<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>@John: Indeed, portability is an issue, so there's no way I can compile ParaView for all users with a custom source code patch :-/ Thanks for your idea, though, if it was just for me, I'd probably go this way and be done with it.</div><div><br></div><div>@Burlen: Starting paraview with mpiexec doesn't work either (I think the client is inherently a serial application, so mpiexec -n 2 will just start the client twice). And I double checked: "Use Multi-Core" is enabled and the number of cores is set to 2, but doing an MPI_Initialized(isInit); in my plugin still yields the result that MPI was in fact NOT initialized yet.</div><div><br></div><div>I tried starting MPI in the constructor of the plugin, but that is not a good idea since the constructor is called multiple times. Also, if ParaView should (legitimately) try to start MPI afterwards, it will crash since MPI was already started. Argh, it seems like I will have to implement both I/O libraries to get around this…</div><div><br></div><div>Michael</div><div><br><div><div>On Jun 2, 2013, at 09:30 , burlen wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div class="moz-cite-prefix">that could be a fine solution if you're
not overly concerned about portability. if you did that then you
might have to use mpiexec(or whatever launcher) to start the
paraview client. (but mpich and openmpi seem to be fine without
mpiexec for 1 process runs...ymmv) you'd also be prevented from
running the client on login nodes at certain hpc sites.<br>
<br>
but wait a second...<br>
<blockquote type="cite"> Just enabling the Multi-Core option in
the ParaView settings does not seem to do the trick.</blockquote>
I think that this should work. at least my reader which can't run
without mpi works with it. Is this a recent version of ParaVIew?
Are you sure you tried on an mpi endowed build? Once you check the
multicore setting you need to restart paraview.<br>
<br>
<br>
On 06/01/2013 03:20 PM, Biddiscombe, John A. wrote:<br>
</div>
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<div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Michael,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">I
had the same problem with a plugin of mine, so I added some
code to call mpi init in the client,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Have
a look at this patch. I can’t remember why I put in an
#ifdef win32 now, (maybe because I usually run the gui on
windows and the servers on the cray and probably it needed a
tweak on linux…)<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><a moz-do-not-send="true" href="https://github.com/biddisco/ParaView/commit/10e4affe2d7a4736d05d1d14cfaffc996c227649">https://github.com/biddisco/ParaView/commit/10e4affe2d7a4736d05d1d14cfaffc996c227649</a><o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">note
also I needed thread multiple, so you might be able to
simplify it slightly.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">This
patch might be obsolete, because I think I found a way of
doing it inside the plugin…[pause] … no in the plugin I swap
the global communicator from a dummycontroller to a true mpi
controller. Try this patch and if it doesn’t work I’ll point
you to my plugin tweaks.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">JB<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext" lang="EN-US">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext" lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:paraview-developers-bounces@paraview.org">paraview-developers-bounces@paraview.org</a>
[<a class="moz-txt-link-freetext" href="mailto:paraview-developers-bounces@paraview.org">mailto:paraview-developers-bounces@paraview.org</a>] <b>On
Behalf Of </b>burlen<br>
<b>Sent:</b> 01 June 2013 19:19<br>
<b>To:</b> Michael Schlottke<br>
<b>Cc:</b> ParaView Developers<br>
<b>Subject:</b> Re: [Paraview-developers] ParaView
plugins with MPI only on client<o:p></o:p></span></p>
</div>
</div><p class="MsoNormal"><o:p> </o:p></p>
<div><p class="MsoNormal">Hi Micheal,<br>
<br>
I think you better let ParaView start MPI. There is a method
that every reader should implement called CanReadFile. If
you're reader cannot run with out MPI then in CanReadFile
you should check if MPI is initialized and if not then you
should return false. Then ParaView will not attempt to use
your reader. This will avoid crashes when you are not
running in client server mode. Something like this...<br>
<br>
<tt><span style="font-size:10.0pt">276
//-----------------------------------------------------------------------------</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<tt>277 int vtkSQBOVReaderBase::CanReadFile(const char
*file)</tt><br>
<tt>278 {</tt><br>
<tt>279 #if defined SQTK_DEBUG</tt><br>
<tt>280 pCerr() <<
"=====vtkSQBOVReaderBase::CanReadFile" << endl;</tt><br>
<tt>281 pCerr() << "Check " << safeio(file)
<< "." << endl;</tt><br>
<tt>282 #endif</tt><br>
<tt>283</tt><br>
<tt>284 int status=0;</tt><br>
<tt>285</tt><br>
<tt>286 #ifdef SQTK_WITHOUT_MPI</tt><br>
<tt>287 (void)file;</tt><br>
<tt>288 #else</tt><br>
<tt>289 // first check that MPI is initialized. in
builtin mode MPI will</tt><br>
<tt>290 // never be initialized and this reader will be
unable to read files</tt><br>
<tt>291 // so we always return false in this case</tt><br>
<tt>292 int mpiOk=0;</tt><br>
<tt>293 MPI_Initialized(&mpiOk);</tt><br>
<tt>294 if (!mpiOk)</tt><br>
<tt>295 {</tt><br>
<tt>296 return 0;</tt><br>
<tt>297 }</tt><br>
<tt>298</tt><br>
<tt>299 // only rank 0 opens the file, this results in
metadata</tt><br>
<tt>300 // being parsed. If the parsing of md is
successful then</tt><br>
<tt>301 // the file is ours.</tt><br>
<tt>302
this->Reader->SetCommunicator(MPI_COMM_SELF);</tt><br>
<tt>303 status=this->Reader->Open(file);</tt><br>
<tt>304 this->Reader->Close();</tt><br>
<tt>305 #endif</tt><br>
<tt>306</tt><br>
<tt>307 return status;</tt><br>
<tt>308 }</tt></span><br>
<br>
Of course if ParaView is built without MPI then you should
always return false. An even better solution is to structure
your reader to work both with and without mpi. I know it's
doable if you're using unidata netcdf ver 4, not so sure
about pnetcdf...<br>
<br>
Burlen <br>
<br>
On 06/01/2013 08:15 AM, Michael Schlottke wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><p class="MsoNormal">Hi, <o:p></o:p></p>
<div><p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><p class="MsoNormal">for one of our own ParaView reader
plugins we rely on Parallel NetCDF (pnetcdf) to do read in
data in parallel, which in turn uses MPI to do the
parallel I/O. Principally our reading algorithm works with
any number of processes, including one.<o:p></o:p></p>
</div>
<div><p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><p class="MsoNormal">At the moment, we always have to start
a pvserver instance with MPI (i.e. mpiexec -n NN
pvserver), start a normal client, and connect to the
pvserver instance if we want to use the plugin - this also
works for NN=1. However, when I start the ParaView client,
the plugin crashes because MPI was not loaded/started.
Thus we always have to go through the extra steps of
starting a pvserver if we want to use the plugin.<o:p></o:p></p>
</div>
<div><p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><p class="MsoNormal">Thus my question is whether there is a
way to either start/load MPI manually from the plugin, or
if it is possible to configure the client to automatically
load and start the MPI library? Just enabling the
Multi-Core option in the ParaView settings does not seem
to do the trick.<o:p></o:p></p>
</div>
<div><p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div><p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><p class="MsoNormal">Michael<o:p></o:p></p>
</div><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<div>
<div>
<div>
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<div>
<div>
<div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">--<o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Michael
Schlottke<o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">SimLab
Highly Scalable Fluids &
Solids Engineering<o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Jülich
Aachen Research Alliance
(JARA-HPC)<o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">RWTH
Aachen University<o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Wüllnerstraße
5a<br>
52062 Aachen<br>
Germany<o:p></o:p></span></p>
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<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Phone:
+49 (241) 80 95188<o:p></o:p></span></p>
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+49 (241) 80 92257<o:p></o:p></span></p>
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<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Mail:
<a moz-do-not-send="true" href="mailto:m.schlottke@aia.rwth-aachen.de">m.schlottke@aia.rwth-aachen.de</a><o:p></o:p></span></p>
</div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Web: <a moz-do-not-send="true" href="http://www.jara.org/jara-hpc">http://www.jara.org/jara-hpc</a><o:p></o:p></span></p>
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