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Hi Håkon,<br>
<br>
Darshan is configured to automatically filter out access to certain
types of file systems, one of which is tmpfs. If you look in the
darsan-runtime/lib/darshan-mpi-io.c file, there is a statement that
looks like this:<br>
<br>
static char* fs_exclusions[] = {<br>
"tmpfs",<br>
"proc",<br>
"sysfs",<br>
"devpts",<br>
"binfmt_misc",<br>
...<br>
<br>
If you delete the "tmpfs" line and recompile Darshan then it should
pick up the access to /dev/shm just like any other file system.<br>
<br>
Unfortunately this is hard coded right now, but we can make this
configurable in the future.<br>
<br>
thanks,<br>
-Phil<br>
<br>
On 06/19/2012 02:50 AM, Håkon Strandenes wrote:
<blockquote cite="mid:4FE02131.7070002@stud.ntnu.no" type="cite">Hello,
<br>
<br>
I am trying to profile OpenFOAM (<a class="moz-txt-link-freetext" href="http://www.openfoam.com/">http://www.openfoam.com/</a>) with
Darshan. This seems to work pretty good, although I have
encountered a little problem that I hope you could help me with:
<br>
<br>
I am trying to write the data from each process to /dev/shm to
reduce the total filesystem IO (witch seems to be a bottleneck in
some cases). The problem is that Darshan does not capture this
data, and report 0 MB written to an unknown filesystem. See
attached PDFs. The case is identical except that in the first case
(Normal.pdf) all processes writes data to /home, and in the last
case (DEV-SHM.pdf) only a few files are read from /home, and the
rest is read and written from /dev/shm.
<br>
<br>
Does any of you have some ideas why Darshan does not capture the
data written to/from /dev/shm?
<br>
<br>
I have tried doing this on my workstation, with another version of
OpenFOAM (newer), and the same thing happens. OpenFOAM and Darshan
is in both cases compiled with the same compiler, Intel and GNU
respectivly.
<br>
<br>
Best regards,
<br>
Håkon Strandenes
<br>
Norwegian University of Science and Technology
<br>
<br>
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