cf-natali opened a new pull request #391:
URL: https://github.com/apache/mesos/pull/391


   If the locale is such that `LC_NUMERIC` uses the comma ',' as decimal
   separator, parsing floating point fields won't work, so make sure it's
   set to `C`.
   
   Example:
   ```
   [ RUN      ]
   CgroupsAnyHierarchyWithPerfEventTest.ROOT_CGROUPS_PERF_PerfTest
   ../../src/tests/containerizer/cgroups_tests.cpp:1024: Failure
   (statistics).failure(): Failed to parse perf sample: Failed to parse
   perf sample line
   '6376827291,,cycles,mesos_test,2011741096,100,00,3,GHz': Unexpected
   number of fields (9)
   [  FAILED  ]
   CgroupsAnyHierarchyWithPerfEventTest.ROOT_CGROUPS_PERF_PerfTest (2157
   ms)
   ```
   
   Standalone separator, using '/' as separator for readability:
   ```
   root@thinkpad:~# LC_NUMERIC=fr_FR.UTF-8 perf stat --field-separator "/"
   -- true
   0,31/msec/task-clock/306721/100,00/0/CPUs utilized
   0//context-switches/306721/100,00/0/K/sec
   0//cpu-migrations/306721/100,00/0/K/sec
   44//page-faults/306721/100,00/0/M/sec
   788234//cycles/311478/100,00/2/GHz
   538077//instructions/311478/100,00/0/insn per cycle
   106749//branches/311478/100,00/348/M/sec
   4556//branch-misses/311478/100,00/4/of all branches
   ```


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