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SegmentedLog should coalesce adjacent fdatasync calls #165

ongardie opened this Issue Jun 5, 2015 · 0 comments


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ongardie commented Jun 5, 2015

In SegmentedLog, write + fdatasync + write + fdatasync for the same file descriptor should be merged into write + write + fdatasync. This was lost in the cleanup before it got merged, and it's really important for performance.

@ongardie ongardie added the perf label Jun 5, 2015

@ongardie ongardie self-assigned this Jun 5, 2015

@ongardie ongardie closed this in cd820cb Jun 5, 2015

nhardt pushed a commit to nhardt/logcabin that referenced this issue Aug 21, 2015

Optimize SegmentedLog to elide common fdatasync calls
This should help a lot with disk performance (though I haven't
benchmarked it).

Close logcabin#165: SegmentedLog should coalesce adjacent fdatasync calls
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