[mvapich-discuss] How to display all MPI traffic for a task?

[Hari Subramoni]

Dear Thiago,

Currently MVAPICH2 does not have such a feature. We will explore some
options to see if we can have a patch for this and get back to you.

Regards,
Hari.

On Fri, Sep 26, 2014 at 10:17 AM, Thiago Quirino - NOAA Federal <
thiago.quirino at noaa.gov> wrote:

> Hi, folks.
>
> I am working on a numerical weather prediction model that is built on MPI.
> There is a call to MPI_Iprobe in a subroutine that is looking for a message
> with a specific tag from a specific host (i.e. neither of "MPI_ANY_SOURCE"
> or "MPI_ANY_TAG" were used). MPI_Iprobe is returning "true" when in fact
> the querying host should not have received a message. Actually, the
> subsequent call to MPI_Recv fails because it expects a payload of 12 bytes
> (3 integers), but 20 bytes were received (i.e. "Message truncated" error).
>
> So I am trying to figure out where within the vast and complex code a
> potential message with the specific tag and from a specific host is being
> sent out, that is, a potential tag collision. I am wondering if there is a
> debug flag or runtime variable that can be set for MVAPICH2 that will show
> all MPI traffic for a task, for example, "Host 0 MPI_Send to Host 10 with
> tag 20673", or something like that so that I can locate the bug.
>
> Thank you abundantly for any tips that you may have.
>
> All the best,
> Thiago.
>
>
> ---------------------------------------------------
> Thiago Quirino, Ph.D.
> NOAA Hurricane Research Division
> Numerical Modeling Group
> 4301 Rickenbacker Cswy.
> Miami, FL 33149
> P: 305-361-4337
> C: 305-409-9587
> E: Thiago.Quirino at noaa.gov
> http://hwrf.aoml.noaa.gov
> "The contents of this message are mine personally and do not necessarily
> reflect any position of NOAA, its affiliates, or any branch of the federal
> and local government."
>
> _______________________________________________
> mvapich-discuss mailing list
> mvapich-discuss at cse.ohio-state.edu
> http://mailman.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.cse.ohio-state.edu/pipermail/mvapich-discuss/attachments/20140929/9670014a/attachment.html>