discusses using Puppet for scalable systems management. It begins with challenges faced by system administrators and an introduction to Puppet. It covers installing and configuring Puppet, including certificate signing. It also discusses managing infrastructure with Puppet through classes, modules, and templates. Examples of Puppet configuration are provided.
This document discusses using Puppet for scalable systems management. It begins with challenges faced by system administrators and an introduction to Puppet. It covers installing and configuring Puppet, including certificate signing. It also discusses managing infrastructure with Puppet through classes, modules, and templates. Examples of Puppet configuration are provided.
Immutable infrastructure with Docker and containers (GlueCon 2015)Jérôme Petazzoni
"Never upgrade a server again. Never update your code. Instead, create new servers, and throw away the old ones!"
That's the idea of immutable servers, or immutable infrastructure. This makes many things easier: rollbacks (you can always bring back the old servers), A/B testing (put old and new servers side by side), security (use the latest and safest base system at each deploy), and more.
However, throwing in a bunch of new servers at each one-line CSS change is going to be complicated, not to mention costly.
Containers to the rescue! Creating container "golden images" is easy, fast, dare I say painless. Replacing your old containers with new ones is also easy to do; much easier than virtual machines, let alone physical ones.
In this talk, we'll quickly recap the pros (and cons) of immutable servers; then explain how to implement that pattern with containers. We will use Docker as an example, but the technique can easily be adapted to Rocket or even plain LXC containers.
Devoxx PL: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
Devoxx PL: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
DevoxxUK: Is your profiler speaking the same language as you?Simon Maple
Profilers are absolute beasts. And profilers might prove useful to pinpoint the performance issues in your Java applications.
By using profilers, developers are fortunate to find the root cause of an issue at hand. However, it requires effort to actually comprehend the data collected by the profiler. Due to the inherent complexity of the data, one has to understand how this data is collected. And thus understand how the profiler actually works.
During this talk we will go through the classic profiler features. What is a hotspot? What is the difference between sampling and instrumentation from the profiler point of view? What are the problems with either of those methods? What is the time budget of the application? And more!
I will also showcase a new kid on the block among the profiling tools: XRebel. This tool provides insight into application behavior and permits the developers to discover application level issues
Advanced Level Training on Koha / TLS (ToT)Ata Rehman
Advanced Level Training on Koha / Total Library Solution - TLS - (ToT), December 4-8, 2017 – PASTIC, Islamabad
All training material provided during this training can be found at: https://drive.google.com/drive/folders/1hwWGHV1iHgcpjK_tw6-Xgf-ZVUPchIS_
This document provides an overview of Mercurial, a distributed version control system. It discusses pros and cons of Mercurial compared to other version control systems like Subversion and Git. Key aspects covered include how Mercurial works with local repositories and working copies, inter-repository communication through commands like clone, pull and push. It also discusses features like tags, branches, handling large files, and workflows used at the author's game development company.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Dr. Sean Tan, Head of Data Science, Changi Airport Group
Discover how Changi Airport Group (CAG) leverages graph technologies and generative AI to revolutionize their search capabilities. This session delves into the unique search needs of CAG’s diverse passengers and customers, showcasing how graph data structures enhance the accuracy and relevance of AI-generated search results, mitigating the risk of “hallucinations” and improving the overall customer journey.
“An Outlook of the Ongoing and Future Relationship between Blockchain Technologies and Process-aware Information Systems.” Invited talk at the joint workshop on Blockchain for Information Systems (BC4IS) and Blockchain for Trusted Data Sharing (B4TDS), co-located with with the 36th International Conference on Advanced Information Systems Engineering (CAiSE), 3 June 2024, Limassol, Cyprus.
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
Maruthi Prithivirajan, Head of ASEAN & IN Solution Architecture, Neo4j
Get an inside look at the latest Neo4j innovations that enable relationship-driven intelligence at scale. Learn more about the newest cloud integrations and product enhancements that make Neo4j an essential choice for developers building apps with interconnected data and generative AI.
Building RAG with self-deployed Milvus vector database and Snowpark Container...Zilliz
This talk will give hands-on advice on building RAG applications with an open-source Milvus database deployed as a docker container. We will also introduce the integration of Milvus with Snowpark Container Services.
