The document provides details from the burning of an audio CD using Nero software. It includes information about the hardware and software used, the audio files being burned, and a log of the burning process. The audio CD contains 10 tracks with a total runtime of 54 minutes and contains .wav files. The burning process uses disc-at-once mode on a HL-DT-ST DVD burner and proceeds without issues according to the log.
This document contains the log of a DVD copying process using Nero software. It summarizes:
1. The software is Nero version 7.5.13.1 and is copying from a DVD-R disc onto an image file.
2. The drive being used is a TSSTcorp CDDVDW SH-S223F and information is provided on the source disc, recorder, and system configuration.
3. The process proceeds through reading track information from the source, setting up the image file, verifying disc positions, and creating the image successfully in the first step. It then prepares to burn the image in the second step.
The document provides details from the log of an audio CD burning session in Nero, including:
- A list of 10 tracks being burned with titles, lengths, and file names
- The recorder being used is a MATSHITA DVD-RAM UJ8E1
- The burning begins in disc-at-once mode and provides status updates throughout the process
Tensorflow and python : fault detection system - PyCon Taiwan 2017Eric Ahn
This document summarizes Eric Ahn's presentation on using Tensorflow and Python for fault detection from system logs. Ahn discusses how convolutional neural networks (CNNs) can be applied to analyze log data and detect faults. He provides an example of applying CNNs to a system log, demonstrating how the log entries would be convolved to extract features and classify the entries as indicating either a normal or fault condition in 3 or fewer sentences.
1. The document provides instructions for creating a isolated network in Neutron, including creating a network, subnet, router, and attaching the subnet to the router.
2. It then shows how to assign a public IP to the isolated network by setting the router gateway to an external network.
3. Finally, it demonstrates deleting the isolated network resources, including removing the router gateway, detaching the subnet, deleting the router, and deleting the network.
The document summarizes the log of an attempted audio CD burning session in Nero. It lists the system configuration, inserted disc details, audio track listings, and provides a play-by-play of the burning process. The burn was aborted due to insufficient free space on the CD-R disc.
This document contains chat logs from a DotA gaming public league room. Various users are signing up for games, requesting stats on players, and discussing which games are currently running. However, one user named Nickrei3 is repeatedly spamming random letters and symbols, despite being asked to stop by another user. Moderation of the chat to prevent spamming is needed.
This document discusses sector, track, and cylinder alignment of partitions, file systems, and logical volume management on hard disks. Proper alignment improves performance by minimizing the number of physical blocks that need to be read from or written to disk when accessing virtual blocks. The examples show how to use fdisk and sfdisk to create partitions aligned on 512KB boundaries, as well as how LVM and file systems like EXT4 can be aligned. RAID configurations also benefit from aligned components.
The document summarizes an analysis of compromised Linux servers. The author detected intrusion after logging in and seeing a previous login from an Italian IP address. Further investigation revealed unauthorized login attempts from other countries. Logs showed the intruder accessed the servers repeatedly over weeks. Processes and open ports indicated the presence of rootkits and backdoors. User accounts for the intruder were also found on the servers.
This document contains the log of a DVD copying process using Nero software. It summarizes:
1. The software is Nero version 7.5.13.1 and is copying from a DVD-R disc onto an image file.
2. The drive being used is a TSSTcorp CDDVDW SH-S223F and information is provided on the source disc, recorder, and system configuration.
3. The process proceeds through reading track information from the source, setting up the image file, verifying disc positions, and creating the image successfully in the first step. It then prepares to burn the image in the second step.
The document provides details from the log of an audio CD burning session in Nero, including:
- A list of 10 tracks being burned with titles, lengths, and file names
- The recorder being used is a MATSHITA DVD-RAM UJ8E1
- The burning begins in disc-at-once mode and provides status updates throughout the process
Tensorflow and python : fault detection system - PyCon Taiwan 2017Eric Ahn
This document summarizes Eric Ahn's presentation on using Tensorflow and Python for fault detection from system logs. Ahn discusses how convolutional neural networks (CNNs) can be applied to analyze log data and detect faults. He provides an example of applying CNNs to a system log, demonstrating how the log entries would be convolved to extract features and classify the entries as indicating either a normal or fault condition in 3 or fewer sentences.
1. The document provides instructions for creating a isolated network in Neutron, including creating a network, subnet, router, and attaching the subnet to the router.
2. It then shows how to assign a public IP to the isolated network by setting the router gateway to an external network.
3. Finally, it demonstrates deleting the isolated network resources, including removing the router gateway, detaching the subnet, deleting the router, and deleting the network.
The document summarizes the log of an attempted audio CD burning session in Nero. It lists the system configuration, inserted disc details, audio track listings, and provides a play-by-play of the burning process. The burn was aborted due to insufficient free space on the CD-R disc.
This document contains chat logs from a DotA gaming public league room. Various users are signing up for games, requesting stats on players, and discussing which games are currently running. However, one user named Nickrei3 is repeatedly spamming random letters and symbols, despite being asked to stop by another user. Moderation of the chat to prevent spamming is needed.
This document discusses sector, track, and cylinder alignment of partitions, file systems, and logical volume management on hard disks. Proper alignment improves performance by minimizing the number of physical blocks that need to be read from or written to disk when accessing virtual blocks. The examples show how to use fdisk and sfdisk to create partitions aligned on 512KB boundaries, as well as how LVM and file systems like EXT4 can be aligned. RAID configurations also benefit from aligned components.
The document summarizes an analysis of compromised Linux servers. The author detected intrusion after logging in and seeing a previous login from an Italian IP address. Further investigation revealed unauthorized login attempts from other countries. Logs showed the intruder accessed the servers repeatedly over weeks. Processes and open ports indicated the presence of rootkits and backdoors. User accounts for the intruder were also found on the servers.
The document contains log output from the StarBurn Development Kit software. It logs the startup of the software and detection of an optical drive located at address F:. It retrieves identification and capabilities information about the drive, which is identified as a DTSOFT BDROM drive. It also records some warnings encountered during initialization and device probing.
The log file documents the start of an executable used to update firmware on July 13, 2012. It records the process of connecting to a device on COM3 port, identifying the device model as an LGE612F, downloading firmware binaries including boot and AMSS partitions, and writing the updates to NAND flash in an optimized asynchronous manner over 44 packets. The updates were completed successfully.
The document contains log output from the StarBurn Development Kit software. It lists the software version and license information, and then outputs details about detected optical drives, including device IDs, supported media formats, and status information. The software appears to be initializing and probing the capabilities of two optical drives, located at addresses 0:1:0:0 and 255:255:255:0.
The document describes the steps someone took to install Grunt and the Grunt uglify plugin using NPM on their computer. It shows them running grunt.loadNpmTasks to load the uglify plugin, then running the grunt uglify task which minifies their scripts but fails the first time as their source files are empty, then succeeds on the second try after files have been added.
1 million serial numbers of different softwaresmifdov
This document contains a list of software titles along with their corresponding license keys, serial numbers, usernames, and passwords. There are over 200 entries listing various applications, games, utilities and more. Each entry typically includes the software name, version, and a serial number, license key, username or other authentication information.
This document contains a list of software serial numbers and registration information. It includes serial numbers for products like Microsoft Office, Windows, Partition Magic, Pinnacle Studio, Norton Antivirus, and more. The serial numbers are attributed to various individuals and organizations.
The computer forensics report summarizes the investigation of a suspected machine's hard drive (HDD) and random access memory (RAM). Two deleted files were recovered from the HDD, which appeared to be course files. The operating system detected from analyzing the RAM was determined to be either Windows 7 or Windows Server 2008. Various running processes and network connections were extracted, including evidence of iexplore and notepad instances.
This document contains a list of software serial numbers and license keys. It includes serial numbers for operating systems like Windows 95, Windows 98, and Windows XP. It also includes serial numbers and license keys for various software programs like Microsoft Office, Adobe Photoshop, Macromedia Dreamweaver, and more. In total, there are serial numbers and license keys for over 50 different software programs listed.
