Details

    • Improvement
    • Resolution: Duplicate
    • Minor
    • None
    • Lustre 2.10.0
    • 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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            [LU-8709] parallel asynchronous readahead
            adilger Andreas Dilger made changes -
            Resolution New: Duplicate [ 3 ]
            Status Original: Reopened [ 4 ] New: Resolved [ 5 ]
            pfarrell Patrick Farrell (Inactive) made changes -
            Link New: This issue is related to LU-12043 [ LU-12043 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is related to LU-11416 [ LU-11416 ]
            sihara Shuichi Ihara made changes -
            Labels Original: Performance New: perf_optimization
            sihara Shuichi Ihara made changes -
            Labels New: Performance
            pjones Peter Jones made changes -
            Assignee Original: Li Xi [ lixi ] New: Li Xi [ lixi_wc ]
            ihara Shuichi Ihara (Inactive) made changes -
            Attachment New: Lustre-SingleThread.png [ 30068 ]
            pjones Peter Jones made changes -
            Fix Version/s Original: Lustre 2.10.0 [ 12204 ]
            lixi Li Xi (Inactive) made changes -
            Resolution Original: Duplicate [ 3 ]
            Status Original: Resolved [ 5 ] New: Reopened [ 4 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is duplicated by LU-6 [ LU-6 ]

            People

              lixi_wc Li Xi
              adilger Andreas Dilger
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              Dates

                Created:
                Updated:
                Resolved: