[
https://issues.apache.org/jira/browse/LUCENE-9196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17033612#comment-17033612
]
Dawid Weiss commented on LUCENE-9196:
-------------------------------------
Maybe I'm being overprotective here but it'll make it a pain to switch between
JVMs if those local settings are just global. And
those rare people that run with J9 would have the generated defaults that'd
fail on a subsequent gradle invocation. I'm not saying no - I'm just looking at
how it could work for everyone in a reasonable way (and I don't see any obvious
answer).
> look into adding -XX:ActiveProcessorCount=1 to parallel build jvms
> ------------------------------------------------------------------
>
> Key: LUCENE-9196
> URL: https://issues.apache.org/jira/browse/LUCENE-9196
> Project: Lucene - Core
> Issue Type: Task
> Components: general/build
> Reporter: Robert Muir
> Priority: Major
>
> I've been using this in my own gradle.properties (both for test and gradle
> vms).
> I think otherwise there may be a bad multiplicative effect at play: if you
> have N (say 16 cores), the build defaults to using 8 parallel resources. But
> each of these jvms uses ergonomic defaults to size stuff like compiler/gc
> threads according to the entire machine. Similar to the reasons behind
> container support, etc.
> I tell each build/test JVM to pretend like it runs on 1 cpu machine with this
> flag. It seems to give a lower load average when running tests? Something to
> look into.
> {quote}
> -XX:ActiveProcessorCount=x
> Overrides the number of CPUs that the VM will use to calculate
> the size of thread pools it will use for various operations such
> as Garbage Collection and ForkJoinPool.
> The VM normally determines the number of available processors
> from the operating system. This flag can be useful for parti‐
> tioning CPU resources when running multiple Java processes in
> docker containers. This flag is honored even if UseContainer‐
> Support is not enabled. See -XX:-UseContainerSupport for a de‐
> scription of enabling and disabling container support.
> {quote}
> cc [~dweiss]
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org
For additional commands, e-mail: issues-h...@lucene.apache.org