This document lists dedicated server options in Japan from a hosting provider. Sixteen server configurations are offered with varying processors, RAM, storage, and prices. Options include Intel Xeon, Core, and Celeron processors with RAM from 4GB to 64GB. Hard drives include SSD and HDD from 120GB to 2TB. Locations are in Sapporo, Tokyo, and Nagano. Benefits of choosing this provider include an additional IP, server management options, money-back guarantee, and Bitcoin payment.
21st Athens Big Data Meetup - 3rd Talk - Dive into ClickHouse query executionAthens Big Data
This document discusses how ClickHouse processes and summarizes data. It describes ClickHouse's column-oriented data layout and how it stores and compresses data at the column level. It also discusses how ClickHouse processes and transforms data in memory through techniques like delta encoding, and how it parallelizes query execution through pipelining. Finally, it outlines how ClickHouse uses specialized data structures and algorithms tailored to different data types and operations to optimize performance.
This document contains a system report for a Windows XP computer. It details the machine name, operating system, processor, memory, graphics card, sound devices, and other hardware. It also includes information on drivers, DirectX, and other software. In total, the report contains over 50 sections profiling the configuration and status of the system.
The document describes the initialization phase of an IMPORT job in Sqoop 2. It shows that the SqoopInputFormat gets splits from the database, which are then passed to the Partitioner to determine how to partition the data among mapper tasks. This establishes the basic workflow of reading data from the source and partitioning it for import into HDFS.
- The Spark Cassandra Connector allows reading Cassandra data into Spark RDDs and writing Spark RDDs back to Cassandra tables.
- When reading, it partitions RDDs by Cassandra token ranges to co-locate partitions with node data. When writing, it batches writes by partition key to minimize requests.
- This allows efficient distributed processing of Cassandra data using Spark's parallelism while minimizing network usage through co-location of data and tasks.
The document appears to be log output from the NeroVision software. It records the startup process and initialization of various components, including checking licenses, detecting hardware, loading profiles and templates. Audio and video devices are detected and filters are connected to begin processing a sample media file.
Watching And Manipulating Your Network TrafficJosiah Ritchie
This is an intro presentation to using the powerful tools for provided for linux in the area of networking. These are command line only tools because in a good network firewall, you won't have the option of graphical tools.
How to create a pluggable database by cloning an existing local pdbMarco Vigelini
The document describes how to clone an existing pluggable database (PDB) in an Oracle multitenant container database (CDB) to create a new PDB. It involves opening the source PDB in read-only mode, running the CREATE PLUGGABLE DATABASE command specifying the source and target file paths, and then opening the new PDB. The process is demonstrated by cloning an existing local PDB called PDB001 to create a new PDB called PDB003, copying over the user, tables, and data.
The document appears to contain log entries from a Windows setup process. It records the start and end times of various setup sections as they are initialized, such as installing Windows, common initialization, initializing the wizard, and configuring network and regional settings. The log shows the sequence and duration of each step in the setup process.
This document provides an overview of the UNIX operating system. It begins with information about the lecture and preparation of materials. It then discusses the history of UNIX and differences between various UNIX variants such as AIX, FreeBSD, HP-UX, Linux, Solaris, and Tru64. It also covers the UNIX directory structure and userland components such as logging in, commands, and treating all system resources as files. The document promotes the UNIX philosophy of small, modular programs and using text files and pipes for communication.
Plongée profonde dans les technos de haute disponibilité d’Exchange 2010 par...Microsoft Technet France
Vous aussi, devenez incollable sur la Haute Dispo d’Exchange ! Session technique, en Anglais, faite par le gourou des technos de haute disponibilité d’Exchange : Scott Schnoll. Scott est speaker aux TechReady et TechEd de Microsoft, a écrit de nombreux livres de référence, et il sera présent en exclusivité pour animer cette session. Parmi les thèmes abordés : Comment séparer mon flux de réplication des logs de mon flux client ? quand un DAG (Database Availability Group) tombe, comment le système choisit-il la bonne copie de la base de données à répliquer ? Allez au-delà des fonctions de base de la haute disponibilité et apprenez ce qui se passe réellement dans les arcanes d’un DAG Exchange. Cette session couvre le fonctionnement interne des DAGs, nous discuterons des réseaux de DAGs, d’Active Manager, de comment le système permet la sélection des meilleures réplications de bases et du Datacenter Activation Coordination Mode.
Fighting inflation in a dollarized economy the case of vietnamPhan Phuong
This document summarizes a journal article about fighting inflation in Vietnam during its transition to a market economy in the 1990s. The key points are:
1) Vietnam used dollarization and exchange rate management to successfully reduce inflation from over 350% in 1988 to under 10% in the 1990s.
2) A model is developed showing that inflation in Vietnam was driven by excess money supply and exchange rate fluctuations.
3) Empirical analysis estimates that a 25% depreciation of the Vietnamese currency in 1997-1998 led to an additional cumulative inflation of 13% over that period.
The document contains log output from the StarBurn Development Kit software. It logs the startup of the software and detection of an optical drive located at address F:. It retrieves identification and capabilities information about the drive, which is identified as a DTSOFT BDROM drive. It also records some warnings encountered during initialization and device probing.
The log file documents the start of an executable used to update firmware on July 13, 2012. It records the process of connecting to a device on COM3 port, identifying the device model as an LGE612F, downloading firmware binaries including boot and AMSS partitions, and writing the updates to NAND flash in an optimized asynchronous manner over 44 packets. The updates were completed successfully.
The document contains log output from the StarBurn Development Kit software. It lists the software version and license information, and then outputs details about detected optical drives, including device IDs, supported media formats, and status information. The software appears to be initializing and probing the capabilities of two optical drives, located at addresses 0:1:0:0 and 255:255:255:0.
The document describes the steps someone took to install Grunt and the Grunt uglify plugin using NPM on their computer. It shows them running grunt.loadNpmTasks to load the uglify plugin, then running the grunt uglify task which minifies their scripts but fails the first time as their source files are empty, then succeeds on the second try after files have been added.
1 million serial numbers of different softwaresmifdov
This document contains a list of software titles along with their corresponding license keys, serial numbers, usernames, and passwords. There are over 200 entries listing various applications, games, utilities and more. Each entry typically includes the software name, version, and a serial number, license key, username or other authentication information.
This document contains a list of software serial numbers and registration information. It includes serial numbers for products like Microsoft Office, Windows, Partition Magic, Pinnacle Studio, Norton Antivirus, and more. The serial numbers are attributed to various individuals and organizations.
The computer forensics report summarizes the investigation of a suspected machine's hard drive (HDD) and random access memory (RAM). Two deleted files were recovered from the HDD, which appeared to be course files. The operating system detected from analyzing the RAM was determined to be either Windows 7 or Windows Server 2008. Various running processes and network connections were extracted, including evidence of iexplore and notepad instances.
This document contains a list of software serial numbers and license keys. It includes serial numbers for operating systems like Windows 95, Windows 98, and Windows XP. It also includes serial numbers and license keys for various software programs like Microsoft Office, Adobe Photoshop, Macromedia Dreamweaver, and more. In total, there are serial numbers and license keys for over 50 different software programs listed.
This document lists dedicated server options in Japan from a hosting provider. Sixteen server configurations are offered with varying processors, RAM, storage, and prices. Options include Intel Xeon, Core, and Celeron processors with RAM from 4GB to 64GB. Hard drives include SSD and HDD from 120GB to 2TB. Locations are in Sapporo, Tokyo, and Nagano. Benefits of choosing this provider include an additional IP, server management options, money-back guarantee, and Bitcoin payment.
21st Athens Big Data Meetup - 3rd Talk - Dive into ClickHouse query executionAthens Big Data
This document discusses how ClickHouse processes and summarizes data. It describes ClickHouse's column-oriented data layout and how it stores and compresses data at the column level. It also discusses how ClickHouse processes and transforms data in memory through techniques like delta encoding, and how it parallelizes query execution through pipelining. Finally, it outlines how ClickHouse uses specialized data structures and algorithms tailored to different data types and operations to optimize performance.
This document contains a system report for a Windows XP computer. It details the machine name, operating system, processor, memory, graphics card, sound devices, and other hardware. It also includes information on drivers, DirectX, and other software. In total, the report contains over 50 sections profiling the configuration and status of the system.
