no, for the time being I'm stuck with this version... Regards, Alvaro.
On Fri, Aug 21, 2009 at 4:57 AM, Oleg Drokin <[email protected]> wrote: > Hello! > > Any chance you can use more modern release like 1.8.1? There was a number > of bugs fixed including some readahead-logic fixes that could impede read > performance. > > Bye, > Oleg > > On Aug 20, 2009, at 10:38 PM, Alvaro Aguilera wrote: > > Thanks for pointing that out. I was using the default striping, which in >> my case is 1mb stripes, on one OST. >> >> However, If I change the stripe size to 32mb (the size of the buffers >> being written/read), the function used to write the file using O_DIRECT >> stops working. Its code is very similar to the one posted above and the >> problem is that the write()-function stucks while writing the first buffer. >> Is there any trick for using O_DIRECT in Lustre? I've aligned the buffer >> using posix_memalign(), and every offset and count seem to be a multiple of >> the page-size (4kb). >> >> >> >> >> >> On Fri, Aug 21, 2009 at 12:04 AM, Brian J. Murrell <[email protected]> >> wrote: >> 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. >> >> >> _______________________________________________ >> Lustre-discuss mailing list >> [email protected] >> http://lists.lustre.org/mailman/listinfo/lustre-discuss >> >> >> _______________________________________________ >> Lustre-discuss mailing list >> [email protected] >> http://lists.lustre.org/mailman/listinfo/lustre-discuss >> > >
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