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Posted to issues@solr.apache.org by "Shawn Heisey (Jira)" <ji...@apache.org> on 2023/01/02 20:41:00 UTC
[jira] [Commented] (SOLR-16605) CPU in UI cloud->nodes is always 0%, even when Solr is very busy.
[ https://issues.apache.org/jira/browse/SOLR-16605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653689#comment-17653689 ]
Shawn Heisey commented on SOLR-16605:
-------------------------------------
If I just do the javascript change, that seems to produce the same results as the whole patch. Sometimes it shows a nonzero CPU usage, mostly it shows 0%. I will go ahead and commit the javascript change shortly, because what's there currently is wrong, as the returned value from the bean is in the range of 0-1, not 0-100.
My little test program looks like the processCpuLoad method is returning the correct value on every run, so I am very confused about why Solr is reporting 0% most of the time.
> 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
> Priority: Major
> 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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