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While the GC MxBeans have gradually improved the data available through them, the GC logs still have much more detailed information and if you need to analyze GC performance, you are still best off using the data from the GC logs

GC log analysis tools are therefore very useful. So it's big news that one of the two commercial tools that did this, Censum, has now had it's core open sourced and released (as Microsoft GCToolkit). See the news item below where Kirk (the author) gives an introduction to the toolkit

Now on to all the usual newsletter list of links, tips, tools, news and articles, and as usual I've extracted all the tips into this month's tips page - and one particularly interesting point from Brendan Gregg is that your application should be able to scale to use 1000 threads, or it will soon be out of date

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News

Java performance tuning related news

• How the JIT compiler boosts Java performance in OpenJDK
• ZGC | What's new in JDK 17 - supports UseDynamicNumberOfGCThreads to dynamically optimize the number of GC threads; stopped the previously delayed termination of the JVM; prevents excessive mark stack memory usage; a second mxBean (now ZGC Cycles and ZGC Pauses); runs on MacOS/Aarch64
• The old Censum GC logs analyzer has been upgraded and released as Microsoft GCToolkit

Tools

Java performance tuning related tools

• JavaMelody - Monitoring for JavaEE applications
• Java implementations of concurrent Radix Trees and concurrent Suffix Trees
• Microsoft GCToolKit - a set of libraries for analyzing HotSpot Java garbage collection (GC) log files

Articles

• Computing Performance: On the Horizon (Brendan Gregg/Usenix)
• JVM Memory Leaks (Mikhail Horbunov/Engineering Community)
• Java performance talk - Performance Engineers Clubhouse (Ram Lakahmanan/yCrash)

Jack Shirazi

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