[mpich-discuss] FW: Issue running more than one job using MPICH2

[Rajeev Thakur]

Volker,
       You could create a single ring across all machines once, and then use
the machinefile to control job placement. You can use the "-1" option to
mpiexec if you don't want the first process to run locally.

Rajeev 

> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov 
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Rajeev Thakur
> Sent: Monday, August 18, 2008 11:14 AM
> To: mpich-discuss at mcs.anl.gov
> Cc: vasc at gmx.net
> Subject: [mpich-discuss] FW: Issue running more than one job 
> using MPICH2
> 
> -----Original Message-----
> Date: Mon, 18 Aug 2008 10:13:24 +0200
> From: "Volker Amedick" <vasc at gmx.net>
> Message-ID: <20080818081324.232070 at gmx.net>
> MIME-Version: 1.0
> Subject: Issue running more than one job using MPICH2
> To: mpich-discuss at mcs.anl.gov
> 
> Hi,
> 
> I am new to MPICH and run into an issue when launching more 
> than one program
> in an MPICH2 environment. Here is what I did: 
> o I start a ring of mpds using 'mpdboot -f fileWithHosts -n # 
> -r rsh'. 
> o Then I launch the program using 'mpiexec -machinefile 
> fileWithMachines -n
> # prog.x'
> This works perfect.
> o When I now start another ring of mpds to launch a 2nd 
> instance of prog.x,
> the mpds of the 1st ring disappear causing the 1st job to stop.
> 
> So, the question I have is how can I run 2 instances of 
> prog.x at the same
> time? 
> The cenario in more detail: I am sitting at host A and want 
> to launch prog.x
> the 1st instance on hosts B and C, the 2nd instance on D and 
> E. Currently I
> start a 1st ring of mpds on host A,B,C, then a 2nd on A,D,E 
> (I encountered
> that the local host A always need to be part of the ring). 
> 
> Any help is appreciated. Thanks in advance,
> Volker
> 
> MPICH2 version 1.0.6 (installed Jan. 08)
> OS: RedHat Enterprise WS4 U6 (same on all machines)
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