[mpich-discuss] Weird thing -- MPICH2 on domain

[Qiguo Jing]

Scott,

With and without the wired connection, laptop has the same hostname, and 
desktop has the same hostname. But laptop and desktop have different 
hostnames.

I am using mpich2-1.2.1-win-ia32.msi on both machines. Laptop is win7 64, 
and desktop is win7 32.

Another issue is: When I use laptop from home, if I use 3 or less 
processors, for example "mpiexec -user 0 -np 3 test.exe", it works; 
however, if I use more than 3 processors, for example, "mpiexec -user 0 
-np 4 test.exe", it fails, and the more processors I specified, the 
earlier I can see it fails.

Best,



From:
"Atchley, Scott" <atchleyes at ornl.gov>
To:
"discuss at mpich.org" <discuss at mpich.org>, 
Date:
01/29/2013 11:41 AM
Subject:
Re: [mpich-discuss] Weird thing -- MPICH2 on domain
Sent by:
discuss-bounces at mpich.org



Is it a hostname issue?

What is the hostname on both machines with and without the wired 
connection?

What does hydra expect to use?

Scott

On Jan 29, 2013, at 11:24 AM, Jayesh Krishna <jayesh at mcs.anl.gov> wrote:

> Hi,
> Is there any communication (MPI) between the laptop and the desktop? 
MPICH2 currently does not support running MPI programs across 32-bit and 
64-bit machines.
> How are you running your program (The complete mpiexec command and the 
output. Please copy-paste it from the command window)?
> 
> Regards,
> Jayesh 
> 
> ----- Original Message -----
> From: "Qiguo Jing" <QJing at TrinityConsultants.com>
> To: mpich-discuss at mcs.anl.gov
> Sent: Friday, January 25, 2013 5:16:58 PM
> Subject: [mpich-discuss] Weird thing -- MPICH2 on domain
> 
> 
> All, 
> 
> I have been encountering a weird thing, which draw me crazy. I hope 
someone here can help me. 
> 
> I have two computers, a laptop (Windows 7 64 bit) and a desktop (Window 
7 32 bit). Both are in company domain, and I use the some information to 
login. So the MPICH2 registration information are the same for both 
computers. I developed a parallel FORTRAN program using my laptop. 
> 
> 1. If I connect the internet cable on laptop. --> Program works. Results 
are good. 
> 2. If I disconnect the internet cable on laptop. --> Program fails, 
saying Program Exception - access violation 
> 3. If I connect the internet cable on Desktop. --> Program runs and 
finishes, but the results are wrong. Slave processors and master processor 
do not communicate, so that results on slave processor can not be passed 
to main processor. 
> 4. If I disconnect the internet cable on Desktop. -> Program works. 
Results are good. 
> 
> 
> Can someone help? 
> 
> 
> Thanks. 
> 
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