scottoaks / javaperformancetuning Goto Github PK

View Code? Open in Web Editor NEW

665.0 665.0 317.0 2.79 MB

Examples for O'Reilly & Associates Java Performance Tuning: The Definitive Guide

Java 99.46% C 0.19% Shell 0.11% Makefile 0.07% Dockerfile 0.17%

javaperformancetuning's People

Contributors

Stargazers

Watchers

Forkers

yubo-yue greggagne tomekl007 chqing ishara qqbwww arturmkrtchyan princessd8251 binwei tmjee hongbing yousk520 rajagrawal104 schnell18 madhukarreddy siosio sedavnikh edwardbeckett moujian harsh-cseiitd rom8 nikolalucic yanbit vivekasingh sourcewarehouse rusakovichma keita-n ellasafy 2899722744 aubs dineshg13 yshthdn jawadhf xinglongbing duydo chenhuimin nghinv rsvoboda findepi codingdock lovejavaee srinivaskommu hongzhenglin wuryan nikikiy comenglish ckeyin lldaaron imoyoukan gitdemotest siyouqiang francoisa sqtds skykewei skywaiting archie-lab costajoaohenrique ynwawang billjyc kobeandlebron zlpha phandinhman handerwei helos3 fenglvming mbhavya jieliu charlesliang1 janecms hxysea developcarlosmd leehwajung wangbo009 muyinchen bohdanlevchenko leonzhouwei chakra-coder binishkurian noif jw0201 copyshop wangchongya richardboot hczboy who7708 home3k lancelothuxi codershamo sha517 linuxwei hectorinx avneesh-rai activeman shamim-ahmed theganeshkumawat lblw rickyzhang82 paulcoffee-zh raisingstar dax1n

javaperformancetuning's Issues

Confused About the "parking" sub state in ParseJStack.java

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 266 in 49d6b37

jsp.insertJavaMethod(waitingThreads, true);

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 279 in 49d6b37

jsp.insertJavaMethod(blockedThreads, true);

Why
"TIMED_WAITING" state + "parking" sub state -> waitingThreads
But
"WAITING" state + "parking" sub state -> blockedThreads

I think they all belong to waitingThreads.

stockSessionBean cause NullPointerException

I use the second edition code examples, but it throws NullPointerException when I run it.

Some problem about ParseJstack

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 27 in 49d6b37

public class ParseJStack {

exception with dead-lock info with jstack -l

"GC task thread#9 (ParallelGC)" os_prio=31 tid=0x00007fb63e01a800 nid=0x5203 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007fb63f81a800 nid=0x7403 waiting on condition 

JNI global references: 15


Found one Java-level deadlock:
=============================
"Thread-1":
  waiting to lock monitor 0x00007fb63f8162e8 (object 0x000000076ac1bc98, a java.lang.String),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x00007fb63f815528 (object 0x000000076ac1bcc8, a java.lang.String),
  which is held by "Thread-1"

Java stack information for the threads listed above:
===================================================
"Thread-1":
	at com.alibaba.jstacktest.DeadLockSyncTest$LockB.run(DeadLockSyncTest.java:42)
	- waiting to lock <0x000000076ac1bc98> (a java.lang.String)
	- locked <0x000000076ac1bcc8> (a java.lang.String)
	at java.lang.Thread.run(Thread.java:750)
"Thread-0":
	at com.alibaba.jstacktest.DeadLockSyncTest$LockA.run(DeadLockSyncTest.java:23)
	- waiting to lock <0x000000076ac1bcc8> (a java.lang.String)
	- locked <0x000000076ac1bc98> (a java.lang.String)
	at java.lang.Thread.run(Thread.java:750)

Found 1 deadlock.

not exclude socketWrite0 from running Threads
should not skip fixed lines except running, becasue we already know of stack from classification

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 263 in 49d6b37

jsp.insertJavaMethod(waitingThreads, 2);

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 269 in 49d6b37

jsp.insertJavaMethod(sleepingThreads, 2);

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 282 in 49d6b37

jsp.insertJavaMethod(waitingThreads, 2);

if top of jstack is not jdk inner method, should skip it

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 187 in 49d6b37

private void skipJavaClasses() throws IOException {

missing io write classification
missing some important top of stack about net work write read。like PlainDatagramSocketImpl.receive0, PlainDatagramSocketImpl.send0 etc.

Recommend Projects

React

A declarative, efficient, and flexible JavaScript library for building user interfaces.
Vue.js

🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
TensorFlow

An Open Source Machine Learning Framework for Everyone
Django

The Web framework for perfectionists with deadlines.
Laravel

A PHP framework for web artisans
D3

Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

javascript

JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
web

Some thing interesting about web. New door for the world.
server

A server is a program made to process requests and deliver data to clients.
Machine learning

Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Visualization

Some thing interesting about visualization, use data art
Game

Some thing interesting about game, make everyone happy.

Recommend Org

Facebook

We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft

Open source projects and samples from Microsoft.
Google

Google ❤️ Open Source for everyone.
Alibaba

Alibaba Open Source for everyone
D3

Data-Driven Documents codes.
Tencent

China tencent open source team.