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  1. Lustre
  2. LU-19737

Minor performance regression in directory removal operations

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Details

    • Bug
    • Resolution: Unresolved
    • Medium
    • Lustre 2.18.0
    • Lustre 2.17.0
    • None
    • 3
    • 9223372036854775807

    Description

      We observed an approximately 10% regression in directory removal performance in Lustre 2.17.0 compared to 2.16.1.
      In a single-client, single-process mdtest workload, directory removal throughput decreased from ~5300 ops/sec (2.16.1) to ~4800 ops/sec (2.17.0). Here is test results.

      Test workload:

      $ mpirun -np 1 mdtest -i 3 -p 10 -n 160000 -vv -u -d /lustre/d0/d1/d2/mdtest.out -C -r -D
      

      server: 2.17.0, client: 2.17.0

      SUMMARY rate: (of 3 iterations)
         Operation                     Max            Min           Mean        Std Dev
         ---------                     ---            ---           ----        -------
         Directory creation           7518.939       7429.562       7467.942         46.005
         Directory stat                  0.000          0.000          0.000          0.000
         Directory rename                0.000          0.000          0.000          0.000
         Directory removal            4784.520       4734.104       4761.403         25.467
      

      server: 2.17.0, client: 2.16.1

      SUMMARY rate: (of 3 iterations)
         Operation                     Max            Min           Mean        Std Dev
         ---------                     ---            ---           ----        -------
         Directory creation           7642.558       7491.665       7568.660         75.494
         Directory stat                  0.000          0.000          0.000          0.000
         Directory rename                0.000          0.000          0.000          0.000
         Directory removal            4817.479       4788.654       4798.284         16.624
      

      server: 2.16.1, client: 2.16.1

      SUMMARY rate: (of 3 iterations)
         Operation                     Max            Min           Mean        Std Dev
         ---------                     ---            ---           ----        -------
         Directory creation           7730.476       7471.599       7606.341        129.764
         Directory stat                  0.000          0.000          0.000          0.000
         Directory rename                0.000          0.000          0.000          0.000
         Directory removal            5347.471       5300.265       5329.483         25.528
      

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            wc-triage WC Triage
            sihara Shuichi Ihara
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              Created:
              Updated: