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Posted to issues@maven.apache.org by "Sander Verbruggen (Jira)" <ji...@apache.org> on 2021/06/15 08:02:00 UTC

[jira] [Created] (MNG-7174) Parallel builds on macos get the thread count wrong

Sander Verbruggen created MNG-7174:
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             Summary: Parallel builds on macos get the thread count wrong
                 Key: MNG-7174
                 URL: https://issues.apache.org/jira/browse/MNG-7174
             Project: Maven
          Issue Type: Bug
          Components: Performance
    Affects Versions: 3.8.1, 3.6.3
            Reporter: Sander Verbruggen


When supplying `-T1C` to do a parallel build on macos, maven counts the _logical_ cores, not the _physical_ ones. This results in the system being overloaded and less responsive (twice the load it can handle).

 

Steps to reproduce:

sysctl -a|grep 'cpu.thread_count\|cpu.core_count' gives this output on my machine:

machdep.cpu.core_count: 4
machdep.cpu.thread_count: 8

Starting a maven session with `-T1C

 



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