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Subject: Re: [OMPI users] Open MPI data transfer error
From: David Zhang (solarbikedz_at_[hidden])
Date: 2010-11-05 14:20:57


As Prentice said, we can't help you without seeing your code. openMPI has
stood many trials from many programmers, with many bugs ironed out. So
typically it is unlikely openMPI is the source of your error. Without
seeing your code the only logical conclusion is that something is wrong with
your programming.

On Fri, Nov 5, 2010 at 10:52 AM, Prentice Bisbal <prentice_at_[hidden]> wrote:

> We can't help you with your coding problem without seeing your code.
>
>
> Jack Bryan wrote:
> > Thanks,
> > I have used "cout" in c++ to print the values of data.
> >
> > The sender sends correct data to correct receiver.
> >
> > But, receiver gets wrong data from correct sender.
> >
> > why ?
> >
> > thanks
> >
> > Nov. 5 2010
> >
> >> Date: Fri, 5 Nov 2010 08:54:22 -0400
> >> From: prentice_at_[hidden]
> >> To: users_at_[hidden]
> >> Subject: Re: [OMPI users] Open MPI data transfer error
> >>
> >> Jack Bryan wrote:
> >> >
> >> > Hi,
> >> >
> >> > In my Open MPI program, one master sends data to 3 workers.
> >> >
> >> > Two workers can receive their data.
> >> >
> >> > But, the third worker can not get their data.
> >> >
> >> > Before sending data, the master sends a head information to each
> worker
> >> > receiver
> >> > so that each worker knows what the following data package is. (such as
> >> > length, package tag).
> >> >
> >> > The third worker can get its head information message from master but
> >> > cannot get its correct
> >> > data package.
> >> >
> >> > It got the data that should be received by first worker, which get its
> >> > correct data.
> >> >
> >>
> >>
> >> Jack,
> >>
> >> Providing the relevant sections of code here would be very helpful.
> >>
> >> <inside joke>
> >> I would tell you to add some printf statements to your code to see what
> >> data is stored in your variables on the master before it sends them to
> >> each node, but Jeff Squyres and I agreed to disagree in a civil manner
> >> on that debugging technique earlier this week, and I'd hate to re-open
> >> those old wounds by suggesting that technique here. ;)
> >> </inside joke>
> >>
> >> --
> >> Prentice
> _______________________________________________
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>

-- 
David Zhang
University of California, San Diego