Identify and resolve performance bottlenecks, memory leaks, and threading issues
This tutorial aims to enable you to identify and resolve problematic patterns in memory and CPU usage in Java and Scala codeusing JProfiler and JVisualVM.
Profilers in the Market
Higher level profiling data. JProfiler has a number of probes that show you higher level data from interesting subsystems in the JRE. In addition to the Java EE subsystems like JDBC, JPA/Hibernate, JSP/Servlets, JMS, web services and JNDI, JProfiler also presents high level information about RMI calls, files, sockets and processes. Jprofiler License Agreement. Admin December 11, 2020. Support and upgrade packages extend your support period or add support to standard licenses. Floating licenses allow any number of developers to install JProfiler. A license server controls the number of simultaneous users. Individual licenses are developer-by-developer licenses and allow.
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One survey published 2015-11 as pdf presented these market share numbers:
Comparison for Mac (named license with two years of support):
JVisualVM
VisualVM has the largest market share because perhaps it is free and is bundled in the JDK since JDK 6 update 7.
http://docs.oracle.com/javase/7/docs/technotes/guides/visualvm/profiler.html
The bleeding-edge version at
https://visualvm.github.io/download.html is actively maintained by two developers in Prague, the Czech Republic.
VIDEO:
Philip Starritt has created videos on VisualVM:
JProfiler Install & License
See Sample App Leak Memory
Just to walk through JProfiler’s UI, let’s look at a program provided by JProfiler to behave badly.
Root Causes
Memory leaks was a small part of all issues according to this report in 2015
JProfiler Origin Tracker
Although Chrome announced it is doing away with Extensions,JProfiler Origin Tracker Chrome Browser Extensioncan still be useful.
Strategy
JProfiler has several “modes” it can run.
PROTIP: Take a “top-down” approach to analyzing a Java program.
The difference run-time data areas are illustrated here:From Java8 virtual machine architecture by Ranjith ramachandran
NOTE: In Java8, metaspace setting takes the place of the MaxPermSize parameter that specifies space of the method area holding classes.
ReTransform to Instrument CodeOther Sample Programs
http://www.javamonamour.org/2014/01/how-to-demo-garbage-collection-jconsole.htmldiscussed inhttps://www.youtube.com/watch?v=Bjv_9pKiALQ
JProfiler Social Media
The company behind JProfile, ej-technologies, is based in Munich, Germany.
There has been no activity on the @JProfiler Twitter account.
There is no JProfiler group on LinkedIn, Facebook, etc.
JMC (Java Mission Control)
Java Mission Controlmonitors the JVM in real-time.
Java Mission Control requires a commercial license for use in production.
JMC has an Experimental Plug-in for Eclipse.
PROTIP: JMC comes bundled with the HotSpot JVM since Oracle JDK 7 Update 40 (7u40). So in a Terminal:
https://docs.oracle.com/javacomponents/index.html
Oracle also provides optional tools for heap dump analysis and DTrace recording.
Java SE Suite provides Deterministic GC.
YourKit
YourKitfrom Germanyhas profilers for both JVM and .NET.
Censum
Censum from JClarity.com (by Martijn Verburg based in London) is available as both a local VM log reader (for $749/year) and as a SaaS web app.
Ej Technologies Jprofiler 11 120
https://blog.codecentric.de/en/2017/09/jvm-fire-using-flame-graphs-analyse-performance/
Ej Technologies Jprofiler 11 12 2019
CTO/CEO Martijn Verburg (@karianna) speaks at VIDEO: The Diabolical Developer’s Guide to Performance Tuning introduces the Performance Diagnostic Methodology (PDM).
Tapiki
Takipi is focused on Scala performance tuning.It is the only tool I know of that shows numbers associated with Scala code.It’s free up to 2 servers for Scala.
What to Look For
https://shipilev.net/blog/2016/close-encounters-of-jmm-kind/
As a comparison, take a look at theprofiler in Visual Studio for C# Xamarin code.
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This article is one of a series about tuning and performance:
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