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<title>Re: [mpi-21] Ballot 4 - MPI_THREAD_FUNNELED - was Re: Attending,
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<p class=MsoNormal><font size=2 color=blue face=Verdana><span style='font-size:
10.0pt;font-family:Verdana;color:blue'>Because that’s how it’s
always been. We’re not adding a restriction with the change, merely clarifying
the existing restriction.<o:p></o:p></span></font></p>
<div>
<p style='margin-bottom:12.0pt'><font size=2 color=blue face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:blue'>-- Jim<br>
<br>
James Cownie <james.h.cownie@intel.com><br>
SSG/DPD/PAT<br>
Tel: +44 117 9071438</span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mpi-21-bounces@cs.uiuc.edu [mailto:mpi-21-bounces@cs.uiuc.edu] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Richard Graham<br>
<b><span style='font-weight:bold'>Sent:</span></b> 31 January 2008 15:51<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Mailing
list for discussion of MPI 2.1</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mpi-21] Ballot 4 -
MPI_THREAD_FUNNELED - was Re: Attending, topics, etc</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=1 face=Verdana><span
style='font-size:9.0pt;font-family:Verdana'>Why restrict this to a standard
specified thread (main thread), why not word it<br>
as a singe thread, and let the app decide what thread this is, based on
what<br>
ever criteria it wants to use to select this thread ?<br>
<br>
Rich<br>
<br>
<br>
On 1/31/08 10:27 AM, "Richard Treumann" <treumann@us.ibm.com>
wrote:</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=1 face=Verdana><span
style='font-size:9.0pt;font-family:Verdana'>How about::<br>
</span></font><font size=1 face="Courier New"><span style='font-size:7.5pt;
font-family:"Courier New"'>MPI_THREAD_FUNNELED The process may be
multi-threaded, but</span></font><font size=1 face=Verdana><span
style='font-size:9.0pt;font-family:Verdana'> the application<br>
must insure that only the main thread makes MPI calls.<br>
<br>
<br>
Dick Treumann - MPI Team/TCEM
<br>
IBM Systems & Technology Group<br>
<st1:address w:st="on"><st1:Street w:st="on">Dept</st1:Street> 0lva</st1:address>
/ MS P963 -- <st1:Street w:st="on"><st1:address w:st="on">2455 South Road</st1:address></st1:Street>
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w:st="on">NY</st1:State> <st1:PostalCode w:st="on">12601</st1:PostalCode></st1:place><br>
Tele (845) 433-7846 Fax (845)
433-8363<br>
<br>
<br>
</span></font><font size=1 face="Courier New"><span style='font-size:7.5pt;
font-family:"Courier New"'>mpi-21-bounces@cs.uiuc.edu wrote on 01/31/2008
09:44:08 AM:<br>
<br>
> A simpler change which would seem to achieve the desired clarification<br>
> would be :- <br>
> <br>
> MPI_THREAD_FUNNELED The process may be multi-threaded,
but only the<br>
> main
<br>
> thread is allowed to make MPI calls.<br>
> <br>
> (and you could add <br>
> If other threads make MPI calls the behavior is
undefined.<br>
> if you want to be verbose about it).<br>
> <br>
> -- Jim<br>
> <br>
> James Cownie <james.h.cownie@intel.com><br>
> SSG/DPD/PAT<br>
> Tel: +44 117 9071438<br>
> <br>
> <br>
> <br>
> <br>
> > -----Original Message-----<br>
> > From: mpi-21-bounces@cs.uiuc.edu [<a
href="mailto:mpi-21-bounces@cs.uiuc.edu%5d">mailto:mpi-21-bounces@cs.uiuc.edu]</a><br>
> On<br>
> > Behalf Of Rolf Rabenseifner<br>
> > Sent: 31 January 2008 14:31<br>
> > To: mpi-21@cs.uiuc.edu<br>
> > Subject: [mpi-21] Ballot 4 - MPI_THREAD_FUNNELED - was Re: Attending,<br>
> > topics, etc<br>
> > <br>
> > This is a proposal for MPI 2.1, Ballot 4.<br>
> > <br>
> > I'm asking especially<br>
> > Greg Lindahl,<br>
> > the participants of the email-discussion in 2007, to review this<br>
> proposal.<br>
> > <br>
> > This is a follow up to:<br>
> > Which thread is the funneled thread?<br>
> > in <a
href="http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-">http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-</a><br>
> > errata/index.html<br>
> > with mail discussion in<br>
> > <a
href="http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-">http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-</a><br>
> > errata/discuss/funneled/<br>
> > ___________________________________<br>
> > <br>
> > Proposal:<br>
> > MPI-2.0 Sect. 8.7.3, MPI_Init_thread, page 196, lines 25-26 read:<br>
> > <br>
> > MPI_THREAD_FUNNELED The process may be multi-threaded,
but only<br>
> > the main thread will make MPI calls (all MPI calls are
"funneled"<br>
> > to the main thread).<br>
> > <br>
> > but should read:<br>
> > <br>
> > MPI_THREAD_FUNNELED The process may be multi-threaded,
but only<br>
> > the main thread will make MPI calls (all MPI calls are
"funneled"<br>
> > to the main thread, e.g., by using the OpenMP directive
"master"<br>
> > in the application program).<br>
> > ___________________________________<br>
> > Rationale for this clarification from the email from Greg Lindahl:<br>
> > The existing document doesn't make it clear that<br>
> > the MPI user has to funnel the calls to the main thread;<br>
> > it's not the job of the MPI library. I have seen multiple<br>
> > MPI users confused by this issue, and when I first read<br>
> > this section, I was confused by it, too.<br>
> > ___________________________________<br>
> > <br>
> > <br>
> > Best regards<br>
> > Rolf<br>
> > <br>
> > <br>
> > <br>
> > <br>
> > Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner@hlrs.de<br>
> > High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530<br>
> > <st1:place w:st="on"><st1:PlaceType w:st="on">University</st1:PlaceType>
of <st1:PlaceName w:st="on">Stuttgart</st1:PlaceName></st1:place> . . . . . .
. . .. fax ++49(0)711 / 685-65832<br>
> > Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner<br>
> > Nobelstr. 19, D-70550 <st1:place w:st="on"><st1:City w:st="on">Stuttgart</st1:City>,
<st1:country-region w:st="on">Germany</st1:country-region></st1:place> .
(Office: Allmandring 30)<br>
> > _______________________________________________<br>
> > mpi-21 mailing list<br>
> > mpi-21@cs.uiuc.edu<br>
> > <a href="http://lists.cs.uiuc.edu/mailman/listinfo/mpi-21">http://lists.cs.uiuc.edu/mailman/listinfo/mpi-21</a><br>
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