[mpich-discuss] Cannot build mpich2-1.0.8p1 (nemesis) with PGI8.0-4 on Linux x86_64

[Rajeev Thakur]

Gus,
    ssm uses shared memory within a node and TCP across nodes. You can use
it with the PGI compilers until we get the Nemesis build to work with PGI
compilers.

Rajeev
 

> -----Original Message-----
> From: mpich-discuss-bounces at mcs.anl.gov 
> [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Gus Correa
> Sent: Wednesday, April 01, 2009 4:48 PM
> To: Mpich Discuss
> Subject: Re: [mpich-discuss] Cannot build mpich2-1.0.8p1 
> (nemesis) with PGI8.0-4 on Linux x86_64
> 
> Hi Rajeev, list
> 
> Rajeev Thakur wrote:
> >>> We have dual-socket quad-core Opteron processor nodes (8
> >> cores/node).
> >>> I am afraid ch3:sock may not be the best choice for this type of 
> >>> "fat" node, where shared memory shortcuts (memcpy ?) may 
> work better 
> >>> than sockets.
> > 
> > You could try the ch3:ssm channel then.
> > 
> > Rajeev
> 
> 
> Sure, and I did use ch3:ssm on a standalone multicore 
> workstation with good results.
> 
> However, for a Beowulf cluster, ch3:nemesis seems to promise 
> the best of all worlds: shared memory communication for 
> intranode, and a TCP/IP mechanism for internode.
> In addition, a number of codes we run here require more than
> 8 processes, and will use more than one node at a time, which 
> cannot be done with ch3:ssm.
> 
> It is also a matter of convenience, otherwise I would have to 
> keep MPICH2 builds for ch3:ssm, ch3:sock, and ch3:nemesis, 
> which combined with different compilers (Gnu, Intel, PGI, and 
> hybrid compiler mixes) would give me too large a number of 
> libraries to build and maintain.
> I would rather build MPICH2 with the most flexible 
> communication channel, which seems to be nemesis, right?
> 
> Also, I heard from the MPICH2 pros
> (i.e. a gentleman called Rajeev Thakur and his team) very 
> convincing arguments to use ch3:nemesis.
> And I believe them!  :)
> 
> Gus Correa
> ---------------------------------------------------------------------
> Gustavo Correa
> Lamont-Doherty Earth Observatory - Columbia University 
> Palisades, NY, 10964-8000 - USA
> ---------------------------------------------------------------------
>