On Thu, 2009-08-20 at 23:52 +0200, Alvaro Aguilera wrote: > I'm facing the following problem: when this code is run in parallel > the read operations on certain processes start to need more and more > time to complete. I attached a graphical trace of this, when using > only 2 processes.
Just a (perhaps silly) question, but does the striping of the file (or the directory the file is being created in) on the filesystem match your I/O patterns? That is, ideally, each thread/rank/process (whatever you want to call them) should be doing I/O in it's own stripe. $ man lfs if none of this is meaningful. b.
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