Derby
  1. Derby
  2. DERBY-5068

Investigate increased CPU usage on client after introduction of UTF-8 CcsidManager

    Details

    • Bug behavior facts:
      Performance, Regression

      Description

      While looking at the performance graphs for the single-record select test during the last year - http://home.online.no/~olmsan/derby/perf/select_1y.html - I noticed that there was a significant increase (10-20%) in CPU usage per transaction on the client early in October 2010. To be precise, the increase seems to have happened between revision 1004381 and revision 1004794. In that period, there were three commits: two related to DERBY-4757, and one related to DERBY-4825 (tests only).

      We should try to find out what's causing the increased CPU usage and see if there's some way to reduce it.

      1. d5068-1a.diff
        4 kB
        Knut Anders Hatlen
      2. d5068-2a.diff
        31 kB
        Knut Anders Hatlen
      3. d5068-2a.stat
        0.6 kB
        Knut Anders Hatlen
      4. d5068-2b.diff
        33 kB
        Knut Anders Hatlen

        Issue Links

          Activity

          Knut Anders Hatlen created issue -
          Knut Anders Hatlen made changes -
          Field Original Value New Value
          Attachment d5068-1a.diff [ 12477653 ]
          Knut Anders Hatlen made changes -
          Link This issue is related to DERBY-5210 [ DERBY-5210 ]
          Knut Anders Hatlen made changes -
          Attachment d5068-2a.diff [ 12478695 ]
          Attachment d5068-2a.stat [ 12478696 ]
          Knut Anders Hatlen made changes -
          Issue & fix info [Patch Available]
          Knut Anders Hatlen made changes -
          Attachment d5068-2b.diff [ 12479313 ]
          Knut Anders Hatlen made changes -
          Status Open [ 1 ] Resolved [ 5 ]
          Issue & fix info [Patch Available]
          Assignee Knut Anders Hatlen [ knutanders ]
          Fix Version/s 10.9.0.0 [ 12316344 ]
          Resolution Fixed [ 1 ]
          Knut Anders Hatlen made changes -
          Labels derby_backport_reject_10_8
          Knut Anders Hatlen made changes -
          Status Resolved [ 5 ] Closed [ 6 ]
          Gavin made changes -
          Workflow jira [ 12599903 ] Default workflow, editable Closed status [ 12801717 ]

            People

            • Assignee:
              Knut Anders Hatlen
              Reporter:
              Knut Anders Hatlen
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              Dates

              • Created:
                Updated:
                Resolved:

                Development