RFR: 8318727: Enable parallelism in vmTestbase/vm/gc/concurrent tests

Tue Oct 24 19:41:00 UTC 2023

The commit includes changes to unblock parallelism for more `hotspot:tier4 tests.` in `test/hotspot/jtreg/vmTestbase/gc/concurrent`  tests.

Below are the before and after test run comparisons:

Before:
'linux-x86_64-server-release' 9066.56s user 2289.94s system 880% cpu 21:29.15 total
After:
linux-x86_64-server-release': 3159.71s user 264.93s system 2891% cpu 1:58.45 total

-------------

Commit messages:
 - 8318727:Enable parallelism in vmTestbase/vm/gc/concurrent tests

Changes: https://git.openjdk.org/jdk/pull/16350/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16350&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318727
  Stats: 943 lines in 41 files changed: 0 ins; 943 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16350.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16350/head:pull/16350

PR: https://git.openjdk.org/jdk/pull/16350