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  1. MariaDB Server
  2. MDEV-5746

Slow file extend when innodb_use_fallocate=1 and SSD file storage

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 5.5.36, 10.0.8
    • Fix Version/s: 5.5.37, 10.0.9
    • Component/s: None
    • Labels:
      None
    • Environment:
      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)

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              • Assignee:
                jplindst Jan Lindström
                Reporter:
                jplindst Jan Lindström
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                • Due:
                  Created:
                  Updated:
                  Resolved: