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Subject: Re: [OMPI users] MPI_Send over 2 GB
From: Justin (luitjens_at_[hidden])
Date: 2009-02-18 19:20:33


My guess would be that your count argument is overflowing. Is the count
a signed 32 bit integer? If so it will overflow around 2GB. Try
outputting the size that you are sending and see if you get large
negative number.

Justin

Vittorio wrote:
> Hi! I'm doing a test to measure the transfer rates and latency of ompi
> over infiniband
>
> starting from 1 kB everything was doing fine until i wanted to
> transfer 2 GB and i received this error
>
> [tatami:02271] *** An error occurred in MPI_Recv
> [tatami:02271] *** on communicator MPI_COMM_WORLD
> [tatami:02271] *** MPI_ERR_COUNT: invalid count argument
> [tatami:02271] *** MPI_ERRORS_ARE_FATAL (goodbye)
> [randori:12166] *** An error occurred in MPI_Send
> [randori:12166] *** on communicator MPI_COMM_WORLD
> [randori:12166] *** MPI_ERR_COUNT: invalid count argument
> [randori:12166] *** MPI_ERRORS_ARE_FATAL (goodbye)
>
>
> this error appears if i run the program either on the same node or both
> is 2 GB the intrinsic limit of MPI_Send/MPI_Recv?
>
> thanks a lot
> Vittorio
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