Web Performance Metrics Cheatsheet | bitsofcode
I recently gave a talk on “Making Sense of Performance Metrics” at the Web Unleashed Conference, and it was suggested that I turn the breakdown of all the performance metrics into a cheatsheet; so here it is! The full cheatsheet, including a downloadable PDF version, are at the bottom of the page so feel free to skip to that. Four Questions # In a web.dev article on "User-centric Performance Metri
CPU Flame Graphs
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Javaトラブルに応じた初動対応のまとめ - n-agetsumaの日記
Javaトラブルでは『情報がなくて、再現もなかなかしません』といった状況に陥ることがある。このような状況を回避するために、以下の3つの代表的なトラブルを例に、アプリケーションサーバを再起動する前に何を取得すれば良いのかをまとめてみる。 アプリケーションから応答がない アプリケーションが遅い ヒープメモリが足りない(OutOfMemoryErrorの発生) アプリケーションから応答がない 取得する情報 スレッドダンプ データ取得方法 スレッドダンプとは、コマンド実行時点でのJavaスレッド実行状態を出力したものである。応答がない場合、何らかの要因によりどこかで処理が止まっていることが想定される。スレッドダンプは『どこで止まっているのか？』を切り分けるのに大切な情報である。 取得方法はJDKのバージョンによって色々ある。 kill -3 <pid> (少なくとも1.4.2にはある〜JDK7でも
JavaのCPUプロファイリング - nekop's blog
JBoss / WildFly (全部俺) Advent Calendar 2013の19日目です。Java一般なトピック寄りで。 自分で主に利用するJavaのプロファイラはYourKitなのですが、YourKitを購入していない場合で性能問題を解析するときとかに何が使えるかなぁと思って調べてみました。 $ uname -a Linux localhost.localdomain 3.11.10-301.fc20.x86_64 #1 SMP Thu Dec 5 14:01:17 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux $ java -version java version "1.7.0_45" OpenJDK Runtime Environment (fedora-2.4.3.0.fc20-x86_64 u45-b15) OpenJDK 64-Bi
HeapStats - IcedTea
1 News Do not use with OpenJDK 8u262 or later in the OpenJDK8 series (2020/7/24) OpenJDK 8u262 is awesome release because JDK Flight Recorder (JFR) is included in some JDK distributions. However, unfortunately HeapStats agent may not work well on 8u262 or later. Checking Java heap on 8u262 or later, using JFR is recommended. See Operating Environment section below on this page for detail. See also
Tracking down a memory leak in Node.js and Socket.IO
If you are running Node.js 0.8 and Socket.IO over HTTPS then you will be affected by this memory leak. See the bottom of the post for details of a fix. Node.js is a great bit of kit, but it’s still a relatively young technology. I was bitten by this recently when I had to investigate a large memory leak in one of the Node.js apps I maintain. There are tools that can help to track down these sorts
ContiPerf 2
Overview ContiPerf is a lightweight testing utility that enables the user to easily leverage JUnit 4 test cases as performance tests e.g. for continuous performance testing. It is inspired by JUnit 4's easy test configuration with annotations and by JUnitPerf's idea of wrapping Unit tests for performance testing, but more powerful and easier to use: Using Java annotations for defining test executi
Java development/profiling tool: Classmexer agent
Classmexer is a simple Java instrumentation agent that provides some convenience calls for measuring the memory usage of Java objects from within an application. It currently provides the following static calls from the MemoryUtil class, inside the com.javamex.classmexer package: public static long memoryUsageOf(Object obj) public static long deepMemoryUsageOf(Object obj) public static long deepMe
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GitHub - google/pprof-nodejs: pprof support for Node.js
GitHub - uber-common/jvm-profiler: JVM Profiler Sending Metrics to Kafka, Console Output or Custom Reporter
GitHub - sitespeedio/sitespeed.io: sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.
GitHub - enebo/alienist
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jcmd をさわってみよう
GitHub - MiniProfiler/go: A simple but effective mini-profiler for Go websites
YourKit Profiler
Google Code Archive - Long-term storage for Google Code Project Hosting.
GitHub - bnoordhuis/node-heapdump: Make a dump of the V8 heap for later inspection.
GitHub - alvins82/java-mini-profiler-core
GitHub - bnoordhuis/node-profiler: Access the V8 profiler from node.js
