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Date: Fri, 8 Jan 2016 16:20:40 +0000 (UTC)
From: "Jan Schlicht (JIRA)" <jira@apache.org>
To: issues@mesos.apache.org
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Subject: [jira] [Commented] (MESOS-3082) Perf related tests rely on 'cycles'
 which might not always be present.
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    [ https://issues.apache.org/jira/browse/MESOS-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089443#comment-15089443 ] 

Jan Schlicht commented on MESOS-3082:
-------------------------------------

Tests trying to sample using perf with the 'cycles' value can cause failures of other tests if run on a virtual machine that does not support _CPU performance counters_. E.g. running {{sudo ./bin/mesos-tests.sh --gtest_filter="*ROOT_CGROUPS_Sample"}} will fail and sometimes keep a child process running. This process will block some cgroups from being removed. This affects all test processes that are run afterwards that try to clean up some cgroups before being run (mostly {{ROOT_CGROUPS_*}}).

I'd suggest to disable these test if in a virtual machine without _CPU performance counters_.

> Perf related tests rely on 'cycles' which might not always be present.
> ----------------------------------------------------------------------
>
>                 Key: MESOS-3082
>                 URL: https://issues.apache.org/jira/browse/MESOS-3082
>             Project: Mesos
>          Issue Type: Bug
>         Environment: Ubuntu 14.04 (in a virtual machine)
>            Reporter: Benjamin Hindman
>              Labels: mesosphere
>
> When running the tests on Ubuntu 14.04 the 'cycles' value collected by perf is always 0, meaning certain tests always fail. These lines in the test have been commented out for now and a TODO has been attached which links to this JIRA issue, since the solution is unclear. In particular, 'cycles' might not properly be counted because it is a hardware counter and this particular machine was a virtual machine. Either way, we should determine the best events to collect from perf in either VM or physical settings.


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