JDK not so hidden treasures
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This document provides a summary of various Java tools for monitoring and troubleshooting Java applications including: - jps - Lists Java processes instead of using ps - jmap - Prints shared object memory maps instead of using pmap - jstack - Prints Java stack traces for a Java process instead of using a debugger - jstat - Monitors Java virtual machine statistics similar to monitoring tools like top
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JDK, the not so hidden treasures
There is a number of tools that are as part of a JDK installation.
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Taking and analysing memory dumps, stack traces of java processes running in a particular system, monitoring GC activity.. and more, command line as you would hope when accessing this well-protected machine in a data centre somewhere far.
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This document provides an overview of tools and techniques for analyzing Java heap dumps. It discusses how to generate heap dumps using Ctrl-Break, XX:+HeapDumpOnOutOfMemoryError, or jmap. Jmap can also provide heap summaries. JHat allows analyzing heap dumps visually. Eclipse MAT and JConsole can also analyze heap dumps. Jstack prints stack traces, and can detect deadlocks. Sample code shows how to generate heap dumps and cause deadlocks.
How to build your query engine in spark
An over-ambitious introduction to Spark programming, test and deployment. This slide tries to cover most core technologies and design patterns used in SpookyStuff, the fastest query engine for data collection/mashup from the deep web.
For more information please follow: https://github.com/tribbloid/spookystuff
A bug in PowerPoint used to cause transparent background color not being rendered properly. This has been fixed in a recent upload.
Java Performance Analysis on Linux with Flame Graphs
This document discusses using Linux perf_events (perf) profiling tools to analyze Java performance on Linux. It describes how perf can provide complete visibility into Java, JVM, GC and system code but that Java profilers have limitations. It presents the solution of using perf to collect mixed-mode flame graphs that include Java method names and symbols. It also discusses fixing issues with broken Java stacks and missing symbols on x86 architectures in perf profiles.
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The path to Repeatable Builds
The document summarizes the author's journey towards setting up repeatable builds, going through several episodes of experimenting with different solutions and configurations on Jenkins. Some attempts included using a developer desktop as the CI server initially, setting up Node VMs to handle increased builds, using Chef to configure Jenkins and backup configurations, and setting up 64 OSX VMs with VMWare to test mobile apps although OSX posed many quirks. The last episode described putting all production dependencies in one box which became difficult to manage over time.
Go, the one language to learn in 2014
This document provides an overview of the Go programming language. It highlights some of Go's key features like being fast, having no runtime dependencies, easy packaging and distribution of code, built-in concurrency with goroutines and channels, and a simple but powerful type system. It also provides examples of basic Go constructs like functions, maps, structs, interfaces, goroutines, channels, and web servers to illustrate how to write Go programs.
Cheffing a department
The document discusses using Chef to manage infrastructure for a new development team. It recommends keeping the Chef implementation simple, focusing on readability and versioning of code. It also stresses the importance of code reviews, testing changes, and gaining buy-in from developers by emphasizing simplicity and avoiding introducing yet another tool.
Continuous Delivery Antipatterns
This document contains the tweets from a presentation on continuous delivery antipatterns. It discusses various problems that can arise during continuous delivery like separate development and release teams, slow build environments, unstable code, and lack of version control. It provides recommendations for overcoming these issues such as automating infrastructure, implementing semantic versioning, integrating teams, and building environments that can function without internet. The overall message is that organizations should aim to release software more frequently by addressing common antipatterns.
Java 8: the good parts!
This document provides an overview of new features in Java 8, including lambda expressions, default methods, and streams. Key points include:
- Lambda expressions allow for functional-style programming and remove boilerplate when passing operations as arguments.
- Default methods allow adding new methods to interfaces without breaking existing implementations. This enables adding new default behavior to existing interfaces.
- Streams provide a functional-style way to process collections of objects, and are lazy evaluated for efficiency. Common stream operations like map, filter, and forEach are demonstrated.
Continuous Delivery
The document discusses the importance of continuous delivery through early and frequent deployment of software. It emphasizes that the goal should be to define "done" as deployed in production and provide repeatable feedback through automated deployment pipelines that build, test and deploy code changes continuously to reduce risk and get early user feedback. It highlights issues that can arise from manual, late or infrequent deployments and provides examples of how some companies implement continuous delivery.
Git
Git is a distributed, open source version control system that is fast, reliable, powerful and popular. It provides advantages over Subversion like cherry-picking, rebasing, and submodules. Git commits provide detailed information that can be exposed via APIs and plugins like the maven-git-commit-id-plugin. Tools exist to host and manage git repositories, including Gitweb for viewing repositories, Gitosis for basic access control, and Gerrit for online code reviews.
Continous delivery
The document discusses concepts and best practices for continuous delivery and deployment pipelines. It advocates for automating deployments, deploying code changes frequently through pipelines that include testing at each stage, and making all environments as similar to production as possible to catch issues early. Maintaining consistency through configuration management tools and deploying to test systems first are also emphasized.
Hbase jdd
HBase is an open-source, distributed, scalable BigTable-like database built on top of Hadoop that allows for the fast storage and retrieval of large amounts of structured and unstructured data across clusters. It provides a fault-tolerant way of storing large amounts of sparse data and supports real-time read/write access to this data. HBase organizes data into tables divided into rows and columns and is well-suited for applications that benefit from random, real-time read/write access to large datasets.
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Covers: Apple Intelligence, iOS18, macOS Sequoia, iPadOS, watchOS, visionOS, and Apple TV+.
Understandable dialogue on Apple TV+
On-device app controlling AI.
Access to ChatGPT with a guest appearance by Chief Data Thief Sam Altman!
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ppt on the brain chip neuralink.pptx
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Why Apache Kafka Clusters Are Like Galaxies (And Other Cosmic Kafka Quandarie...
Closing talk for the Performance Engineering track at Community Over Code EU (Bratislava, Slovakia, June 5 2024) https://eu.communityovercode.org/sessions/2024/why-apache-kafka-clusters-are-like-galaxies-and-other-cosmic-kafka-quandaries-explored/ Instaclustr (now part of NetApp) manages 100s of Apache Kafka clusters of many different sizes, for a variety of use cases and customers. For the last 7 years I’ve been focused outwardly on exploring Kafka application development challenges, but recently I decided to look inward and see what I could discover about the performance, scalability and resource characteristics of the Kafka clusters themselves. Using a suite of Performance Engineering techniques, I will reveal some surprising discoveries about cosmic Kafka mysteries in our data centres, related to: cluster sizes and distribution (using Zipf’s Law), horizontal vs. vertical scalability, and predicting Kafka performance using metrics, modelling and regression techniques. These insights are relevant to Kafka developers and operators.
一比一原版(USF毕业证)旧金山大学毕业证如何办理
USF硕士毕业证成绩单【微信95270640】一比一伪造旧金山大学文凭@假冒USF毕业证成绩单+Q微信95270640办理USF学位证书@仿造USF毕业文凭证书@购买旧金山大学毕业证成绩单USF真实使馆认证/真实留信认证回国人员证明
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二：真实使馆认证（留学人员回国证明）使馆存档
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国外毕业证学位证成绩单办理方法：
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教育部文凭学历认证认证的用途：
如果您计划在国内发展那么办理国内教育部认证是必不可少的。事业性用人单位如银行国企公务员在您应聘时都会需要您提供这个认证。其他私营 #外企企业无需提供！办理教育部认证所需资料众多且烦琐所有材料您都必须提供原件我们凭借丰富的经验帮您快速整合材料让您少走弯路。
实体公司专业为您服务如有需要请联系我: 微信95270640奈一次次令他失望山娃今年岁上五年级识得很多字从走出小屋开始山娃就知道父亲的家和工地共有一个很动听的名字——天河工地的底层空空荡荡很宽阔很凉爽在地上铺上报纸和水泥袋父亲和工人们中午全睡在地上地面坑坑洼洼山娃曾多次绊倒过也曾有长铁钉穿透凉鞋刺在脚板上但山娃不怕工地上也常有五六个从乡下来的小学生他们的父母亲也是高楼上的建筑工人小伙伴来自不同省份都操着带有浓重口音的普通话可不知为啥山娃不仅很快与他们熟识了
Kubernetes at Scale: Going Multi-Cluster with Istio
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TMU毕业证书精仿办理
多伦多都会大学毕业证成绩单(留信网认证)【176555708微信】不能毕业办理假文凭回国找工作
【多伦多都会大学毕业证成绩单仿制】（176555708微信☀️）伪造研究生学位证书TMU毕业证文凭,多伦多都会大学文凭证书学籍信息入库,多伦多都会大学学位证书留学高校学位证书补办
【TMU毕业证【微信176555708】多伦多都会大学文凭学历】【微信176555708】【多伦多都会大学文凭学历证书】【多伦多都会大学毕业证书与成绩单样本图片】毕业证书补办 Fake Degree做学费单【毕业证明信-推荐信】成绩单，录取通知书，Offer，在读证明，雅思托福成绩单，真实大使馆教育部认证，回国人员证明，留信网认证。网上存档永久可查！
WMF 2024 - Unlocking the Future of Data Powering Next-Gen AI with Vector Data...
Vector databases are transforming how we handle data, allowing us to search through text, images, and audio by converting them into vectors. Today, we'll dive into the basics of this exciting technology and discuss its potential to revolutionize our next-generation AI applications. We'll examine typical uses for these databases and the essential tools
developers need. Plus, we'll zoom in on the advanced capabilities of vector search and semantic caching in Java, showcasing these through a live demo with Redis libraries. Get ready to see how these powerful tools can change the game!
Measures in SQL (SIGMOD 2024, Santiago, Chile)
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
To define the evaluation semantics for measures, we introduce context-sensitive expressions (a way to evaluate multidimensional expressions that is consistent with existing SQL semantics), a concept called evaluation context, and several operations for setting and modifying the evaluation context.
A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
Photoshop Tutorial for Beginners (2024 Edition)
Photoshop Tutorial for Beginners (2024 Edition)
Explore the evolution of programming and software development and design in 2024. Discover emerging trends shaping the future of coding in our insightful analysis."
Here's an overview:Introduction: The Evolution of Programming and Software DevelopmentThe Rise of Artificial Intelligence and Machine Learning in CodingAdopting Low-Code and No-Code PlatformsQuantum Computing: Entering the Software Development MainstreamIntegration of DevOps with Machine Learning: MLOpsAdvancements in Cybersecurity PracticesThe Growth of Edge ComputingEmerging Programming Languages and FrameworksSoftware Development Ethics and AI RegulationSustainability in Software EngineeringThe Future Workforce: Remote and Distributed TeamsConclusion: Adapting to the Changing Software Development LandscapeIntroduction: The Evolution of Programming and Software Development
Photoshop Tutorial for Beginners (2024 Edition)Explore the evolution of programming and software development and design in 2024. Discover emerging trends shaping the future of coding in our insightful analysis."Here's an overview:Introduction: The Evolution of Programming and Software DevelopmentThe Rise of Artificial Intelligence and Machine Learning in CodingAdopting Low-Code and No-Code PlatformsQuantum Computing: Entering the Software Development MainstreamIntegration of DevOps with Machine Learning: MLOpsAdvancements in Cybersecurity PracticesThe Growth of Edge ComputingEmerging Programming Languages and FrameworksSoftware Development Ethics and AI RegulationSustainability in Software EngineeringThe Future Workforce: Remote and Distributed TeamsConclusion: Adapting to the Changing Software Development LandscapeIntroduction: The Evolution of Programming and Software Development
The importance of developing and designing programming in 2024
Programming design and development represents a vital step in keeping pace with technological advancements and meeting ever-changing market needs. This course is intended for anyone who wants to understand the fundamental importance of software development and design, whether you are a beginner or a professional seeking to update your knowledge.
