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Subject: Re: [OMPI users] users Digest, Vol 1658, Issue 2
From: ananda.mudar_at_[hidden]
Date: 2010-08-13 10:12:17


Josh

I am having problems compiling the sources from the latest trunk. It
complains of libgomp.spec missing even though that file exists on my
system. I will see if I have to change any other environment variables
to have a successful compilation. I will keep you posted.

BTW, were you successful in reproducing the problem on a system with
OpenMPI 1.4.2?

Thanks
Ananda
-----Original Message-----
Date: Thu, 12 Aug 2010 09:12:26 -0400
From: Joshua Hursey <jjhursey_at_[hidden]>
Subject: Re: [OMPI users] Checkpointing mpi4py program
To: Open MPI Users <users_at_[hidden]>
Message-ID: <1F1445AB-9208-4EF0-AF25-5926BD53C7E1_at_[hidden]>
Content-Type: text/plain; charset=us-ascii

Can you try this with the current trunk (r23587 or later)?

I just added a number of new features and bug fixes, and I would be
interested to see if it fixes the problem. In particular I suspect that
this might be related to the Init/Finalize bounding of the checkpoint
region.

-- Josh

On Aug 10, 2010, at 2:18 PM, <ananda.mudar_at_[hidden]>
<ananda.mudar_at_[hidden]> wrote:

> Josh
>
> Please find attached is the python program that reproduces the hang
that
> I described. Initial part of this file describes the prerequisite
> modules and the steps to reproduce the problem. Please let me know if
> you have any questions in reproducing the hang.
>
> Please note that, if I add the following lines at the end of the
program
> (in case sleep_time is True), the problem disappears ie; program
resumes
> successfully after successful completion of checkpoint.
> # Add following lines at the end for sleep_time is True
> else:
> time.sleep(0.1)
> # End of added lines
>
>
> Thanks a lot for your time in looking into this issue.
>
> Regards
> Ananda
>
> Ananda B Mudar, PMP
> Senior Technical Architect
> Wipro Technologies
> Ph: 972 765 8093
> ananda.mudar_at_[hidden]
>
>
> -----Original Message-----
> Date: Mon, 9 Aug 2010 16:37:58 -0400
> From: Joshua Hursey <jjhursey_at_[hidden]>
> Subject: Re: [OMPI users] Checkpointing mpi4py program
> To: Open MPI Users <users_at_[hidden]>
> Message-ID: <270BD450-743A-4662-9568-1FEDFCC6F9C6_at_[hidden]>
> Content-Type: text/plain; charset=windows-1252
>
> I have not tried to checkpoint an mpi4py application, so I cannot say
> for sure if it works or not. You might be hitting something with the
> Python runtime interacting in an odd way with either Open MPI or BLCR.
>
> Can you attach a debugger and get a backtrace on a stuck checkpoint?
> That might show us where things are held up.
>
> -- Josh
>
>
> On Aug 9, 2010, at 4:04 PM, <ananda.mudar_at_[hidden]>
> <ananda.mudar_at_[hidden]> wrote:
>
>> Hi
>>
>> I have integrated mpi4py with openmpi 1.4.2 that was built with BLCR
> 0.8.2. When I run ompi-checkpoint on the program written using mpi4py,
I
> see that program doesn?t resume sometimes after successful checkpoint
> creation. This doesn?t occur always meaning the program resumes after
> successful checkpoint creation most of the time and completes
> successfully. Has anyone tested the checkpoint/restart functionality
> with mpi4py programs? Are there any best practices that I should keep
in
> mind while checkpointing mpi4py programs?
>>
>> Thanks for your time
>> - Ananda
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