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  1. Couchbase Python Client Library
  2. PYCBC-1037

SDK3(patch set) kv and query latency ~30% higher than SDK2 with external libcouchbase installed

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 3.0.1
    • None
    • None
    • 1
    • SDK48: FTS Score/Incl, Docs., SDK51: FLEpt1, Txns Test Compl, SDK2: FLEpt2, TxnsTest, SDK4: 3.1GA,Ruby3.1,TxnTst,FLE

    Description

      Comparing SDK3 to SDK2 kv get/set latency, we see that across all latency percentiles, SDK3 is ~20-30% higher than SDK2. Here are the two tests for comparison:

      SDK 2.5.0 - 24 workers:

      http://perf.jenkins.couchbase.com/job/ares/17051/

      SDK 3 - 24 workers:

      http://perf.jenkins.couchbase.com/job/ares/17049/ 

      In both tests, kv ops are against default scope/collection.

      SDK3 is this patch: git+http://review.couchbase.org/couchbase-python-client@refs/changes/91/135991/3

      Here is a comparison graph:

      http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=ares_700-3090_access_c015&label=sdk2(24workers)&snapshot=ares_700-3090_access_ae94&label=sdk3(24workers)

      The only difference in these tests, other than sdk version, cur_connections to bucket and ESTABILSHED connections to master node 172.23.133.13. Perhaps these "extra" connections are causing the slow down as the "extra" connections is around 30% more than sdk2 which corresponds to the increase in latency

      Workaround

      Remove any externally installed libcouchbase releases from the system. When run with the built-in libcouchbase, the higher latency is not observed.

      Attachments

        1. profile003.gif
          profile003.gif
          185 kB
        2. sdk2.kv.reads.repeated.perf.data
          31.04 MB
        3. sdk2.perf.data
          34.09 MB
        4. sdk3.kv.reads.repeated.3.perf.data
          36.92 MB
        5. sdk3.perf.data
          32.77 MB
        6. sdk3withlcb293.data
          425 kB
        7. sdk3withlcb306.data
          150 kB
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            david.kelly David Kelly
            korrigan.clark Korrigan Clark (Inactive)
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            Dates

              Created:
              Updated:
              Resolved:

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