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Since I restarted regularly giving conference talks a couple of years ago, all my talks have been packed to the edges, with people standing. This tells me there is huge ongoing interest in all things Java performance related.

My latest The 10 Common Concurrency Models from this month's Devoxx is just a 15 minute whirlwind tour that explains why there are so many of these models for you to choose from, yet without a clear winner. Heinz Kabutz, my colleague and fellow newsletter writer ( Java Specialists Newsletter) was in the audience and later correctly pointed out to me that ThreadLocal is part of an "unshared" model rather than part of the "atomic" optimistic cannon.

It didn't surprise me that I missed that, this whole concurrency model world is a massive mix of overlapping options and, as with all my talks and articles, I'm trying to impose some clarity so that it's easier to choose what's right for your application. What's clear is that you should make a conscious informed decision rather than drift from one to another (as happened in another of this month's linked talks, "The 7 deadly sins of concurrent programming", see below).

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.

• Renaissance benchmark suite focuses on parallelism and concurrency exercising the modern parallel programming abstractions
• Spring boot benchmarks and tips on making it start faster and smaller
• OpenJ9 Concurrent Scavenge Garbage Collection policy
• Don't do heavy computation in an uninitialized class directly, use a helper class with no static initializer

Tools

Java performance tuning related tools.

• Distributed tracing tools
• Kubernetes Native Java stack targeted at fast startup and low memory
• The Renaissance Benchmark Suite for benchmarking common modern JVM workloads, including, but not limited to, Big Data, machine-learning, and functional programming. The suite is intended to be used to optimize just-in-time compilers, interpreters, GCs, and for tools such as profilers, debuggers, or static analyzers
• All-in-one jmap + jstack + jcmd + jinfo functionality using JVM Dynamic Attach utility to send commands to remote JVM via Dynamic Attach mechanism

Articles

• The 10 Common Concurrency Models (Jack Shirazi/Devoxx)
• The 7 deadly sins of concurrent programming (Sarah Zebian, Taoufik Benayad/Devoxx)
• Low level Java optimisation (Peter Lawrey/MelbJVM)
• Concurrency and Parallel Programming in Java (Arvind Kumar/Oracle)

Jack Shirazi

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