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Assuming users have no issues with the pre-release, this workaround
will be generally available starting in Darshan 3.1.5, which we can
probably release officially within the next few weeks. <br>
<br>
--Shane<br>
<br>
<div class="moz-cite-prefix">On 10/31/2017 11:35 AM, Shane Snyder
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:052d31fb-05ee-88c3-5f5b-d4209ba97c87@mcs.anl.gov">
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Hi Wadud,<br>
<br>
It looks like you are trying to run one of the NAS benchmark
codes, which I believe are Fortran programs, right?<br>
<br>
This is due to a known "issue" with OpenMPI2 where the Fortran
bindings are calling PMPI_ routines directly, bypassing Darshan's
use of the MPI profiling interface (PMPI). Basically, Darshan is
unable to intercept any MPI calls, including MPI_Init/Finalize
which is where Darshan initializes its data structures and does
the generation of the log file, respectively. No error is
generated for the same reason: Darshan never initializes itself
and doesn't think it should be instrumenting anything. If
interested in more details, check out this github issue: <a
class="moz-txt-link-freetext"
href="https://github.com/open-mpi/ompi/issues/3954"
moz-do-not-send="true">https://github.com/open-mpi/ompi/issues/3954</a><br>
<br>
Ignoring the philosophical question of whether the "issue" here
lies with the MPI implementation or tools that use the MPI
profiling interface (this issue affects all PMPI tools, not just
Darshan), we've actually spent some time developing a workaround
for this issue recently, so you are in luck!<br>
<br>
I have not gone through with making a pre-release version of
Darshan with this workaround publicly available, though I really
have been meaning to. I will definitely make sure to do that
today, and will send an update to this mailing list when its ready
so you (and others) are aware. So, you have a couple of options:<br>
<br>
1.) Wait for that pre-release to come out later this afternoon, or<br>
2.) Check out the master branch of the Darshan git repo (<a
class="moz-txt-link-freetext"
href="https://xgitlab.cels.anl.gov/darshan/darshan"
moz-do-not-send="true">https://xgitlab.cels.anl.gov/darshan/darshan</a>)<br>
<br>
Either should resolve the issue, but be sure to let us know if
not.<br>
<br>
Thanks,<br>
--Shane<br>
<br>
<div class="moz-cite-prefix">On 10/31/2017 10:51 AM, Wadud Miah
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AM4PR0501MB216110BBF49A164F62AD38A2C05E0@AM4PR0501MB2161.eurprd05.prod.outlook.com">
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<p>Hi everyone,</p>
<p><br>
</p>
<p>I built Darshan 3.1.4 with OpenMPI 2.0.2 and gcc 7.2.1
using the following configure flags:</p>
<p><br>
</p>
<p><span>./configure --with-mem-align=8
--with-log-path-by-env=DARSHAN_LOGPATH
--with-jobid-env=NONE CC=mpicc
--prefix=/usr/local/darshan-3.1.4-ompi</span></p>
<p><br>
</p>
<p>I have also attached the config.log file. When I run my
application with LD_PRELOAD, Darshan does not create any
trace file and neither does it complain:</p>
<p><br>
</p>
<div>[miahw@bedale bin]$ export DARSHAN_LOGPATH=.<br>
[miahw@bedale bin]$
LD_PRELOAD=/usr/local/darshan-3.1.4-ompi/lib/libdarshan.so
mpirun -n 4 ./bt.A.4.mpi_io_full <br>
</div>
<div>[ ... lots of application output ... ]<br>
<div>[miahw@bedale bin]$ ls<br>
bt.A.4 bt.A.4.mpi_io_full btio.full.out inputbt.data<br>
</div>
<div><br>
</div>
<div>As you can see, there is no trace file in the current
working directory. Any help will be greatly appreciated. <br>
</div>
</div>
<div><br>
</div>
<div>Thanks in advance,</div>
<div>Wadud.<br>
</div>
<p><br>
</p>
<div id="Signature">
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<p>---------------------------------------<br>
</p>
<p>Dr. Wadud Miah</p>
<p>Numerical Algorithms Group</p>
<p><br>
</p>
<p><br>
</p>
</div>
</div>
</div>
<br>
<br>
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