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That massive filesystem thread

That massive filesystem thread

Posted Apr 2, 2009 0:37 UTC (Thu) by davecb (subscriber, #1574)
In reply to: That massive filesystem thread by bakterie
Parent article: That massive filesystem thread

How do filesystems other than ext3/4 do it?

Well, the Unix v6 filesystem implemented
in-order writes, as did 4.x BSD and the
other pre-journaled filesystems. POSIX allows
reordering to make coalesence easy, as
a lot of research was being done at that
time to get better performance.

A colleague at ICL (hi, Ian!) did his
masters at UofT on that, and found you
could get a performance improvement
and still preserve correctness by using
what I'd characterize as tsort(1), which
worked better than BSD/Solaris soft updates.


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