The document describes the initialization phase of an IMPORT job in Sqoop 2. It shows that the SqoopInputFormat gets splits from the database, which are then passed to the Partitioner to determine how to partition the data among mapper tasks. This establishes the basic workflow of reading data from the source and partitioning it for import into HDFS.
- The Spark Cassandra Connector allows reading Cassandra data into Spark RDDs and writing Spark RDDs back to Cassandra tables.
- When reading, it partitions RDDs by Cassandra token ranges to co-locate partitions with node data. When writing, it batches writes by partition key to minimize requests.
- This allows efficient distributed processing of Cassandra data using Spark's parallelism while minimizing network usage through co-location of data and tasks.
The document appears to be log output from the NeroVision software. It records the startup process and initialization of various components, including checking licenses, detecting hardware, loading profiles and templates. Audio and video devices are detected and filters are connected to begin processing a sample media file.
Watching And Manipulating Your Network TrafficJosiah Ritchie
This is an intro presentation to using the powerful tools for provided for linux in the area of networking. These are command line only tools because in a good network firewall, you won't have the option of graphical tools.
How to create a pluggable database by cloning an existing local pdbMarco Vigelini
The document describes how to clone an existing pluggable database (PDB) in an Oracle multitenant container database (CDB) to create a new PDB. It involves opening the source PDB in read-only mode, running the CREATE PLUGGABLE DATABASE command specifying the source and target file paths, and then opening the new PDB. The process is demonstrated by cloning an existing local PDB called PDB001 to create a new PDB called PDB003, copying over the user, tables, and data.
The document appears to contain log entries from a Windows setup process. It records the start and end times of various setup sections as they are initialized, such as installing Windows, common initialization, initializing the wizard, and configuring network and regional settings. The log shows the sequence and duration of each step in the setup process.
This document provides an overview of the UNIX operating system. It begins with information about the lecture and preparation of materials. It then discusses the history of UNIX and differences between various UNIX variants such as AIX, FreeBSD, HP-UX, Linux, Solaris, and Tru64. It also covers the UNIX directory structure and userland components such as logging in, commands, and treating all system resources as files. The document promotes the UNIX philosophy of small, modular programs and using text files and pipes for communication.
Plongée profonde dans les technos de haute disponibilité d’Exchange 2010 par...Microsoft Technet France
Vous aussi, devenez incollable sur la Haute Dispo d’Exchange ! Session technique, en Anglais, faite par le gourou des technos de haute disponibilité d’Exchange : Scott Schnoll. Scott est speaker aux TechReady et TechEd de Microsoft, a écrit de nombreux livres de référence, et il sera présent en exclusivité pour animer cette session. Parmi les thèmes abordés : Comment séparer mon flux de réplication des logs de mon flux client ? quand un DAG (Database Availability Group) tombe, comment le système choisit-il la bonne copie de la base de données à répliquer ? Allez au-delà des fonctions de base de la haute disponibilité et apprenez ce qui se passe réellement dans les arcanes d’un DAG Exchange. Cette session couvre le fonctionnement interne des DAGs, nous discuterons des réseaux de DAGs, d’Active Manager, de comment le système permet la sélection des meilleures réplications de bases et du Datacenter Activation Coordination Mode.
Fighting inflation in a dollarized economy the case of vietnamPhan Phuong
This document summarizes a journal article about fighting inflation in Vietnam during its transition to a market economy in the 1990s. The key points are:
1) Vietnam used dollarization and exchange rate management to successfully reduce inflation from over 350% in 1988 to under 10% in the 1990s.
2) A model is developed showing that inflation in Vietnam was driven by excess money supply and exchange rate fluctuations.
3) Empirical analysis estimates that a 25% depreciation of the Vietnamese currency in 1997-1998 led to an additional cumulative inflation of 13% over that period.
The document is a log from a Nero burning session that was aborted by the user. It summarizes the steps taken to create an image file from an audio CD, and was in the process of burning that image to a disc when it was canceled. The software analyzed the source disc, configured burn settings for disc-at-once mode, cached the disc contents to an image file, and was preparing to start the burn when the user aborted it after being prompted to insert a blank disc.
