JMH 1.15

[Aleksey Shipilev]

Hi,

JMH 1.15 is released and available at Maven Central (props to Evgeny
Mandrikov, our persistent releaser). This is an update which has a few
important bugfixes and usability improvements, we recommend to upgrade.
Details:

 *) @Group thread distribution is unstable between iterations. Which
means that two or more threads executing the asymmetric benchmark may
suddenly swap the methods they are executing, in-between iterations.
This would cause losing their Scope.Thread @State object references. Fixed:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7901810

 *) Failing @Setup method can be entered multiple times. This happens
before JMH used to treat the object as "done with setup" once @Setup
completes successfully. If it doesn't, then after one thread fails with
exception, another thread may enter @Setup again. The exception may look
different the second time around, because state object was partially
initialized, confusing the user. Fixed:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7901809

 *) @AuxCounters improvements. Note this is still a very much
experimental API. That said, it makes sense to improve it a little more:
now it handles more field/method types, has new counting mode "events"
that does not normalize to time, and does not require reset between
iterations. This API change is backwards-compatible. See the RFE:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7901810
...and new Javadoc:

http://hg.openjdk.java.net/code-tools/jmh/file/b35ea744ed81/jmh-core/src/main/java/org/openjdk/jmh/annotations/AuxCounters.java

Enjoy!

Thanks,
-Aleksey