[jira] [Created] (MESOS-5075) Remain processes when running perf event related test cases

["haosdent (JIRA)" <ji...@apache.org>]

haosdent created MESOS-5075:
-------------------------------

             Summary: Remain processes when running perf event related test cases
                 Key: MESOS-5075
                 URL: https://issues.apache.org/jira/browse/MESOS-5075
             Project: Mesos
          Issue Type: Bug
            Reporter: haosdent
            Assignee: haosdent


Currently when running single perf event related test cases, I always saw
{code}
[----------] Global test environment tear-down
../../src/tests/environment.cpp:790: Failure
Failed
Tests completed with child processes remaining:
-+- 22886 /home/haosdent/mesos/build/src/.libs/mesos-tests --gtest_filter=CgroupsIsolatorTest.ROOT_CGROUPS_PerfEventSubsystemSample --verbose
 \-+- 22963 /home/haosdent/mesos/build/src/.libs/mesos-tests --gtest_filter=CgroupsIsolatorTest.ROOT_CGROUPS_PerfEventSubsystemSample --verbose
   \-+- 22965 perf stat --all-cpus --field-separator , --log-fd 1 --event cycles --cgroup mesos/5f02f820-cc63-471b-98b9-37bbc4fde674 --event task-clock --cgroup mesos/5f02f820-cc63-471b-98b9-37bbc4fde674 -- sleep 0.25
     \--- 22966 sleep 0.25
[==========] 1 test from 1 test case ran. (3165 ms total)
{code}

In {{PerfEventIsolatorTest.ROOT_CGROUPS_Sample}}, we add a sleep.
{code}
sleep(2);
{code}

This could avoid the remain processes in most cases, but a better approach is to discard and kill perf sample process before exit.

As discussion in [r43284 | https://reviews.apache.org/r/43284/], discard did't work as well except waiting for process exit. So need to investigate why discard didn't work and fix it.



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