JCStress 0.12

[Aleksey Shipilev]

Hi,

JCStress 0.12 is released and available on Maven Central. This is useful for those who use
JCStress as Maven dependency. This release further improves harness reliability and testing performance.

It comes with the following improvements and bugfixes:

  *) Reliability: results that had different "reference" results were mistakenly treated as the 
same, thus hiding some test behaviors. It is highly recommended to update to get this bug fix.
   7902957: jcstress: L-results are always equal to each other

  *) UX improvements: multiline status line for better presentation, reporting running VM counts, 
report active CPU counts, report better ETA.
   7902943: jcstress: Update console UX again
   7902953: jcstress: Minor touchups for status line and percent reporting
   7902959: jcstress: Update progress line to ANSI multi-line for better presentation

  *) Performance: startup performance improved by skipping unnecessary inits, preemptively warming 
up the infrastructure, disabling unnecessary VM features. This mostly helps -m sanity, but also 
helps shorter -m quick runs in a minor way.
   7902947: jcstress: Skip affinity initialization when non-local affinity mode is requested
   7902949: jcstress: Warm up AllocationProfilingSupport support early
   7902952: jcstress: Disable UsePerfData to improve I/O costs

  *) Performance: JNA startup performance and disk I/O usage improved by reusing the unpacked library
   7902946: jcstress: Upgrade JNA to 5.8.0
   7902951: jcstress: Optimize JNA loading paths
   7902954: jcstress: Move unpacked JNA library to proper name

  *) Performance: avoid serialization/deserialization paths for some Result types. This improves 
startup performance (-m sanity yet again) and somewhat improves the steady-state performance.
   7902948: jcstress: Shortcut counter copy path for copyable results

  *) Performance: parallelize waiting for start/finish of forked VMs, which helps startup 
performance (-m sanity yet again) and sometimes even the steady-state performance on slow hardware 
or slow JVMs.
   7902950: jcstress: Offload VM start/finish/output tasks to separate workers

Enjoy!

-- 
Thanks,
-Aleksey