This document summarizes the steps taken to copy a CD to an image file and then burn that image file to a new CD. It analyzed the original CD, copied the audio tracks and data to an image file, and prepared the burner and blank disc to write the image in disc-at-once mode. However, the process was aborted by the user before the image could be burned to the new disc.
The document describes the process of copying a CD to an image file and then burning the image file to a new CD. During the copying process, a read error was encountered but ignored. When attempting to burn the image file, the recorder returned a "not ready" error multiple times.
This summary provides the key details from the log in 3 sentences:
The log documents the process of copying an audio CD to an image file and then burning that image to a disc. It records the creation of the image file and preparation for burning. However, the burning process was aborted by the user as no disc was present in the drive.
The document summarizes the burning of an audio file to a DVD using Nero burning software. It lists the hardware and software used, provides details of the burning settings and process, and logs the progress and completion of caching the file, starting the burn, and confirming the successful completion of the burn at 24x speed.
The document appears to be log output from a disc copying process in Nero software. It summarizes:
1) The process attempted to copy an audio CD but encountered multiple unrecoverable read errors from the source disc.
2) Read errors started occurring at track positions 09:55.15 through 12:03.49.
3) Due to the numerous read errors, the disc copying process was unable to complete.
This document summarizes a burn attempt using Nero to write an image file to DVD media. The burn was started using Disc-at-Once mode on DVD media but was aborted by the user after the recorder preparation and setup were completed. The log provides details on the software and hardware configuration, the image file being written, and playbacks the activities up until the user aborted the burn process.
This document contains log information from an attempt to burn an audio CD using Nero software. It lists the audio tracks to be burned totaling 79 minutes and 8 seconds. It then shows the burning process start but get aborted by the user. It identifies the recorder as a TSSTcorp CDDVDW drive and shows it failed to read the CD type. The logs show the software closing out the burning process since it was aborted.
The document contains log entries from Nero burning software. It lists the software and hardware versions used, details about the burning process such as settings and tracks, and indicates that the burn was aborted by the user due to insufficient free space on the disc.
1. The document describes the burning of an ISO image file to a DVD using Nero burning software. It lists the hardware, software versions, burn settings and progress of the burning process.
2. The burn was started at 48x speed to the HL-DT-ST DVDRAM GH24NS95 DVD drive. Files were cached and then the burning process began and completed successfully.
3. Information about the burning process such as caching, writing lead-in/lead-out, and burn completion is reported.
This document summarizes the log of a burning process using Nero burning software. It lists the hardware used, burning settings, and provides a play-by-play of the process which included caching files, burning at 48x speed, verifying the data, and ejecting the disc. The process completed successfully in under 30 minutes.
The system report summarizes the hardware and software configuration of a Windows XP system. It includes details about the processor, memory, graphics card, sound devices, and installed drivers. A Nvidia GeForce 9400 GT graphics card and Realtek audio devices are listed. The system has 2 GB of RAM and is running Windows XP SP3 in Spanish.
This document summarizes the settings and log of an aborted CD burning attempt in Nero. It provides details of the burning mode, ISO settings, drive information, and burning protocol before it was aborted by the user when choosing the image file to burn. The summary includes the writing mode, ISO level, and point at which the user aborted the burning process.
This document summarizes the results of an attempted CD/DVD burn using Nero burning software. The burn was aborted by the user after Nero determined there was not enough free space on the DVD-R disc to write the 6.688 MB of data. Nero provided details of the drive, software version, burn settings, and activities taken during the attempted burn process.
The document provides diagnostic information from a system error on an application. Key details include:
- The error number is 10100 and the message is "Invalid switch: 2".
- System information includes the version, OS, and invalid command line argument.
- Diagnostic information is provided for various system components including memory allocation, disk drives, file systems, and PCI devices/interrupts.
Kernel Recipes 2017 - Performance analysis Superpowers with Linux BPF - Brend...Anne Nicolas
The in-kernel Berkeley Packet Filter (BPF) has been enhanced in recent kernels to do much more than just filtering packets. It can now run user-defined programs on events, such as on tracepoints, kprobes, uprobes, and perf_events, allowing advanced performance analysis tools to be created. These can be used in production as the BPF virtual machine is sandboxed and will reject unsafe code, and are already in use at Netflix.
