[mpich-discuss] Problem sometimes when running on winxp on >=2 processes and MPE_IBCAST
Anthony Chan
chan at mcs.anl.gov
Wed May 7 11:13:00 CDT 2008
May not be related to the error that you saw. You shouldn't call
MPI_Barrier and MPI_Bcast with a do loop over processes.
A.Chan
----- "Ben Tay" <zonexo at gmail.com> wrote:
> Hi Rajeev,
>
> I've attached the code. Thank you very much.
>
> Regards.
>
> Rajeev Thakur wrote:
> > Can you send us the code?
> >
> > MPE_IBCAST is not a part of the MPI standard. There is no equivalent
> for it
> > in MPICH2. You could spawn a thread that calls MPI_Bcast though
> (after
> > following all the caveats of MPI and threads as defined in the
> standard).
> >
> > Rajeev
> >
> >
> >> -----Original Message-----
> >> From: owner-mpich-discuss at mcs.anl.gov
> >> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Ben Tay
> >> Sent: Wednesday, May 07, 2008 10:25 AM
> >> To: mpich-discuss at mcs.anl.gov
> >> Subject: [mpich-discuss] Problem sometimes when running on
> >> winxp on >=2 processes and MPE_IBCAST
> >>
> >> Hi,
> >>
> >> I tried to run a mpi code which is copied from an example by
> >> the RS 6000 book. It is supposed to broadcast and synchronize
> >> all values. When I ran it on my school's linux servers, there
> >> is no problem. However, if I run it on my own winxp, on >=2
> >> processes, sometimes it work, other times I get the error:
> >>
> >> [01:3216].....ERROR:result command received but the wait_list
> >> is empty.
> >> [01:3216]...ERROR:unable to handle the command: "cmd=result
> >> src=1 dest=1
> >> tag=7 c
> >> md_tag=3 cmd_orig=dbget ctx_key=1 value="port=1518
> >> description=gotchama-16e5ed i
> >> fname=192.168.1.105 " result=DBS_SUCCESS "
> >> [01:3216].ERROR:error closing the unknown context socket:
> >> generic socket failure , error stack:
> >> MPIDU_Sock_wait(2603): The I/O operation has been aborted
> >> because of either a th read exit or an application request.
> >> (errno 995) [01:3216]..ERROR:sock_op_close returned while
> >> unknown context is in
> >> state: SMPD_
> >> IDLE
> >>
> >> Or
> >>
> >> [01:3308].....ERROR:result command received but the wait_list
> >> is empty.
> >> [01:3308]...ERROR:unable to handle the command: "cmd=result
> >> src=1 dest=1
> >> tag=15
> >> cmd_tag=5 cmd_orig=barrier ctx_key=0 result=DBS_SUCCESS "
> >> [01:3308]..ERROR:sock_op_close returned while unknown context is
> in
> >> state: SMPD_
> >> IDLE
> >>
> >> There is no problem if I run on 1 process. If it's >=4, then
> >> the error happens all the time. Moreover, it's a rather
> >> simple code and so there shouldn't be anything wrong with it.
> >> Why is this so?
> >>
> >> Btw, the RS 6000 book also mention a routine called
> >> MPE_IBCAST, which is a non-blocking version of MPI_BCAST. Is
> >> there a similar routine in MPICH2?
> >>
> >> Thank you very much
> >>
> >> Regards.
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
>
>
> program mpi_test2
>
> ! test to show updating for i,j double loop (partial continuous data)
> for specific req data only
>
> ! ie update u(2:6,2:6) values instead of all u values, also for struct
> data
>
> ! FVM use
>
> implicit none
>
> include "mpif.h"
>
> integer, parameter :: size_x=8,size_y=8
>
> integer :: i,j,k,ierr,rank,nprocs,u(size_x,size_y)
>
> integer :: jsta,jend,jsta2,jend1,inext,iprev,isend1,irecv1,isend2
>
> integer :: irecv2,is,ie,js,je
>
> integer, allocatable :: jjsta(:), jjlen(:),jjreq(:),u_tmp(:,:)
>
> INTEGER istatus(MPI_STATUS_SIZE)
>
>
>
> call MPI_Init(ierr)
>
> call MPI_Comm_rank(MPI_COMM_WORLD,rank,ierr)
>
> call MPI_Comm_size(MPI_COMM_WORLD,nprocs,ierr)
>
> allocate (jjsta(0:nprocs-1),jjlen(0:nprocs-1),jjreq(0:nprocs-1))
>
> is=3; ie=6; js=3; je=6
>
> allocate (u_tmp(is:ie,js:je))
>
>
>
> do k = 0, nprocs - 1
>
> call para_range(js,je, nprocs, k, jsta, jend)
>
> jjsta(k) = jsta
>
> jjlen(k) = (ie-is+1) * (jend - jsta + 1)
>
> end do
>
> call para_range(js, je, nprocs, rank , jsta, jend)
>
> do j=jsta,jend
>
> do i=is,ie
>
> u(i,j)=(j-1)*size_x+i
>
>
>
> end do
>
> end do
>
> do j=jsta,jend
>
> do i=is,ie
>
> u_tmp(i,j)=u(i,j)
>
>
>
> end do
>
> end do
>
> do k=0,nprocs-1
>
> call MPI_Barrier(MPI_COMM_WORLD,ierr)
>
> if (k==rank) then
>
> print *, rank
>
> write (*,'(8i5)') u
>
>
>
> end if
>
> end do
>
> do k = 0, nprocs - 1
>
>
>
> call MPI_BCAST(u_tmp(is,jjsta(k)), jjlen(k), MPI_Integer,k,
> MPI_COMM_WORLD, ierr)
>
> end do
>
>
>
>
> deallocate (jjsta, jjlen, jjreq)
>
> u(is:ie,js:je)=u_tmp(is:ie,js:je)
>
>
>
> do k=0,nprocs-1
>
> call MPI_Barrier(MPI_COMM_WORLD,ierr)
>
> if (k==rank) then
>
> print *, rank
>
> write (*,'(8i5)') u
>
>
>
> end if
>
> end do
>
>
>
>
> call MPI_Finalize(ierr)
>
> contains
>
> subroutine para_range(n1, n2, nprocs, irank, ista, iend)
> ! block distribution
>
> integer n1 !The lowest value of the iteration variable (IN)
>
> integer n2 !The highest value of the iteration variable (IN)
>
> integer nprocs !The number of processes (IN)
>
> integer irank !The rank for which you want to know the range of
> iterations(IN)
>
> integer ista !The lowest value of the iteration variable that process
> irank executes (OUT)
>
> integer iend !The highest value of the iteration variable that process
> irank executes (OUT)
>
> integer iwork1,iwork2
>
> iwork1 = (n2 - n1 + 1) / nprocs
>
> iwork2 = mod(n2 - n1 + 1, nprocs)
>
> ista = irank * iwork1 + n1 + min(irank, iwork2)
>
> iend = ista + iwork1 - 1
>
> if (iwork2 > irank) iend = iend + 1
>
> end subroutine para_range
>
> end program mpi_test2
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