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

Tue Jan 29 16:42:00 CST 2013

Jayesh,

I tried the latest windows version 1.4.1p1 of MPICH2. The same error. 

Thinking that I may need to modify my codes. It seems that using one 
processor to create a file then reading the file through all processors 
will generate such kind of errors. 

Thanks. 

From:
Jayesh Krishna <jayesh at mcs.anl.gov>
To:
discuss at mpich.org, 
Cc:
QJing at TrinityConsultants.com
Date:
01/29/2013 01:53 PM
Subject:
Re: [mpich-discuss] Weird thing -- MPICH2 on domain

Hi,
 Can you try out the latest Windows version, 1.4.1p1, of MPICH2 (
http://www.mpich.org/downloads/)?
 I don't remember when we changed the default channel on Windows from sock 
to nemesis. This could be the issue in your case. Please try the latest 
version available and let us know the results.

Regards,
Jayesh

----- Original Message -----
From: "Qiguo Jing" <QJing at TrinityConsultants.com>
Cc: discuss at mpich.org, discuss-bounces at mpich.org
Sent: Tuesday, January 29, 2013 12:44:55 PM
Subject: Re: [mpich-discuss] Weird thing -- MPICH2 on domain

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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