[mvapich-discuss] MV2_USE_BLOCKING option trouble on MVAPICH2 all version

[Yutaka Kubota]

Hi Sreeram,

 

We could do and resolve this issue using "MV2_ON_DEMAND_THRESHOLD=128"
option.

Thank you very much, please close this question.

 

Best regards

 

Yutaka Kubota

 

From: sreeram potluri [mailto:sreeram.chowdary at gmail.com] 
Sent: Tuesday, September 01, 2009 3:17 AM
To: Yutaka Kubota
Cc: mvapich-discuss at cse.ohio-state.edu
Subject: Re: [mvapich-discuss] MV2_USE_BLOCKING option trouble on
MVAPICH2 all version

 

Hi Yutaka,

Regarding the issue you are seeing with BLOCKING mode:  Beyond 64
processes mvapich2 uses on-demand mode of connection setup and the
combination of on-demand + blocking is not supported yet. We plan to add
this into our next release. 

As a work around, you can set MV2_ON_DEMAND_THRESHOLD=128 during
runtime.  This will turn off on-demand connection management upto 128
processes and blocking mode should work fine. To run with larger number
of processes, you can set the MV2_ON_DEMAND_THRESHOLD accordingly.

We are still looking into the compile-time issue you are seeing. It
would be helpful if you can forward us the source code.

Please let us know if you face any other issues.

Thanks
Sreeram Potluri

On Mon, Aug 31, 2009 at 12:59 AM, Yutaka Kubota <kubota at cray.com> wrote:

Dear MVAPICH2 Members,

How do you do. This is Yutaka Kubota from Cray Japan.
I try to submit MVAPICH2 issue first time that we found.

We found blocking mode trouble using cpi.c program that is MVAPIC2
sample program. This problem was appeared using "MV2_USE_BLOCKING=1"
option and appoint over 65 cores. If this program execute with option on
the environment. The message appeared " Created comp channel 0x1ff6ce10"
and stop on the way. We think it is issue of MVAPICH2. Because this
problem was not appeared with "VIADEV_USE_BLOCKING=1" option and appoint
over 65 cores on MVAPICH.

$ mpirun_rsh -np 65 -hostfile hostfile.txt MV2_USE_BLOCKING=0  ./a.out
Created comp channel 0x1ff6ce10
* In the case of "-np 64" is not appeared this message

I also found compile issue of MVAPICH2 latest version.
I guessed to suspect this issue for version 1.2-10-01. However we tried
to execute compile latest version. There are appeared follows message
during compiling.

-1.2p1 and 1.4rc1
/opt/intel/cce/10.1.015/lib/libimf.so: warning: warning: feupdateenv is
not implemented and will always fail
*But out putted a.out

If you need this source code. I will send you. The user had consented
that we send user program to developer team.

Best regards

Yutaka Kubota, Cray Japan Inc


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