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
Enchancing adoption of Open Source Libraries. A case study on Albumentations.AIVladimir Iglovikov, Ph.D.
Presented by Vladimir Iglovikov:
- https://www.linkedin.com/in/iglovikov/
- https://x.com/viglovikov
- https://www.instagram.com/ternaus/
This presentation delves into the journey of Albumentations.ai, a highly successful open-source library for data augmentation.
Created out of a necessity for superior performance in Kaggle competitions, Albumentations has grown to become a widely used tool among data scientists and machine learning practitioners.
This case study covers various aspects, including:
People: The contributors and community that have supported Albumentations.
Metrics: The success indicators such as downloads, daily active users, GitHub stars, and financial contributions.
Challenges: The hurdles in monetizing open-source projects and measuring user engagement.
Development Practices: Best practices for creating, maintaining, and scaling open-source libraries, including code hygiene, CI/CD, and fast iteration.
Community Building: Strategies for making adoption easy, iterating quickly, and fostering a vibrant, engaged community.
Marketing: Both online and offline marketing tactics, focusing on real, impactful interactions and collaborations.
Mental Health: Maintaining balance and not feeling pressured by user demands.
Key insights include the importance of automation, making the adoption process seamless, and leveraging offline interactions for marketing. The presentation also emphasizes the need for continuous small improvements and building a friendly, inclusive community that contributes to the project's growth.
Vladimir Iglovikov brings his extensive experience as a Kaggle Grandmaster, ex-Staff ML Engineer at Lyft, sharing valuable lessons and practical advice for anyone looking to enhance the adoption of their open-source projects.
Explore more about Albumentations and join the community at:
GitHub: https://github.com/albumentations-team/albumentations
Website: https://albumentations.ai/
LinkedIn: https://www.linkedin.com/company/100504475
Twitter: https://x.com/albumentations
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024Neo4j
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
1. Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)
RHCE - Administration Program
LINUX Syllabus
Duration: 80Hours / 20 Classes (4hrs each class Including Theory & Lab
Session) (2 Classes/ Week)
Class Topic Duration
Class 1 History of Linux (GNU/LINUX) 10min
GNU General Public License 5min
H/D Geometry 30min
Basic Requirement for Linux Installation 15min
Installation – Minimal and Custom 1hrs 30min
Assessment – 3 1hrs 30min
Class 2 Linux Commands – Part I 2hrs
Pwd/cd/ls/who/whoami/who am i/which/cp/mv/rm/mkdir/
touch/hostname/cat/cal/eject/mount/umount/login/logout
/echo/wget
VI Editor 30min
Assessment – 1 1hrs 30min
Class 3 Linux Commands – Part II 3hrs
Halt/shutdown/poweroff/reboot/ll/dd/joe/emacs/ln/fdisk/
mke2fs/mtools/pico/sed/wc/whereis/convert/ifconfig/ncftp/
scp/hdparm/dmesg/bc/sh/at/atq/trm/date/uptime/su
/switchdesk/uname
Assessment – 2 1hrs
Class 4 Binary/Process/Daemon 20min
File System Hierarchy Standard 40min
Details FSTAB 1hrs
Archiving/Encoding/Compressing/Encrypting File 30min
Compress/Uncompress/tar/bzip2/bunzip2/gzip/gunzip/zip
Process and Job Control 30min
Ps/nice/renice/top/nohup/kill/killall/bg/fg/jobs
Assessment – 4 1hrs
Class 5 Symbolic Link / Hard Link 30min
Comparison between Both Links 10min
Advance Linux Commands 1hrs 20min
useradd/userdel/usermod/groupadd/groupmod/groupdel
passwd/id/uname/chown/chgrp/chmod/chroot
File manipulation commands 1hrs
Head/tail/less/more/grep/find/awk/comm./diff/join
Assessment – 5 1hrs
Class 6 Shell Scripting 1hrs 30min
