I don't know how it affects solr, but if you're interested in java's support to detect cgroup/container limits on cpu/memory etc, you can use these links as starting points to investigate. It affect some jvm configuration, like initial GC selection & settings that can affect performance. It was only backported to java 8 quite recently, so if you're still on that might want to check if you're on the latest version.
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8146115 https://bugs.openjdk.java.net/browse/JDK-8264136 On Thu, Mar 17, 2022, at 01:11, Vincenzo D'Amore wrote: > Hi Shawn, thanks for your help. > > Given that I’ll put the question in another way. > If Java don’t correctly detect the number of CPU how the overall > performance can be affected by this? > > Ciao, > Vincenzo > > -- > mobile: 3498513251 > skype: free.dev > >> On 16 Mar 2022, at 18:56, Shawn Heisey <elyog...@elyograg.org> wrote: >> >> On 3/16/22 03:56, Vincenzo D'Amore wrote: >>> just asking how can I rely on the number of processors the solr dashboard >>> shows. >>> >>> Just to give you a context, I have a 2 nodes solrcloud instance running in >>> kubernetes. >>> Looking at solr dashboard (8.3.0) I see there is only 1 cpu available per >>> solr instance. >>> but the Solr pods are deployed in two different kube nodes, and entering >>> the pod with the >>> kubectl exec -ti solr-0 -- /bin/bash >>> and running top I see there are 16 cores available for each solr instance. >> >> The dashboard info comes from Java, and Java gets it from the OS. How that >> works with containers is something I don't know much about. Here's what >> Linux says about a server I have which has two six-core Intel CPUs with >> hyperthreading. This is bare metal, not a VM or container: >> >> elyograg@smeagol:~$ grep processor /proc/cpuinfo >> processor : 0 >> processor : 1 >> processor : 2 >> processor : 3 >> processor : 4 >> processor : 5 >> processor : 6 >> processor : 7 >> processor : 8 >> processor : 9 >> processor : 10 >> processor : 11 >> processor : 12 >> processor : 13 >> processor : 14 >> processor : 15 >> processor : 16 >> processor : 17 >> processor : 18 >> processor : 19 >> processor : 20 >> processor : 21 >> processor : 22 >> processor : 23 >> >> If I start Solr on that server, the dashboard reports 24 processors. >> >> Thanks, >> Shawn >>
