On Wed, 24 Apr 2024 16:04:30 GMT, Serguei Spitsyn <sspit...@openjdk.org> wrote:
> This is a fix of the following JVMTI scalability issue. A closed benchmark > with millions of virtual threads shows 3X-4X overhead when a JVMTI agent has > been loaded. For instance, this is observable when an app is executed under > control of the Oracle Studio `collect` utility. > For performance analysis, experiments and numbers, please, see the comment > below this description. > > The fix is to replace the global counter `_VTMS_transition_count` with the > mark bit `_VTMS_transition_mark` in each `JavaThread`'. > > Testing: > - Tested with mach5 tiers 1-6 This pull request has now been integrated. Changeset: 663acd2e Author: Serguei Spitsyn <sspit...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/663acd2e173114fec7c2f50084af9ec56150d394 Stats: 42 lines in 5 files changed: 14 ins; 11 del; 17 mod 8330969: scalability issue with loaded JVMTI agent Reviewed-by: amenkov, cjplummer ------------- PR: https://git.openjdk.org/jdk/pull/18937
