[jira] [Created] (SOLR-16605) CPU in UI cloud->nodes is always 0%, even when Solr is very busy.

["Shawn Heisey (Jira)" <ji...@apache.org>]

Shawn Heisey created SOLR-16605:
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             Summary: CPU in UI cloud->nodes is always 0%, even when Solr is very busy.
                 Key: SOLR-16605
                 URL: https://issues.apache.org/jira/browse/SOLR-16605
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: Admin UI
    Affects Versions: 9.1
            Reporter: Shawn Heisey
            Assignee: Shawn Heisey
         Attachments: fixcpuadminui-1.patch

The Cloud->Nodes section of the admin UI is always reporting 0% CPU even on very busy Solr nodes.  I thought the attached patch would fix t, but it doesn't seem to be working.  Instead of always 0%, it now shows an occasional 50% or 100%... and even rarer is a different percentage like 84% or 17%.  The Solr process at that time was usng about 180% CPU (two CPUs in AWS instance).

Using OperatingSystemMXBean from com.sun instead of java.lang seemed to work fine in a quick test program, but it's not working in Solr.  I am trying this on Ubuntu Linux with OpenJDK 17 and 11.



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