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Subject: Re: [OMPI users] Sending relatively large messages with high frequency
From: Amr Hassan (amr.abdelaziz_at_[hidden])
Date: 2010-02-25 18:35:47


Hi All,

Thanks a lot for your support. It was a big help. I found a race condition
in my code and now the problem is solved.

Regards,
Amr

On Fri, Feb 26, 2010 at 7:45 AM, Prentice Bisbal <prentice_at_[hidden]> wrote:

> Amr Hassan wrote:
> > Thanks alot for your reply,
> >
> > I'm using blocking Send and Receive. All the clients are sending data
> > and the server is receive the messages from the clients with
> > MPI_ANY_SOURCE as the sender. Do you think there is a race condition
> > near this pattern?
> >
> > I searched a lot and used totalview but I couldn't detect such case. I
> > really appreciate if you send me a link or give an example of a possible
> > race condition in that scenario .
> >
> > Also, when I partition the message into smaller parts (send in sequence
> > - all the other clients wait until the send finish) it works fine. is
> > that exclude the race condition?
> >
>
> It sounds like, when sending the large messages, you are putting more
> data into a buffer than it can hold. When you break the messages up into
> smaller sizes, you're not overflowing the buffer.
>
> Are you using MPI_Pack, by any chance?
>
> --
> Prentice Bisbal
> Linux Software Support Specialist/System Administrator
> School of Natural Sciences
> Institute for Advanced Study
> Princeton, NJ
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