[mvapich-discuss] MPI_Send over 2 GB fails

[Vittorio]

Thanks, i feared that i had something misconfigured, but i couldn't figure
out what
luckily apart from this test i don't need to send such large quantities of
data

thanks again
Vittorio

On Sun, Feb 22, 2009 at 11:01 PM, Matthew Koop <koop at cse.ohio-state.edu>wrote:

> Vittorio,
>
> This is a known issue we have with MVAPICH2. Currently some of the
> internal data structures within the library are not large enough to handle
> over 2GB of data in a single send operation.
>
> We are planning on fixing this in a future release.
>
> Matt
>
> On Sun, 22 Feb 2009, Vittorio wrote:
>
> > hello!
> > i'm performing some performance test of mpvapich2 on infiniband:
> > the test is very simple sending fixed quantities of data from one node to
> > another.
> > from 1 kB to 2 GB there are no problems but as soon as i try to transfer
> 4GB
> > and above i get
> >
> > Fatal error in MPI_Send: Internal MPI error!, error stack:
> > MPI_Send(192): MPI_Send(buf=0x6020a0, count=536870912, MPI_UNSIGNED_LONG,
> > dest=1, tag=1, MPI_COMM_WORLD) failed
> > (unknown)(): Internal MPI error![cli_0]: aborting job:
> > Fatal error in MPI_Send: Internal MPI error!, error stack:
> > MPI_Send(192): MPI_Send(buf=0x6020a0, count=536870912, MPI_UNSIGNED_LONG,
> > dest=1, tag=1, MPI_COMM_WORLD) failed
> > (unknown)(): Internal MPI error!
> > rank 0 in job 11  randori_45329   caused collective abort of all ranks
> >   exit status of rank 0: return code 1
> >
> > the two machines are equal with a 64bit OS and equipped with 32 GB of
> ram.
> > i also tried the program on a single machine, but i receive the same
> error
> > just after the 2 GB transfer.
> >
> > i'm pretty sure MPI can send more than 4 GB of data so i just can't
> figure
> > out what the problem might be.
> > any help is really appreciated
> > thanks a lot
> > Vittorio
> >
>
>
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