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<div class="moz-cite-prefix">On 09/09/2015 10:55 AM, Chih-Song Kuo
wrote:<br>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="DE">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="DE"> <a class="moz-txt-link-abbreviated" href="mailto:darshan-users-bounces@lists.mcs.anl.gov">darshan-users-bounces@lists.mcs.anl.gov</a>
[<a class="moz-txt-link-freetext" href="mailto:darshan-users-bounces@lists.mcs.anl.gov">mailto:darshan-users-bounces@lists.mcs.anl.gov</a>] <b>Im
Auftrag von </b>Phil Carns<br>
<b>Gesendet:</b> Mittwoch, 9. September 2015 15:52<br>
<b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:darshan-users@lists.mcs.anl.gov">darshan-users@lists.mcs.anl.gov</a><br>
<b>Betreff:</b> Re: [Darshan-users] Different builds for
each MPI/compiler<o:p></o:p></span></p>
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<p class="MsoNormal">On 09/09/2015 06:55 AM, Chih-Song Kuo
wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Hello Darshan
user community,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">I just started
using Darshan. Despite it runs pretty well, I wonder if I
have to create different builds for each combination of MPI
and compiler. I had this concern because you wrote some
issues about libfmpich.so. I as a sales consultant of an
HPC-system vendor run benchmarks with many combinations of
MPI and compilers to advise our customer the best choice.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">Your insight
will be greatly appreciated.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">Chih-Song<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><br>
Hi Chih-Song,<br>
<br>
I have two pieces of information that might be helpful:<br>
<br>
a) The underlying compiler generally doesn't matter as much
as the MPI library itself. We usually compile Darshan
itself with GNU compilers for maximum compatibility; the
resulting Darshan library should be compatible with most any
compiler/linker.<br>
<br>
b) As for the MPI library, the MPICH ABI compatibility
initiative (<a moz-do-not-send="true"
href="https://www.mpich.org/abi/">https://www.mpich.org/abi/</a>)
should help in theory by making sure that quite a few of the
MPI implementations have a compatible binary interface. Our
team hasn't tested this capability first hand, so I can't
guarantee it will work, but I think the prospects are good.<br>
<br>
thanks,<br>
-Phil<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Phil,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks. It
looks like I might be worrying too much. According my
experience with IPM’s I/O profiling module, different MPIs
seem to have some difference in the appearance of the
“const” modifier which caused some trouble in the
compilation.</span></p>
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<br>
This would mainly be an issue for mixing MPI 2 and MPI 3
implementations (const correctness is part of the latter spec). I
imagine there would be more significant roadblocks to that level of
interoperability though. It's probably best to at least stick to
one major version or the other for a given Darshan build.<br>
<br>
FWIW Darshan does detect the const issue at compile time (for the
Darshan library itself), so you can build a version of Darshan for
use with either API generation.<br>
<br>
<blockquote
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<p class="MsoNormal"><span style="color:#1F497D"> Also, on <a
moz-do-not-send="true"
href="https://www.nersc.gov/users/software/debugging-and-profiling/ipm/">
<a class="moz-txt-link-freetext" href="https://www.nersc.gov/users/software/debugging-and-profiling/ipm/">https://www.nersc.gov/users/software/debugging-and-profiling/ipm/</a></a>,
there seems to be some module explicitly built for Intel
compilers. I thought Darshan uses a similar profiling
technique, so I was asking.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<br>
I don't believe this is the case. Darshan's various instrumentation
methods (link-time wrappers, PMPI, or preloading) are all
compiler-independent to my knowledge. IPM captures more in-depth
information so it may rely on additional methods.<br>
<br>
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<p class="MsoNormal"><span style="color:#1F497D">I read in some
Darshan research papers that the tool has been enabled by
default on several NERSC clusters. Do the users there have a
wide choice of MPI implementations? Do you have any clue
which MPIs are chosen by the user and also get successfully
profiled by Darshan?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<br>
I don't have that information myself, sorry. I know that Darshan
works with each of the compilers that are available (and users do
switch those for various reasons), but I'm not sure about the MPI
implementations.<br>
<br>
thanks,<br>
-Phil<br>
<br>
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<p class="MsoNormal"><span style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Chh-Song<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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