I added google test's xml output into a post-build step on Jenkins, you can see the slowest tests if you sort the time column:
https://builds.apache.org/view/M-R/view/Mesos/job/Mesos-Trunk-Ubuntu-Build-Out-Of-Src-Disable-Java-Disable-Python-Disable-Webui/2391/testReport/(root)/ Ian's reaper patch should shave off much of the wasted time waiting for the reaper: https://reviews.apache.org/r/25947/
