JCStress 0.11

[Aleksey Shipilev]

Hi,

JCStress 0.11 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:

  *) Regression: interruption tests were failing after recent refactoring; and this went unnoticed 
in current CIs
   7902917: jcstress: Errors during interruption tests

  *) Reliability: More Linux sysfs bugfixes, used to fail on some virtualized environments
   7902919: jcstress: Sysfs topology parser fails due to oddly intersecting core IDs

  *) Reliability: Forked VM (the VM that actually runs tests) code now uses less 
java.util.concurrent to avoid potential bugs that could break the infra before the failure is 
detected in tests.
   7902923: jcstress: Eliminate dependency on Executors/Futures in forked VMs

  *) Dropped features: Whitebox and online deoptimization support was removed. This is now better 
catered by multiple forks, which allows to capture the randomization seeds for better replication, 
makes the VM outputs relate to one compilation session only, etc.
   7902914: jcstress: Remove Whitebox and deoptimization support

  *) Performance: Reworking the binary link protocol for better performance. Removing one-off Java 
serialization calls out of the critical path helps performance, as those path would nearly always 
run in interpreter, do classloads, etc. Plus, carrying less data over the link helps performance.
   7902916: jcstress: Pass a limited subset of TestConfig to the forked VMs
   7902918: jcstress: Replace the relevant uses of HashMultiset with Counter
   7902920: jcstress: Rework binary link client/server for lower latency

  *) Performance: Moving some initializations out of workers helps fork startup. Avoiding the code 
from run-once infrastructure path helps cold startup too.
   7902921: jcstress: Pre-warmup affinity support and thread pools
   7902922: jcstress: Tune up generated code once more

Enjoy!

-- 
Thanks,
-Aleksey