[mpich-discuss] Internal memory allocation error?

[Rajeev Thakur]

Can you send us a code fragment that shows exactly what you are doing and
how many sends/recvs are being issued? You don't need to change sends to
isends, just the recvs.

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: Sunday, October 19, 2008 4:39 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: Re: [mpich-discuss] Internal memory allocation error?
> 
> Hello Rajeev and list-
> 
> Well, I've replaced MPI_Send with MPI_ISend and MPI_Recv with 
> MPI_Irecv, with the corresponding MPI_Wait calls as late as I 
> possibly can while doing the intermediate calculations, and I 
> still get the error.  The error even comes up when I use only 
> one slave process to do the calculations (in essence the 
> serial version of the algorithm).
> 
> Is there a limit on the tag value that accompanies the MPI_Send?
> 
> 
> 
> On Sat, Oct 18, 2008 at 3:39 PM, Rajeev Thakur 
> <thakur at mcs.anl.gov> wrote:
> > Yes, you do need MPI_Wait or MPI_Waitall but you can call 
> the Irecv as 
> > early as possible and delay the Wait until just before you 
> need the data.
> >
> > 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: Saturday, October 18, 2008 11:38 AM
> >> To: mpich-discuss at mcs.anl.gov
> >> Subject: Re: [mpich-discuss] Internal memory allocation error?
> >>
> >> 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
> >>
> >>
> >
> >
> 
> 
> 
> --
> Cheers,
> Brian
> brian.harker at gmail.com
> 
> 
> "In science, there is only physics; all the rest is stamp-collecting."
> 
> -Ernest Rutherford
> 
>