I have a small program in F77 that makes a SEGV crash with
a 130MB core file. It is true that the crash is much cleaner
in OpenMPI 1.2; nice improvement! The core file is 500 MB with
OpenMPI 1.1.
I am running on CentOS 4.4 with the latest patches.
mpif77 -g -o bug bug.f
mpirun -np 2 ./bug
I also have a bug.f90 (which I made first) and it crashes
too with the Intel ifort compiler 9.1.039.
--
Dr. Erik Deumens
Interim Director
Quantum Theory Project
New Physics Building 2334 deum...@qtp.ufl.edu
University of Florida http://www.qtp.ufl.edu/~deumens
Gainesville, Florida 32611-8435 (352)392-6980
program mainf
c mpif77 -g -o bug bug.f
c mpirun -np 2 ./bug
implicit none
include 'mpif.h'
character*80 inpfile
integer l
integer i
integer stat
integer cmdbuf(4)
integer lcmdbuf
integer ierr
integer ntasks
integer taskid
integer bufpos
integer cmd
integer ldata
character*(mpi_max_processor_name) hostnm
integer iuinp
integer iuout
integer lnam
real*8 bcaststart
iuinp = 5
iuout = 6
lcmdbuf = 16
i = 0
call mpi_init(ierr)
call mpi_comm_size (mpi_comm_world, ntasks, ierr)
call mpi_comm_rank (mpi_comm_world, taskid, ierr)
hostnm = ' '
call mpi_get_processor_name (hostnm, lnam, ierr)
write (iuout,*) 'task',taskid,'of',ntasks,'on ',hostnm(1:lnam)
if (taskid == 0) then
inpfile = ' '
do
write (iuout,*) 'Enter .inp filename:'
read (iuinp,*) inpfile
if (inpfile /= ' ') exit
end do
l = len_trim(inpfile)
write (iuout,*) 'task',taskid,inpfile(1:l)
bufpos = 0
cmd = 1099
ldata = 7
write (iuout,*) 'task',taskid,cmdbuf,bufpos
write (iuout,*) 'task',taskid,cmd,lcmdbuf
call mpi_pack (cmd, 1, MPI_INTEGER,
* cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
write (iuout,*) 'task',taskid,cmdbuf,bufpos
write (iuout,*) 'task',taskid,ldata,lcmdbuf
call mpi_pack (ldata, 1, MPI_INTEGER,
* cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
bcaststart = mpi_wtime()
write (iuout,*) 'task',taskid,cmdbuf,bufpos
write (iuout,*) 'task',taskid,bcaststart,lcmdbuf
call mpi_pack (bcaststart, 1, MPI_DOUBLE_PRECISION,
* cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
write (iuout,*) 'task',taskid,cmdbuf,bufpos
end if
call mpi_bcast (cmdbuf, lcmdbuf, MPI_PACKED,
* 0, MPI_COMM_WORLD, ierr)
call mpi_finalize(ierr)
stop
end program mainf
program mainf
! ifort -g -I /share/local/lib/ompi/include -o bug bug.f90
! -L /share/local/lib/ompi/lib -lmpi_f77 -lmpi
! mpirun -np 2 ./bug
implicit none
include 'mpif.h'
character(len=80) :: inpfile
character(len=1), dimension(80) :: cinpfile
integer :: l
integer :: i
integer :: stat
integer, dimension(4) :: cmdbuf
integer :: lcmdbuf
integer :: ierr
integer :: ntasks
integer :: taskid
integer :: bufpos
integer :: cmd
integer :: ldata
character(len=mpi_max_processor_name) :: hostnm
integer :: iuinp = 5
integer :: iuout = 6
integer :: lnam
real(8) :: bcaststart
lcmdbuf = 16
i = 0
call mpi_init(ierr)
call mpi_comm_size (mpi_comm_world, ntasks, ierr)
call mpi_comm_rank (mpi_comm_world, taskid, ierr)
hostnm = ' '
call mpi_get_processor_name (hostnm, lnam, ierr)
write (iuout,*) 'task',taskid,'of',ntasks,'on ',hostnm(1:lnam)
if (taskid == 0) then
inpfile = ' '
do
write (iuout,*) 'Enter .inp filename:'
read (iuinp,*) inpfile
if (inpfile /= ' ') exit
end do
l = len_trim(inpfile)
do i=1,l
cinpfile(i) = inpfile(i:i)
end do
cinpfile(l+1) = char(0)
write (iuout,*) 'task',taskid,inpfile(1:l)
bufpos = 0
cmd = 1099
ldata = 7
write (iuout,*) 'task',taskid,cmdbuf,bufpos
! The next two lines exhibit the bug
! Uncomment the first and the program works
! Uncomment the second and the program dies in mpi_pack
! and produces a 137 MB core file.
write (iuout,*) 'task',taskid,cmd,lcmdbuf
! write (iuout,*) 'task',taskid,cmd
call mpi_pack (cmd, 1, MPI_INTEGER, &
cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
write (iuout,*) 'task',taskid,cmdbuf,bufpos
write (iuout,*) 'task',taskid,ldata,lcmdbuf
call mpi_pack (ldata, 1, MPI_INTEGER, &
cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
bcaststart = mpi_wtime()
write (iuout,*) 'task',taskid,cmdbuf,bufpos
write (iuout,*) 'task',taskid,bcaststart,lcmdbuf
call mpi_pack (bcaststart, 1, MPI_DOUBLE_PRECISION, &
cmdbuf, lcmdbuf, bufpos, MPI_COMM_WORLD)
write (iuout,*) 'task',taskid,cmdbuf,bufpos
end if
call mpi_bcast (cmdbuf, lcmdbuf, MPI_PACKED, &
0, MPI_COMM_WORLD, ierr)
call mpi_finalize(ierr)
stop
end program mainf
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