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  1. Lustre
  2. LU-6179

Lock ahead - Request extent locks from userspace

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Details

    • New Feature
    • Resolution: Fixed
    • Major
    • Lustre 2.11.0
    • None
    • 17290

    Description

      At the recent developers conference, Jinshan proposed a different method of approaching the performance problems described in LU-6148.

      Instead of introducing a new type of LDLM lock matching, we'd like to make it possible for user space to explicitly request LDLM locks asynchronously from the IO.

      I've implemented a prototype version of the feature and will be uploading it for comments. I'll explain the state of the current version in a comment momentarily.

      Attachments

        1. anl_mpich_build_guide.txt
          18 kB
          Patrick Farrell
        2. lockahead_ladvise_mpich_patch
          30 kB
          Patrick Farrell
        3. sle11_build_tools.tar.gz
          2.48 MB
          Patrick Farrell
        4. LockAhead-TestReport.txt
          1.36 MB
          Patrick Farrell
        5. LUSTRE-LockAhead-140417-1056-170.pdf
          64 kB
          Patrick Farrell
        6. cug paper.pdf
          714 kB
          Patrick Farrell
        7. mmoore cug slides.pdf
          1.15 MB
          Patrick Farrell
        8. LockAheadResults.docx
          516 kB
          Cong Xu

        Issue Links

          is blocking

          Bug - A problem which impairs or prevents the functions of the product. LU-9962 Possible file size glimpse issue

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          is related to

          Bug - A problem which impairs or prevents the functions of the product. LU-19006 cl_mode_user_to_kernel returns unsigned enum, cannot be negative

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. LU-10136 sanity test_255c: Ladvise test11 failed, 255

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. LUDOC-379 Document ladvise lockahead feature

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. LU-6181 Fix lock contention discovery to disable extend lock growth

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. LU-11618 implement ladvise rpc_size for optimized performance

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

          New Feature - A new feature of the product, which has yet to be developed. LU-6148 Strided lock proposal - Feature proposal for 2.8

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. LU-7225 change ladvise wire protocol for lockahead and future usage

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

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              paf Patrick Farrell (Inactive)
              paf Patrick Farrell (Inactive)
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              Dates

                Created:
                Updated:
                Resolved: