[prev in list] [next in list] [prev in thread] [next in thread] 

List:       openjdk-serviceability-dev
Subject:    Re: RFR: 8330969: scalability issue with loaded JVMTI agent [v3]
From:       Chris Plummer <cjplummer () openjdk ! org>
Date:       2024-04-30 19:34:53
Message-ID: K5-b9oomLlDxPgpSWUyiLaGl3vVVKDxY7oFOgJoc_dE=.a319743b-656f-470b-a9a7-83918bd23a6a () github ! com
[Download RAW message or body]

On Tue, 30 Apr 2024 01:56:13 GMT, Serguei Spitsyn <sspitsyn@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
> 
> Serguei Spitsyn has updated the pull request incrementally with one additional \
> commit since the last revision: 
> review: correct comments related to VTMS transition counters

Marked as reviewed by cjplummer (Reviewer).

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

PR Review: https://git.openjdk.org/jdk/pull/18937#pullrequestreview-2032369700


[prev in list] [next in list] [prev in thread] [next in thread]