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  1. Core Server
  2. SERVER-20426

mongoperf is producing questionable results

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    • Type: Icon: Bug Bug
    • Resolution: Won't Fix
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Tools
    • None
    • Product Performance
    • ALL
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      1) Setup CentOS 6.5 and Ubuntu 14.04 VMs on Azure
      2) Install MongoDB 3.0.6 on both VMs
      3) run mongoperf tests
      4) run fio test
      5) compare results

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      1) Setup CentOS 6.5 and Ubuntu 14.04 VMs on Azure 2) Install MongoDB 3.0.6 on both VMs 3) run mongoperf tests 4) run fio test 5) compare results

      I found a problem with the output with mongperf. In comparing the performance of CentOS 6.5 and Ubuntu 14.04 on Azure, I discovered that mongoperf's results were questionable. With 32 threads, mongperf was reporting that Ubuntu 14.04 was handling 120X mote IOps than CentOS 6.5. However, a like test using FIO does not reach the same results.

        1. C_vs_U_32_T_IOps.png
          C_vs_U_32_T_IOps.png
          297 kB
        2. Ubuntu_32_data.csv
          5 kB
        3. CentOS_32_data.csv
          4 kB
        4. C_fio_32T_rand_rw.txt
          68 kB
        5. U_fio_32T_rand_rw.txt
          67 kB
        6. C_fio-test.fio
          0.2 kB
        7. U_fio-test.fio
          0.1 kB

            Assignee:
            backlog-server-perf [DO NOT USE] Backlog - Performance Team
            Reporter:
            steven.hand Steven Hand
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              Created:
              Updated:
              Resolved: