我看到有人用MPI_Brier使用C(Segmentation fault while using MPI_Barrier in `libpmpi.12.dylib`)和C++(Why does MPI_Barrier cause a segmentation fault in C++)產生段錯誤。但是,我不會重現他們得到的錯誤。Fortran的段錯誤MPI_Barrier
但是,現在我得到了同樣的錯誤fortran MPI_Barrier。我的代碼很簡單:
program main
implicit none
include 'mpif.h'
! local variables
!
character(len=80) :: filename, input
character(len=4) :: command
integer :: ierror, i, l, cmdunit
logical :: terminate
integer :: num_procs, my_id, impi_error
real :: program_start, program_end
call MPI_INIT(impi_error)
call MPI_COMM_RANK(MPI_COMM_WORLD,my_id,impi_error)
call MPI_COMM_SIZE(MPI_COMM_WORLD,num_procs,impi_error)
call MPI_Barrier(MPI_COMM_WORLD)
program_start = MPI_Wtime()
filename='sc.cmd'
cmdunit=8
print *, my_id, cmdunit
call MPI_Barrier(MPI_COMM_WORLD)
call MPI_Barrier(MPI_COMM_WORLD)
call MPI_Barrier(MPI_COMM_WORLD)
call MPI_Barrier(MPI_COMM_WORLD)
call MPI_Barrier(MPI_COMM_WORLD)
program_end = MPI_Wtime()
if (my_id == 0) then
write(*,'(a,F25.16,a)') "MDStressLab runs in ", program_end - program_start, " s."
endif
call MPI_FINALIZE(impi_error)
end program
沒有什麼特別的代碼。但是,當我使用命令mpif90 tmp.f90編譯代碼,然後使用命令mpirun -n 2 ./a.out運行時。它給我:
0 8
1 8
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
Backtrace for this error:
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
Backtrace for this error:
#0 0x7FBF2C700E08
#1 0x7FBF2C6FFF90
#0 0x7F2EDF972E08
#2 0x7FBF2C3514AF
#1 0x7F2EDF971F90
#2 0x7F2EDF5C34AF
#3 0x7FBF2CA4F808
#4 0x400EB4 in MAIN__ at tmp.f90:?
#3 0x7F2EDFCC1808
#4 0x400EB4 in MAIN__ at tmp.f90:?
--------------------------------------------------------------------------
mpirun noticed that process rank 1 with PID 35660 on node min-virtual-machine exited on signal 11 (Segmentation fault).
--------------------------------------------------------------------------
有趣的是,它只與2個節點崩潰。它會運行正常,1到10個節點除外2.因爲這也發生在C和C++中隨機發生,所以我認爲MPI庫中某處可能存在一些隱藏的錯誤。這只是我的猜測。任何人都可以幫忙嗎?
不要使用'include'mpif.h''。使用'使用mpi'和編譯器將幫助你捕獲許多像這樣的錯誤。 –