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  1. MariaDB Server
  2. MDEV-5746

Slow file extend when innodb_use_fallocate=1 and SSD file storage

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Fixed
    • 5.5.36, 10.0.8
    • 5.5.37, 10.0.9
    • None
    • None
    • Fusion-IO SSD

    Description

      Currently size is set like:

      current_size = 0;
      desired_size = (ib_int64_t)size + (((ib_int64_t)size_high) << 32);

      #ifdef HAVE_POSIX_FALLOCATE
      if (srv_use_posix_fallocate) {

      if (posix_fallocate(file, current_size, desired_size) == -1) {

      Thus file size is always extended from offset 0 to desired offset. This is clearly slower than doing

      posix_fallocate(real_current_size, desired_size)

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-5878 Failing assertion: mutex_own(mutex) with innodb_use_fallocate=ON

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11520 Extending an InnoDB data file unnecessarily allocates a large memory buffer on Windows

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14244 MariaDB 10.2.10 fails to run on Debian Stretch with ext3 and O_DIRECT

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Activity

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              jplindst Jan Lindström (Inactive)
              jplindst Jan Lindström (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:

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