我最近开始学习MPI,你可能已经猜到了,我已经遇到了一个我自己无法解决的错误!
我想编写一个将两个矩阵相乘的程序。然而,我还没有那么远,事实上,我一开始就坚持广播矩阵。
#define MASTER 0
if (rank == MASTER) {
A = (double *) malloc(N * N * sizeof(double));
B = (double *) malloc(N * N * sizeof(double));
matFillRand(N, A);
matFillRand(N, B);
}
if (rank == MASTER) {
P = (double *) malloc(N * N * sizeof(double));
}
matMulMPI(N, A, B, P);
if (rank == MASTER) {
printMatrix(N, P);
}
(理论上)数学运算的函数如下:
void matMulMPI(long N, double *a, double *b, double *c) {
long i, j, k;
int rank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Bcast(&N, 1, MPI_LONG, MASTER, MPI_COMM_WORLD);
MPI_Bcast(b, N*N, MPI_DOUBLE, MASTER, MPI_COMM_WORLD);
printMatrix(N, b);
//TO-DO: Broadcast A
//TO-DO: Do Math
}
这个广播不起作用。我收到以下消息:
*处理接收信号 信号:分段错误(11)信号代码:无效权限(2)地址失败:0x401560信号: 分段错误(11)信号代码:无效权限(2)失败 地址:0x401560 [0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340)[0x7fc3ede6b340] [1] /lib/x86_64-linux-gnu/libc.so.6(+0x981c0)[0x7fc3edb2e1c0] [2] /usr/lib/libmpi.so.1(opal_convertor_unpack+0x105)[0x7fc3ee1788d5] [ 3] /usr/lib/openmpi/lib/openmpi/mca_pml_ob1.so(mca_pml_ob1_recv_frag_callback_match+0x460) [0x7fc3e6587630] [4] /usr/lib/openmpi/lib/openmpi/mca_btl_sm.so(mca_btl_sm_component_progress+0x487) [0x7fc3e572a137] [5] /usr/lib/libmpi.so.1(opal_progress+0x5a) [0x7fc3ee1849ea] [6] /usr/lib/libmpi.so.1(ompi_request_default_wait+0x16d)[0x7fc3ee0d1c0d] [7] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_generic+0x49e) [0x7fc3e486da9e] [8] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_binomial+0xb7) [0x7fc3e486df27] [9] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_dec_fixed+0xcc) [0x7fc3e486573c] [10] /usr/lib/openmpi/lib/openmpi/mca_coll_sync.so(mca_coll_sync_bcast+0x64) [0x7fc3e4a7d6a4] [11] /usr/lib/libmpi.so.1(MPI_Bcast+0x13d) [0x7fc3ee0df78d] [12] ./matMul()[0x4011a9] [13] ./matMul()[0x401458] [14] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fc3edab7ec5] [15] ./matMul()[0x400b49] 错误消息 [0] /lib/x86_64-linux-gnu/libpthread.so.0( + 0x10340)[0x7fa4a1fe5340] [1] /lib/x86_64-linux-gnu/libc.so.6(+0x981c0)[0x7fa4a1ca81c0] [2] /usr/lib/libmpi.so.1(opal_convertor_unpack+0x105)[0x7fa4a22f28d5] [ 3] /usr/lib/openmpi/lib/openmpi/mca_pml_ob1.so(mca_pml_ob1_recv_frag_callback_match+0x460) [0x7fa49a701630] [4] /usr/lib/openmpi/lib/openmpi/mca_btl_sm.so(mca_btl_sm_component_progress+0x487) [0x7fa4998a4137] [5] /usr/lib/libmpi.so.1(opal_progress+0x5a) [0x7fa4a22fe9ea] [6] /usr/lib/libmpi.so.1(ompi_request_default_wait+0x16d)[0x7fa4a224bc0d] [7] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_generic+0x4e0) [0x7fa4989e7ae0] [8] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_binomial+0xb7) [0x7fa4989e7f27] [9] /usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_bcast_intra_dec_fixed+0xcc) [0x7fa4989df73c] [10] /usr/lib/openmpi/lib/openmpi/mca_coll_sync.so(mca_coll_sync_bcast+0x64) [0x7fa498bf76a4] [11] /usr/lib/libmpi.so.1(MPI_Bcast+0x13d) [0x7fa4a225978d] [12] ./matMul()[0x4011a9] [13] ./matMul()[0x401458] [14] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fa4a1c31ec5] [15] ./matMul()[0x400b49] 错误消息结束* -------------------------------------------------- ------------------------ mpirun注意到进程在节点上具有PID 12466的等级2 rtidev5.etf.bg.ac.rs退出信号11(分段故障)。 -------------------------------------------------- ------------------------ 2个进程被杀死(有些可能是在清理过程中被mpirun攻击)
答案 0 :(得分:2)
我已经弄清楚了。所有进程(不仅是主进程)都需要先分配内存。
所以缺少的一行是
void matMulMPI(long N, double *a, double *b, double *c) {
...
MPI_Bcast(&N, 1, MPI_LONG, MASTER, MPI_COMM_WORLD);
b = (double *) malloc(N * N * sizeof(double));
MPI_Bcast(b, N*N, MPI_DOUBLE, MASTER, MPI_COMM_WORLD);
...
}