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  1. Lustre
  2. LU-12071

bypass pagecache for large files

Details

    • Improvement
    • Resolution: Fixed
    • Minor
    • Lustre 2.14.0
    • None
    • None
    • 9223372036854775807

    Description

      pagecache invalidation is quite expensive:

      pagecache enabled:

      ost  1 sz 268435456K rsz 16384K obj   16 thr   64 write 5094.16 [2287.82, 6383.46] read 5295.85 [5039.42, 5567.47]

      pagecache disabled:

      ost  1 sz 268435456K rsz 16384K obj   16 thr   64 write 4460.22 [3615.59, 5151.63] read 5218.00 [4847.41, 5551.34]

      we do already have a mechanism to bypass pagecache in place, just need to use that properly.

      Attachments

        Issue Links

          is duplicated by

          Improvement - An improvement or enhancement to an existing feature or task. LU-11341 Do not use pagecache for I/O

          • Critical - Crashes, loss of data, severe memory leak.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-12346 ladvise willread should work even if OSD cache is disabled

          • 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-12016 sanity: test_156 Error: ''IN CACHE: before: 8255, after: 8258''

          • 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-13680 large allocations in osd_bufs_get() failing

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

          Improvement - An improvement or enhancement to an existing feature or task. LU-12179 allocate continuous pages when disabled page caches

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

          Bug - A problem which impairs or prevents the functions of the product. LU-410 Performance concern with Shrink file_max_cache_size to alleviate the memory pressure of OST patch for LU-15

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-11347 Do not use pagecache for SSD I/O when read/write cache are disabled

          • Major - Major loss of function.
          • Resolved

          Activity

            [LU-12071] bypass pagecache for large files
            adilger Andreas Dilger made changes -
            Link New: This issue is related to LU-12016 [ LU-12016 ]
            chunteraa Chris Hunter (Inactive) made changes -
            Link New: This issue is related to EX-1625 [ EX-1625 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is duplicated by LU-11341 [ LU-11341 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is related to LU-13680 [ LU-13680 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is related to LU-12179 [ LU-12179 ]
            adilger Andreas Dilger made changes -
            Link New: This issue is related to DDN-1143 [ DDN-1143 ]
            pjones Peter Jones made changes -
            Link Original: This issue is related to JFC-10 [ JFC-10 ]
            pjones Peter Jones made changes -
            Link Original: This issue is related to JFC-17 [ JFC-17 ]
            pjones Peter Jones made changes -
            Link Original: This issue is related to JFC-19 [ JFC-19 ]
            pjones Peter Jones made changes -
            Link New: This issue is related to JFC-17 [ JFC-17 ]

            People

              bzzz Alex Zhuravlev
              bzzz Alex Zhuravlev
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              Dates

                Created:
                Updated:
                Resolved: