[mpich-discuss] Internal memory allocation error?

[Brian Harker]

Thanks Rajeev...since MPI_Irecv is nonblocking, should I pair it up
with an MPI_Wait to make sure I'm not trying to access a buffer that
hasn't been written to yet?

On Sat, Oct 18, 2008 at 9:38 AM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> This can happen if the sender does too many sends and the receiver doesn't
> post receives fast enough. Try using MPI_Irecv and posting enough of them to
> match the incoming sends.
>
> Rajeev
>
>> -----Original Message-----
>> From: owner-mpich-discuss at mcs.anl.gov
>> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Brian Harker
>> Sent: Friday, October 17, 2008 4:19 PM
>> To: mpich-discuss at mcs.anl.gov
>> Subject: [mpich-discuss] Internal memory allocation error?
>>
>> Hello list-
>>
>> I have a fortran 90 program that loops over pixels in an
>> image in parallel.  There are 211K total pixels in the
>> field-of-view, and the code always crashes around the 160K^th
>> pixel, give or take a hundred or so, with the following message:
>>
>> Fatal error in MPI_Recv: Other MPI error, error stack:
>> MPI_Recv(186).............................:
>> MPI_Recv(buf=0x82210d0, count=2, MPI_INTEGER, src=0,
>> tag=MPI_ANY_TAG, MPI_COMM_WORLD,
>> status=0x82210e0) failed
>> MPIDI_CH3i_Progress_wait(214).............: an error occurred
>> while handling an event returned by MPIDU_Sock_Wait()
>> MPIDI_CH3I_Progress_handle_sock_event(436):
>> MPIDI_EagerContigIsend(567)...............: failure occurred
>> while allocating memory for a request object[cli_2]: aborting job:
>>
>> Now, I have no dynamically allocatable variables in the code,
>> so the error means there is not enough memory in the buffer
>> for all the communication at this step?  I have increased
>> MP_BUFFER_MEM from the default 64M to 128M with no change in
>> the error.  Is it possible that I'm just trying to do too
>> much at once with my dual-core processor?  I wouldn't think
>> so, I'm only running the code with 6 processes...and I don't
>> believe this is a data problem.
>>
>> Any ideas would be appreciated, and I can post any other
>> information anyone wants.  Thanks!
>>
>>
>>
>> --
>> Cheers,
>> Brian
>> brian.harker at gmail.com
>>
>>
>> "In science, there is only physics; all the rest is stamp-collecting."
>>
>> -Ernest Rutherford
>>
>>
>
>



-- 
Cheers,
Brian
brian.harker at gmail.com


"In science, there is only physics; all the rest is stamp-collecting."

-Ernest Rutherford