Beginning with the bpf() syscall in 3.18, enhancements have been added in many kernel versions since, with major features for BPF analysis landing in Linux 4.1, 4.4, 4.7, and 4.9. Specific capabilities these provide include custom in-kernel summaries of metrics, custom latency measurements, and frequency counting kernel and user stack traces on events. One interesting case involves saving stack traces on wake up events, and associating them with the blocked stack trace: so that we can see the blocking stack trace and the waker together, merged in kernel by a BPF program (that particular example is in the kernel as samples/bpf/offwaketime).
This talk will discuss the new BPF capabilities for performance analysis and debugging, and demonstrate the new open source tools that have been developed to use it, many of which are in the Linux Foundation iovisor bcc (BPF Compiler Collection) project. These include tools to analyze the CPU scheduler, TCP performance, file system performance, block I/O, and more.
Brendan Gregg, Netflix
Kernel Recipes 2017: Performance Analysis with BPFBrendan Gregg
Talk by Brendan Gregg at Kernel Recipes 2017 (Paris): "The in-kernel Berkeley Packet Filter (BPF) has been enhanced in recent kernels to do much more than just filtering packets. It can now run user-defined programs on events, such as on tracepoints, kprobes, uprobes, and perf_events, allowing advanced performance analysis tools to be created. These can be used in production as the BPF virtual machine is sandboxed and will reject unsafe code, and are already in use at Netflix.
Beginning with the bpf() syscall in 3.18, enhancements have been added in many kernel versions since, with major features for BPF analysis landing in Linux 4.1, 4.4, 4.7, and 4.9. Specific capabilities these provide include custom in-kernel summaries of metrics, custom latency measurements, and frequency counting kernel and user stack traces on events. One interesting case involves saving stack traces on wake up events, and associating them with the blocked stack trace: so that we can see the blocking stack trace and the waker together, merged in kernel by a BPF program (that particular example is in the kernel as samples/bpf/offwaketime).
This talk will discuss the new BPF capabilities for performance analysis and debugging, and demonstrate the new open source tools that have been developed to use it, many of which are in the Linux Foundation iovisor bcc (BPF Compiler Collection) project. These include tools to analyze the CPU scheduler, TCP performance, file system performance, block I/O, and more."
This document contains system information for a Windows 7 computer with an Intel Core i7 processor and ATI Radeon HD 5800 Series graphics card, including operating system details, hardware specifications, display configuration, and driver information.
This document summarizes the log of a failed attempt to burn an ISO file to a DVD disc. It records information about the computer system, burning software version, connected DVD drive and disc, and burn attempt process. The burn was aborted by the user because the disc did not have enough free space to hold the entire ISO file contents, which was larger than the disc capacity.
This document contains system information for a Toshiba Satellite A300 laptop running Windows 7 including:
- Details on the operating system, hardware specifications, drivers, and devices
- A listing of components like the processor, memory, graphics card, sound devices, and attached peripherals
- Notes on display functionality and capabilities of the integrated ATI Mobility Radeon HD 3400 graphics card
OSSNA 2017 Performance Analysis Superpowers with Linux BPFBrendan Gregg
Talk by Brendan Gregg for OSSNA 2017. "Advanced performance observability and debugging have arrived built into the Linux 4.x series, thanks to enhancements to Berkeley Packet Filter (BPF, or eBPF) and the repurposing of its sandboxed virtual machine to provide programmatic capabilities to system tracing. Netflix has been investigating its use for new observability tools, monitoring, security uses, and more. This talk will be a dive deep on these new tracing, observability, and debugging capabilities, which sooner or later will be available to everyone who uses Linux. Whether you’re doing analysis over an ssh session, or via a monitoring GUI, BPF can be used to provide an efficient, custom, and deep level of detail into system and application performance.
This talk will also demonstrate the new open source tools that have been developed, which make use of kernel- and user-level dynamic tracing (kprobes and uprobes), and kernel- and user-level static tracing (tracepoints). These tools provide new insights for file system and storage performance, CPU scheduler performance, TCP performance, and a whole lot more. This is a major turning point for Linux systems engineering, as custom advanced performance instrumentation can be used safely in production environments, powering a new generation of tools and visualizations."