Course objectives:
1. **Learn about the basics of software development:
- Understanding software development processes and tools.
- Identify the role of programmers and designers in software projects.
2. Understanding the software design process:
- Learn about the principles of good software design.
- Discussing common design patterns such as Object-Oriented Design.
3. The importance of user experience (UX) in modern software:
- Explore how user experience can improve software acceptance and usability.
- Tools and techniques to analyze and improve user experience.
4. Increase efficiency and productivity through modern development tools:
- Access to the latest programming tools and languages used in the industry.
- Study live examples of applications
一比一原版(sdsu毕业证书)圣地亚哥州立大学毕业证如何办理
原版一模一样【微信：741003700 】【(sdsu毕业证书)圣地亚哥州立大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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如果您处于以下几种情况：
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◇企事业单位必须要求办理的
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◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
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校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
What’s New in Odoo 17 – A Complete Roadmap
Odoo releases a new update every year. The latest version, Odoo 17, came out in October 2023. It brought many improvements to the user interface and user experience, along with new features in modules like accounting, marketing, manufacturing, websites, and more.
The Odoo 17 update has been a hot topic among startups, mid-sized businesses, large enterprises, and Odoo developers aiming to grow their businesses. Since it is now already the first quarter of 2024, you must have a clear idea of what Odoo 17 entails and what it can offer your business if you are still not aware of it.
This blog covers the features and functionalities. Explore the entire blog and get in touch with expert Odoo ERP consultants to leverage Odoo 17 and its features for your business too.
An Overview of Odoo ERP
Odoo ERP was first released as OpenERP software in February 2005. It is a suite of business applications used for ERP, CRM, eCommerce, websites, and project management. Ten years ago, the Odoo Enterprise edition was launched to help fund the Odoo Community version.
When you compare Odoo Community and Enterprise, the Enterprise edition offers exclusive features like mobile app access, Odoo Studio customisation, Odoo hosting, and unlimited functional support.
Today, Odoo is a well-known name used by companies of all sizes across various industries, including manufacturing, retail, accounting, marketing, healthcare, IT consulting, and R&D.
The latest version, Odoo 17, has been available since October 2023. Key highlights of this update include:
Enhanced user experience with improvements to the command bar, faster backend page loading, and multiple dashboard views.
Instant report generation, credit limit alerts for sales and invoices, separate OCR settings for invoice creation, and an auto-complete feature for forms in the accounting module.
Improved image handling and global attribute changes for mailing lists in email marketing.
A default auto-signature option and a refuse-to-sign option in HR modules.
Options to divide and merge manufacturing orders, track the status of manufacturing orders, and more in the MRP module.
Dark mode in Odoo 17.
Now that the Odoo 17 announcement is official, let’s look at what’s new in Odoo 17!
What is Odoo ERP 17?
Odoo 17 is the latest version of one of the world’s leading open-source enterprise ERPs. This version has come up with significant improvements explained here in this blog. Also, this new version aims to introduce features that enhance time-saving, efficiency, and productivity for users across various organisations.
Odoo 17, released at the Odoo Experience 2023, brought notable improvements to the user interface and added new functionalities with enhancements in performance, accessibility, data analysis, and management, further expanding its reach in the market.
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JDK not so hidden treasures
- 1. JDK not so hidden treasures
- 3. about:me
- 6. java
- 7. If Java had true garbage collection, most programs would delete themselves upon execution Robert Sewell
- 8. tl;dr: log gc at least
- 9. every known problem becomes completely new when you add “in Java” stolen from: @mryapee
- 10. javac
- 12. javap
- 14. when things go…
- 15. does it run?
- 16. top // htop
- 19. jar
- 21. and jhat
- 22. stacktraces :)
- 23. kill -3 <pid>
- 24. caveat ;-)
- 25. jstack
- 26. quiz time
- 27. caveats only at safepoints, one thread at a time
- 28. jstat
- 30. jstatd
- 32. jcmd
- 34. jvisualvm