5

只要包含 MPI_GET 调用，以下简短的 Fortran90 程序就会崩溃。Rank 1 尝试从 rank 0 中读取一个值并在 MPI_WIN_UNLOCK 中挂起。等级 0 尝试在 MPI_BARRIER 中崩溃并出现分段错误。

我反复检查命令的语法，但它们似乎是正确的。C/C++ 中的类似代码在同一系统上工作。

我正在使用 OpenMPI 1.4.3 和 gfortran 4.4.5。

PROGRAM mpitest
USE mpi
IMPLICIT NONE

INTEGER :: ierr, npe, rnk, win
INTEGER (KIND=MPI_ADDRESS_KIND) lowerbound, sizeofreal
REAL :: val = 1.0, oval = 2.0

CALL MPI_INIT( ierr )
CALL MPI_COMM_RANK( MPI_COMM_WORLD, rnk, ierr )
CALL MPI_COMM_SIZE( MPI_COMM_WORLD, npe, ierr )

CALL MPI_TYPE_GET_EXTENT(MPI_REAL, lowerbound, sizeofreal, ierr)

CALL MPI_WIN_CREATE(val, sizeofreal, sizeofreal, MPI_INFO_NULL, MPI_COMM_WORLD, win, ierr)

IF( rnk .EQ. 1 ) THEN
   CALL MPI_WIN_LOCK( MPI_LOCK_SHARED, 0, 0, win, ierr )
   CALL MPI_GET( oval, 1, MPI_REAL, 0, 0, 1, MPI_REAL, win, ierr )
   CALL MPI_WIN_UNLOCK( 0, win, ierr )
END IF

CALL MPI_BARRIER( MPI_COMM_WORLD, ierr )
CALL MPI_WIN_FREE(win, ierr)
CALL MPI_FINALIZE(ierr)

END PROGRAM mpitest

mpif90 mpitest.f90
mpirun -n 2 ./a.out

*** Process received signal ***
Signal: Segmentation fault (11)
Signal code: Address not mapped (1)
Failing at address: 0x34006020a0
[ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x36420) [0x7f2d1c8c1420]
[ 1] /lib/x86_64-linux-gnu/libc.so.6(+0x13ae70) [0x7f2d1c9c5e70]
[ 2] /usr/lib/libmpi.so.0(ompi_convertor_pack+0x199) [0x7f2d1c61d629]
[ 3] /usr/lib/openmpi/lib/openmpi/mca_osc_pt2pt.so(+0x56b0) [0x7f2d166876b0]
[ 4] /usr/lib/openmpi/lib/openmpi/mca_osc_pt2pt.so(+0x3a81) [0x7f2d16685a81]
[ 5] /usr/lib/openmpi/lib/openmpi/mca_osc_pt2pt.so(+0x23ac) [0x7f2d166843ac]
[ 6] /usr/lib/libopen-pal.so.0(opal_progress+0x5b) [0x7f2d1ba700db]
[ 7] /usr/lib/libmpi.so.0(+0x35635) [0x7f2d1c60f635]
[ 8] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(+0x1afa) [0x7f2d1688eafa]
[ 9] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(+0x958f) [0x7f2d1689658f]
[10] /usr/lib/libmpi.so.0(MPI_Barrier+0x8d) [0x7f2d1c6250cd]
[11] /usr/lib/libmpi_f77.so.0(PMPI_BARRIER+0x13) [0x7f2d1cf661d3]
[12] ./a.out() [0x401003]
[13] ./a.out(main+0x34) [0x401058]
[14] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f2d1c8ac30d]
[15] ./a.out() [0x400da9]
*** End of error message ***
4

1 回答 1

7

这是一个棘手的问题，但线索来自以下事实：段错误发生在一个不相关且完全安全的例程中，MPI_Barrier(). 问题是存在堆栈损坏。

根本问题只是参数类型不匹配（我希望 MPI Fortran 绑定能够捕获，但没有）。MPI_Get的目标位移参数是kind的整数MPI_ADDRESS_KIND，但您只是传递给它一个整数。

如果您将lowerbound其用作目标偏移量，或者将传入的 0 显式提升为 MPI_ADDRESS_KIND 类型，则您的程序可以正常工作。

于 2012-06-15T14:46:43.210 回答