2015-10-21
- jennifer
- martym
fuyou001 fuyou001
omerlh
/ daemonset.yaml
Last active
April 20, 2023 08:50
A daemonset that print the most heavy files on each node
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| apiVersion: apps/v1 | |
| kind: DaemonSet | |
| metadata: | |
| name: disk-checker | |
| labels: | |
| app: disk-checker | |
| spec: | |
| selector: | |
| matchLabels: | |
| app: disk-checker |
mlafeldt
/ postmortem.md
Last active
June 3, 2025 05:37
Example Postmortem from SRE book, pp. 487-491
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| # -*- coding: utf-8 -*- | |
| from math import * | |
| from random import * | |
| ### 一次测试 ### | |
| def test(): | |
| speed = 4.0 #初速度 | |
| distance = 0 #已经走过的距离 | |
| threshold = log(50) / 100 #每秒中枪的概率 |
rednaxelafx
/ DirectMemorySize.java
Created
January 11, 2012 07:18
An Serviceability-Agent based tool to see stats of NIO direct memory, as an alternative on JDK6 without JMX support for direct memory monitoring. Only works on JDK6; to work on JDK7 will need some tweaking because static variables are moved to Java mirror
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| import java.io.*; | |
| import java.util.*; | |
| import sun.jvm.hotspot.memory.*; | |
| import sun.jvm.hotspot.oops.*; | |
| import sun.jvm.hotspot.debugger.*; | |
| import sun.jvm.hotspot.runtime.*; | |
| import sun.jvm.hotspot.tools.*; | |
| import sun.jvm.hotspot.utilities.*; | |
| public class DirectMemorySize extends Tool { |
rednaxelafx
/ CLHSDB session
Created
May 5, 2011 07:52
Another demo on primitive type arrays and wrapper type arrays in a Java program running on HotSpot, using SA on a core dump. Env: JDK6u25, x64, -Xmx10m (-server and -XX:+UseCompressedOops are on by default)
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| $ java -version | |
| java version "1.6.0_25" | |
| Java(TM) SE Runtime Environment (build 1.6.0_25-b06) | |
| Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) | |
| $ alias -p | grep clhsdb | |
| alias clhsdb='java -classpath .:$JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.CLHSDB' | |
| $ clhsdb | |
| hsdb> help | |
| Available commands: | |
| assert true | false |
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| # Original version: http://blog.tsunanet.net/2010/08/jpmp-javas-poor-mans-profiler.html | |
| # Usage: ./jpmp.sh <pid> <num-samples> <sleep-time-between-samples> | |
| #!/bin/bash | |
| pid=$1 | |
| nsamples=$2 | |
| sleeptime=$3 | |
| for x in $(seq 1 $nsamples) |
rednaxelafx
/ PrintThreadIds.java
Created
February 25, 2011 10:31
find out the correspondence between the tid/nid of Java threads as shown from jstack/JMX, on HotSpot/Linux
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| package fx.jvm.hotspot.tools; | |
| import java.util.List; | |
| import sun.jvm.hotspot.tools.Tool; | |
| public class PrintThreadIds extends Tool { | |
| public static void main(String[] args) { | |
| PrintThreadIds tool = new PrintThreadIds(); | |
| tool.start(args); |