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  1. Lustre
  2. LU-6658

single stream write performance improvement with worker threads in llite

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Details

    • New Feature
    • Resolution: Fixed
    • Major
    • None
    • Lustre 2.7.0, Lustre 2.8.0
    • 9223372036854775807

    Description

      This patch provides single stream write performance improvement with multiple worker threads in llite layer. its operation overvies is the following

      In system call context
      1) get a worker thread's lu_env
      2) assemble and set parameters
      2-1) copy user buffer to kernel buffer
      2-2) copy parameters needed for worker thread to resume I/O
      2-3) set parameters to the lu_env gotten in (1)
      2-4) set extra parameters to an I/O item, iosvc_item
      3) inform worker thread: ll_iosvc, we got ready.
      4) return immediately

      In worker thread context
      1) wake up
      2) gathering information
      2-1) refer its own lu_env to know the parameters set by syscall
      2-2) refer the item made in (2-3)
      3) resume I/O
      4) sleep

      I attached the performance to compare the original Lustre-2.7.52 and this custom Lustre-2.7.52

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              dmiter Dmitry Eremin (Inactive)
              nozaki Hiroya Nozaki (Inactive)
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                Created:
                Updated:
                Resolved: