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Diffstat (limited to 'HOWTO')
| -rw-r--r-- | HOWTO | 30 |
1 files changed, 30 insertions, 0 deletions
@@ -1705,6 +1705,36 @@ Buffers and memory this option will also enable :option:`refill_buffers` to prevent every buffer being identical. +.. option:: dedupe_mode=str + + If ``dedupe_percentage=<int>`` is given, then this option controls how fio + generates the dedupe buffers. + + **repeat** + Generate dedupe buffers by repeating previous writes + **working_set** + Generate dedupe buffers from working set + + ``repeat`` is the default option for fio. Dedupe buffers are generated + by repeating previous unique write. + + ``working_set`` is a more realistic workload. + With ``working_set``, ``dedupe_working_set_percentage=<int>`` should be provided. + Given that, fio will use the initial unique write buffers as its working set. + Upon deciding to dedupe, fio will randomly choose a buffer from the working set. + Note that by using ``working_set`` the dedupe percentage will converge + to the desired over time while ``repeat`` maintains the desired percentage + throughout the job. + +.. option:: dedupe_working_set_percentage=int + + If ``dedupe_mode=<str>`` is set to ``working_set``, then this controls + the percentage of size of the file or device used as the buffers + fio will choose to generate the dedupe buffers from + + Note that size needs to be explicitly provided and only 1 file per + job is supported + .. option:: invalidate=bool Invalidate the buffer/page cache parts of the files to be used prior to |