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  1. Moodle
  2. MDL-65321

Memory used and files included increase detected in all course view requests

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    Details

    • Testing Instructions:
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      1) Enable $CFG->enableasyncbackup

      2) Before patch, measure memory usage of course view page, with warm caches eg load a couple times. Do this for view page and with settings on

      3) Now apply patch.

      4) Re test memory when viewing the page with editing off, memory should be lower

      5) Turn editing on, memory should be higher pulling in the extra libs

      6) Disable $CFG->enableasyncbackup

      7) Re test course with editing still on, memory should be lower with libs not loaded

       

       

       

       

       

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      1) Enable $CFG->enableasyncbackup 2) Before patch, measure memory usage of course view page, with warm caches eg load a couple times. Do this for view page and with settings on 3) Now apply patch. 4) Re test memory when viewing the page with editing off, memory should be lower 5) Turn editing on, memory should be higher pulling in the extra libs 6) Disable $CFG->enableasyncbackup 7) Re test course with editing still on, memory should be lower with libs not loaded          
    • Affected Branches:
      MOODLE_37_STABLE
    • Fixed Branches:
      MOODLE_37_STABLE
    • Pull from Repository:
    • Pull Master Branch:
      MDL-65321-course-perf
    • Pull Master Diff URL:

      Description

      This is a regression introduced by MDL-28505 (master only) and should be fixed before 3.7 release (aka, must fix).

      Our performance comparison scripts detected a 6% memory increase in all course view requests. Problem was traced down to the new async backups option where, irrespectively of them being enabled or no (site-wide setting), the increase happens.

      In Rex Lorenzo wise words:

      I see the increased in files being included is because of the notification for a pending async here:
      https://github.com/moodle/moodle/compare/master...mattporritt:master_MDL-28505_Asynchronous_backup_and_restore#diff-74f014905906a752b55944bb01490677R8

      So, we should not be including all the backup machinery unconditionally, the check should be really lighter, specially when the feature is disabled (also when enabled).

      That's it, ciao

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          is a regression caused by

          New Feature - A new Moodle feature which has yet to be developed. MDL-28505 Asynchronous course backup / restore

          • Critical - Crashes server, loss of data, severe memory leak
          • Closed

            Activity

              People

              Assignee:
              brendanheywood Brendan Heywood
              Reporter:
              stronk7 Eloy Lafuente (stronk7)
              Peer reviewer:
              Matt Porritt
              Integrator:
              Eloy Lafuente (stronk7)
              Tester:
              Eloy Lafuente (stronk7)
              Participants:
              Component watchers:
              Adrian Greeve, Jake Dallimore, Mathew May, Mihail Geshoski, Peter Dias, Matteo Scaramuccia, Andrew Nicols, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze
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              5 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                Fix Release Date:
                20/May/19

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