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News January 2021

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I haven't really specifically covered Red Hat's Shenandoah garbage collector in any newsletter, though I do include it in all the garbage collectors available with the full recommendations I make for garbage collectors (see my easy to follow guides, covered in my GC focused newsletter)

Now one exciting piece of news from Roman Kennke (the Shenandoah project lead), mentioned near the end of a recent JVM Roundabout meetup means that Shenandoah may become the GC of choice for low pause applications: From JDK 17 (the next full long term support - LTS - release, coming in September this year) Shenandoah will be completely concurrent except for some constant time admin operations. That means that stop-the-world pauses will all be under 1 millisecond for all GCs!

Of course you don't get low pause for nothing, like all concurrent GC algorithms the lower the pause you want the more other CPU and memory you need to make available to the JVM, so this may or may not be the best choice for your application. And of course there's always edge cases that will cause longer GCs, all of which means you'll need to test if it's right for you. But regardless, having the option available is pretty exciting news!

Now on to all the usual newsletter list of links, tips, tools, news and articles below, and as usual I've extracted all the tips into this month's tips page .

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Jack Shirazi

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Last Updated: 2023-01-29
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