Boot Process Part 1 1hrs 30min
Assessment – 6 1hrs
Class 7 Boot Process Part 2 2hrs 30min
Assessment – 7 1hrs 30min
Class 8 User and Group Administration – Useradd Details 1hrs
File & Directory Permission & Security 1hrs
Chmod/chgrp/SetUid/SetGid/StickyBit/umask 30min
SUDO 30min
Assessment – 8 1hrs
Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)
2. Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)
Class 9 Software Installation 2hrs 30min
With RPM / With Source Code (Tar Ball)
X-Windows 1hrs
Assessment – 9 30min
Class 10 User and Group Quota Management 1hrs
Cron and Anacron 1hrs
Autofs/Syslog Administration 1hrs
Assessment – 10 1hrs
Class 11 Linux Kernel 1hrs
Building Custom Kernel using CUI and GUI/Kernel Patching 1hrs 30min
Assessment – 11 1hrs 30min
Class 12 Some Advanced Commands 1hrs
Df/Du/Fdformat/Eelabel/Dumpe2fs/Tune2fs/Chroot/Sync/
Mkswap/Swapon/E2fsck/ifdisk
LVM (Logical Volume Manager) / LVM with RAID 2hrs
Assessment – 12 1hrs
Class 13 IP Addressing – Basic 30min
IP Address Configuration for Linux Boxes 15min
Sub netting, bonding, Configure NIC with Multiple IP 30min
Using Different Utility - ping/tcpdump/netstat/nmap 15min
DHCP Server Configuration 1hrs
SAMBA 1hrs
Assessment – 13 30min
Class 14 VSFTPD 1hrs
XINETD – TCPWRAPPER 30min
OpenSSH 1hrs 30min
Assessment – 14 1hrs
Class 15 Apache 3hrs
Basic Configuration/ Virtual Hosting/ Authentication
Content Description and Modification
Indexing /Redirection/ Logging/ Proxying
Security – Using OpenSSL.
Integration and Testing of PHP Module
Integration and Testing of Perl Module
Modular and Static Installation of Apache from Source Code.
Integration of Tomcat with Apache
Apache Failover/ HA with Hearbeat Software
Assessment – 15 1hrs
Class 16 NFS 1hrs 30min
Why NFS?
Server Side NFS Configuration
Client Side NFS Configuration
Automation of NFS Server and Client.
Logging/Security/Failover High Availability of NFS Servers.
NIS 1hrs 30min
Why NIS?
NIS Server Configuration
NIS Client Configuration
Testing from the Clients
Host.conf and nsswitch.conf
Advantage of NIS/Automation/Security.
Assessment – 16 1hrs
Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)
3. Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)
Class 17 IPTables 1hrs 30min
Build internet firewall based on stateless and stateful firewall
All Kind of Network address and port translation
NAT to implement transparent Proxy
Iptables integration with Linux router, implementing Default,
Static and Dynamic Routers and VPN Support
Assessment – 17 1hrs
Class 18 Squid 2hrs 30min
Introduction to SQUID/ CLI Options
Network Parameters/ Admin Parameters
Caching/ Access Control List
Authentication/ Logging
Transparent Proxy
Reverse Proxy
DNS Mapping
Squid Guard 30min
SquidGuard is a URL redirector used to use blacklists with
the proxy software Squid. There are two big advantages to
squidguard: it is fast and it is free. SquidGuard is published
under GNU Public License.
Assessment – 18 1hrs
Class 19 DNS/DNS Restriction and ACL implementation/Dynamic DNS 1hrs 30min
Mail – Sendmail 2hrs
SquirrelMail
SquirrelMail is a standards-based webmail package written in
PHP. It includes built-in pure PHP support for the IMAP and
SMTP protocols, and all pages render in pure HTML 4.0 (with
no JavaScript required) for maximum compatibility across
browsers. It has very few requirements and is very easy to
configure and install. SquirrelMail has all the functionality
you would want from an email client, including strong MIME
support, address books, and folder manipulation.
Assessment – 19 30min
Class 20 MySQL 3hrs
Introduction to RDBMS
Installation of MySQL
MySQL Architecture
Creation of Database
Simple SQL Statements
Backup and Restore
Assessment -21 1hrs
Semaphore Technologies Pvt. Ltd. – (technologies.semaphore@gmail.com)