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  1. Moodle
  2. MDL-41222

Course cache is rebuild unnecessarily

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 2.4.5, 2.5.1
    • 2.4.6, 2.5.2
    • Course
    • MOODLE_24_STABLE, MOODLE_25_STABLE
    • MOODLE_24_STABLE, MOODLE_25_STABLE
    • wip-MDL-41222-master
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      Prerequisites for both tests:

      1. Make sure you have several courses with activities in them and non-empty summary.
      2. Enable activity names filter (should be enabled by default)
      3. Set frontpage to display list of courses

      Test 1. Regressions:

      1. Enrol student in multiple courses
      2. View frontpage, /my/ page, individual courses, make sure there are no glitches.
      3. As teacher make changes to the course, view all courses pages again.

      Test 2. Performance:

      Significant performance improvement is noticeable on 2.5 and master since activity names filter was acting differently on 2.4

      1. Wait for 2 minutes (filters cache lifetime)
      2. Open the frontpage with the list of courses.
      3. Look at performance information, should be significantly less DB queries after the patch than before
      Show
      Prerequisites for both tests: Make sure you have several courses with activities in them and non-empty summary. Enable activity names filter (should be enabled by default) Set frontpage to display list of courses Test 1. Regressions: Enrol student in multiple courses View frontpage, /my/ page, individual courses, make sure there are no glitches. As teacher make changes to the course, view all courses pages again. Test 2. Performance: Significant performance improvement is noticeable on 2.5 and master since activity names filter was acting differently on 2.4 Wait for 2 minutes (filters cache lifetime) Open the frontpage with the list of courses. Look at performance information, should be significantly less DB queries after the patch than before

    Description

      If frontpage shows the list of courses and they have summaries, displaying the course summaries calls format_text which (if filters are not cached) calls acitivitynames filter which calls get_fast_modinfo($courseid).

      In this case course cache gets rebuilt unnecessarily

      Attachments

        Issue Links

          blocks

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. MDL-34397 Develop course structure caching

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

          Activity

            People

              marina Marina Glancy
              marina Marina Glancy
              Andrew Lyons Andrew Lyons
              Dan Poltawski Dan Poltawski
              Sam Hemelryk Sam Hemelryk
              Amaia Anabitarte, Carlos Escobedo, Ferran Recio, Ilya Tregubov, Laurent David, Raquel Ortega, Sara Arjona (@sarjona)
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              Dates

                Created:
                Updated:
                Resolved:
                9/Sep/13