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  1. MariaDB Server
  2. MDEV-3780

LP:725596 - Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size={16K,32K}

        Details

        • Type: Task
        • Status: Closed
        • Priority: Minor
        • Resolution: Won't Fix
        • Fix Version/s: None
        • Component/s: None

          Description

          The Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size=

          {16K,32K}

          . This prevents this particular combination of values (low page cache, large pages) to be tested.

          To repeat:

          MTR_VERSION=1 perl mysql-test-run.pl -mysqld=maria-pagecache-buffer-size=128K --start-and-exit 1st --mysqld=-maria-block-size=16K

          the error log says:

          110226 18:38:40 [ERROR] mysqld: Not enough memory to allocate 8 pagecache pages
          110226 18:38:40 [ERROR] Plugin 'MARIA' init function returned error.
          110226 18:38:40 [ERROR] Plugin 'MARIA' registration as a STORAGE ENGINE failed.

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                philipstoev Philip Stoev added a comment -

                Re: Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size=

                {16K,32K}

                16K pages work with 256K cache
                32K pages work with 512K cache

                However, testing with 128K cache would produce a higher number of cache misses and disk I/O.

                Show
                philipstoev Philip Stoev added a comment - Re: Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size= {16K,32K} 16K pages work with 256K cache 32K pages work with 512K cache However, testing with 128K cache would produce a higher number of cache misses and disk I/O.
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                monty Michael Widenius added a comment -

                Re: Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size=

                {16K,32K}

                This is as expected. Aria needs at least 8 full blocks to work reliable. The reason that 128K is not enough is that some part of the page cache memory goes to managing the blocks.

                Fix: use --aria-block-size=16K --aria-pagecache-buffer-size=140K

                Show
                monty Michael Widenius added a comment - Re: Aria engine does not start with --maria-pagecache-buffer-size=128K --maria-block-size= {16K,32K} This is as expected. Aria needs at least 8 full blocks to work reliable. The reason that 128K is not enough is that some part of the page cache memory goes to managing the blocks. Fix: use --aria-block-size=16K --aria-pagecache-buffer-size=140K
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                ratzpo Rasmus Johansson added a comment -

                Launchpad bug id: 725596

                Show
                ratzpo Rasmus Johansson added a comment - Launchpad bug id: 725596

                  People

                  • Assignee:
                    monty Michael Widenius
                    Reporter:
                    philipstoev Philip Stoev
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                    Dates

                    • Created:
                      Updated:
                      Resolved: