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In Richard Warburton's "Fantastic Performance" talk (see the articles below), he lists the free low overhead profilers available for running against production systems. It's pretty interesting to see this list:

• async-profiler
• honest profiler
• perf-mapper-agent
• JDK flight recorder (this is embedded in the JVM, you usually view the recordings using jmc)
• Oracle Developer Studio

Since JDK 11, JDK flight recorder is free to use and probably the first choice from this list simply because of ease of use - it's already in the JVM and can be triggered multiple ways (see my newsletter with those details and the tools section in this page to find the reference links).

Being able to profile a JVM in production as standard is a big step that we have had since JDK 11, being able to collect and use those profiles as needed is further big step that you should build or buy so that you can analyse your system in depth at any time.

Now on to this month's tips, tools, news, articles, and those talks. And of course the tips from this month's articles and talks, as ever are extracted into this month's tips page.

A note from this newsletter's sponsor

News

Java performance tuning related news.

• Twitter open sources its telemetry tool Rezolus for detection of short-lived anomalies
• How and why to use copy-on-write for thread safety
• Stagemonitor 0.89 released, open source application performance monitoring for java server applications
• Details of how Alibaba's JWarmUp tool improves warmup time for applications
• Proposal to add precompiling java hot methods at application startup

Tools

Java performance tuning related tools.

• Rezolus tool for collecting detailed systems performance telemetry and exposing burst patterns through high-resolution telemetry
• Stagemonitor Java monitoring agent that tightly integrates with time series databases like Elasticsearch, Graphite and InfluxDB to analyze graphed metrics and Kibana to analyze requests and call stacks
• Open source application performance monitoring for java server applications
• Alibaba Dragonwell JDK optimized for extreme scale e-commerce, financial, logistics applications. Includes JWarmUp

Articles

• The Trouble with Memory (Kirk Pepperdine/QCon)
• HotSpot Performance Case Study (Sergey Kuksenko/Oracle)
• Fantastic Performance and where to find it (Richard Warburton/Devoxx)
• Threads in JVM: managing, observing and diagnosing (Adam Dubiel/JavaZone)

Jack Shirazi

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