org.gridkit.jvmtool::ygc-bench

Young GC pause benchmark

License	The Apache Software License, Version 2.0
GroupId	org.gridkit.jvmtool
ArtifactId	ygc-bench
Last Version	0.4.2
Release Date	Jul 7, 2016
Type	jar
Description	org.gridkit.jvmtool::ygc-bench Young GC pause benchmark
Project URL	http://code.google.com/p/gridkit/ygc-bench

Download ygc-bench

Filename	Size
ygc-bench-0.4.2.pom
ygc-bench-0.4.2.jar	12 KB
ygc-bench-0.4.2-sources.jar	4 KB
ygc-bench-0.4.2-javadoc.jar	33 KB

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/org.gridkit.jvmtool/ygc-bench/ -->
<dependency>
    <groupId>org.gridkit.jvmtool</groupId>
    <artifactId>ygc-bench</artifactId>
    <version>0.4.2</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/org.gridkit.jvmtool/ygc-bench/
implementation 'org.gridkit.jvmtool:ygc-bench:0.4.2'

Gradle Kotlin

// https://jarcasting.com/artifacts/org.gridkit.jvmtool/ygc-bench/
implementation ("org.gridkit.jvmtool:ygc-bench:0.4.2")

Apache Buildr

'org.gridkit.jvmtool:ygc-bench:jar:0.4.2'

Apache Ivy

<dependency org="org.gridkit.jvmtool" name="ygc-bench" rev="0.4.2">
  <artifact name="ygc-bench" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='org.gridkit.jvmtool', module='ygc-bench', version='0.4.2')
)

Scala SBT

libraryDependencies += "org.gridkit.jvmtool" % "ygc-bench" % "0.4.2"

Leiningen

[org.gridkit.jvmtool/ygc-bench "0.4.2"]

Dependencies

compile (1)

Group / Artifact	Type	Version
org.gridkit.jvmtool : sjk-core	jar	0.4.2

test (1)

Group / Artifact	Type	Version
junit : junit	jar	4.10

Project Modules

There are no modules declared in this project.

Swiss Java Knife (SJK)

SJK is a command line tool for JVM diagnostic, troubleshooting and profiling.

SJK exploits standard diagnostic interfaces of JVM (such as JMX, JVM attach and perf counters) and add some more logic on top to be useful for common troubleshooting case. SJK is also can be used as library for building application specific diagnostic tools or to enhance your code with self monitoring features.

What you can do with SJK?

• Monitor Java threads in real time
• Analyze head dynamics with advanced class histograms
• Access MBean attributes and operation from command line
• Create flame graphs and over reports from snapshots created VisualVM, Java Flight Recorder or SJK's own sampler

See full command reference.

Download

Latest prebuild binaries

• wget https://bit.ly/2YNDZfg -O sjk.jar -> sjk.jar - all commands without mxdump
• wget https://bit.ly/2H3Uqck -O sjk.jar -> sjk-plus.jar - all commands

Starting sjk

java -jar sjk.jar <cmd> <arguments>
java -jar sjk.jar --commands
java -jar sjk.jar --help <cmd>

Below a few command from SJK (full command reference).

ttop

Pools thread CPU usage of target JVM and periodically report to console.

• can attach via PID or open JMX port
• display thread memory allocation rate and cumulative process allocation rate
• display safe point time consumption (only if attache via PID)

More details

hh

Similar to jmap -histo.

• plus can show histogram of dead objects (histograms of all and live requested, then difference is calculated)
• plus can show N top buckets in histogram

More details

stcap, stcpy, ssa and flame

These commands provide basic sample profiler capabilities. stcap produces hyper-dense stack trace dump (about 1000 compression rate compared to text format) and ssa provides few reports over dump files. stcpy can copy data in archives produced by stcap (e.g. merging dumps or filtering selected threads).

So far following reports are available

• sophisticated filtering (time, stack trace, thread name)
• stack frame histogram with advanced filtering options
• flame graph visualization (SVG or interactive HTML)
• per thread summary (CPU usage, memory allocation, etc)
• converting back to text format

Dump file can be also processed programatically.

More details

mx

This command allow you to do basic operations with MBean from command line.

It can

• read MBean attributes
• update MBean writeable attributes
• invoke MBean operations (arguments are supported)
• displays composite and tabular data in human readable format
• use wild cards to shorten MBean names (e.g. *:*,name=CodeCacheManager instead of java.lang:type=MemoryManager,name=CodeCacheManager)
• connect to local JVM processes by PID (e.i. any Java process, you do not need to enable JMX server)
• connect to JMX using host:port (password authentication is supported)

More details

jps

Similar to jps from JDK.

• plus could display specific system properties of process in output
• plus could display values of specific -XX for HotSpot JVM processes
• plus could filter process java processes by their system properties

More details

gc

Report information about GC in real time. Data is retrieved via JMX.

More details

mxdump

Dumps all MBeans of target java process to JSON.

Versions

Version
0.4.2 Jul 7, 2016
0.4.1 Mar 27, 2016
0.4.0 Jan 24, 2016
0.3.9 Jan 14, 2016
0.3.8 Sep 10, 2015
0.3.7 Jul 17, 2015
0.3.6 May 20, 2015
0.3.5 Mar 18, 2015
0.3.4 Feb 17, 2015
0.3.3 Dec 17, 2014
0.3.2 Dec 16, 2014
0.3.1 Nov 26, 2014
0.3 Aug 24, 2014
0.2 Jun 22, 2014
0.1.2 Jun 11, 2014