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  1. Core Server
  2. SERVER-12787

Strange performance characteristics of write ops in shell

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Major - P3 Major - P3
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    Description

      Running these two cases shows some unexpectedly huge discrepancy in run time:

      db.user.drop();
      for (var x = 0; x < 10000; x++) {
          db.user.insert({ x: x });
          if (!db.getMongo().useWriteCommands()) {
              db.runCommand({ getLastError: 1 });
          }
      }

      raw smoke.py: 4697 ms
      --use-write-commands: 8640 ms

      db.user.drop();
      var bulk = db.user.initializeUnorderedBulkOp();
      for (var x = 0; x < 10000; x++) {
          bulk.insert({ x: x });
      }
      bulk.execute();

      raw smoke.py: 4769 ms
      --use-write-commands: 305 ms

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            davide.italiano Davide Italiano
            randolph@mongodb.com Randolph Tan
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