JCStress 0.9

[Aleksey Shipilev]

Hi,

JCStress 0.9 is released and available on Maven Central. This is useful for those who use
JCStress as Maven dependency.

It comes with the following improvements:

  *) Major upgrade: the harness should now be able to parse the current CPU topology and schedule 
the actor threads in all interesting package/core sharing combinations. This should greatly increase 
the testing accuracy, since we no longer depend on OS scheduler to distribute actor threads in a 
lucky way. (This is currently fully implemented on Linux. Windows and Mac OS support PRs are welcome.)
   7902875: jcstress: Employ actor affinity to run across/with in interesting packages/cores/threads

  *) Split compilation updates: there are special JDK builds that do not have C1, or C2, or both 
compilers available. For example, Zero VMs. In that case, we can trim down the number of split 
compilation configs the harness tries
   7902872: jcstress: check for C1/C2 availability and adjust configurations

  *) UX improvement: the console logger was improved to be more human-readable
   7902873: jcstress: Clean up text reporting
   7902880: jcstress: Improve test line reporting again

  *) UX improvement: when VM fails, harness now prints the full logs from the failing VM
   7902874: jcstress: Print messages and VM streams on VM failure

  *) UX improvement: very verbose mode prints the hot actor code disassembly, but it needs 
-XX:+DebugNonSafepoints to get the annotated assembly. This workarounds the JDK-8264359 bug.
   7902865: jcstress: Enable -XX:+DebugNonSafepoints if available to get more verbose disassembly

Enjoy!

-- 
Thanks,
-Aleksey