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  1. Lustre
  2. LU-8709

parallel asynchronous readahead

    Details

    • Type: Improvement
    • Status: Reopened
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: Lustre 2.10.0
    • Fix Version/s: None
    • Rank (Obsolete):
      9223372036854775807

      Description

      Tracker for parallel async readahead improvement from DDN, as described in http://www.eofs.eu/_media/events/lad16/19_parallel_readahead_framework_li_xi.pdf

      Note that it would be very desirable in the single thread case if the copy_to_user was also handled in parallel, as this is a major CPU overhead on many-core systems and if it can be parallelized it may increase the peak read performance.

      As for lockahead integration with readahead, I agree that this is possible to do this, but it is only useful if the client doesn't get full-file extent locks. It would also be interesting if the write code detected sequential or strided writes and did lockahead at write time.

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              • Assignee:
                lixi_wc Li Xi
                Reporter:
                adilger Andreas Dilger
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                • Created:
                  Updated: