[JIRA] (OVIRT-910) mock_runner.sh seems to run slower on newer slaves

[Barak Korren (oVirt JIRA)]

    [ https://ovirt-jira.atlassian.net/browse/OVIRT-910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=23926#comment-23926 ] 

Barak Korren commented on OVIRT-910:
------------------------------------

the problem with logs is that you need to get then "hot" be cause they may disappear fast...

Older slave log (fc24-vm15.phx.ovirt.org):
http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc24-x86_64/5915/
{code}
...
12:01:51 Start: unpacking root cache
12:02:06 Finish: unpacking root cache
...
12:02:07 Init took 17 seconds
{code}


Newer slave log (vm0125.workers-phx.ovirt.org):
http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc24-x86_64/5916/
{code}
...
12:04:19 Start: unpacking root cache
12:05:15 Finish: unpacking root cache
...
12:05:16 Init took 57 seconds
{code}

Then again, on (newer) vm0130.workers-phx.ovirt.org:
http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc24-x86_64/5916/
{code}
...
12:02:45 Start: unpacking root cache
12:03:09 Finish: unpacking root cache
...
12:03:09 Init took 24 seconds
{code}

So not a 100% consistent result, still, we should find out how to get those 40 seconds back...

BTW I was sure the local disk was mounted on older slaves with noatime, looks like that is not the case, maybe we should fix that...

> mock_runner.sh seems to run slower on newer slaves
> --------------------------------------------------
>
>                 Key: OVIRT-910
>                 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-910
>             Project: oVirt - virtualization made easy
>          Issue Type: Improvement
>          Components: Jenkins
>            Reporter: Barak Korren
>            Assignee: infra
>
> After implementing speedup improvements for mock_runner.sh (Specifically enabling it to deploy the chroot by extracting a tarball as opposed to installing it with yum every time), I started monitoring run times for vdsm check_patch jobs.
> I've noticed that jobs that are running on the old slaves (fc24-vm*) seem to initialize mock faster then ones running on new slaves (vm*) - 17seconds vs 57 seconds respectively.
> I suspect this may be because the older slaves have a different FS mounted on /var/cache/mock



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