MPI Bcast与MPI_Type_create_struct分段错误
我强迫自己用C语言MPI进行个人结构广播。 基本上我已经创建了结构Vector3d。
typedef struct { double x, y, z; } Vector3d; 然后我一直在阅读并为每个MPI流程编写代码。
int rank, size; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_Comm_size(MPI_COMM_WORLD, &size); // MPI Struct para Vector3d int nroItems = 3; int blockLengths[3] = { 1, 1, 1 }; MPI_Datatype types[3] = { MPI_DOUBLE, MPI_DOUBLE, MPI_DOUBLE }; MPI_Datatype MPI_Vector3d; MPI_Aint offsets[3]; offsets[0] = offsetof(Vector3d, x); offsets[1] = offsetof(Vector3d, y); offsets[3] = offsetof(Vector3d, z); MPI_Type_create_struct(nroItems, blockLengths, offsets, types, &MPI_Vector3d); MPI_Type_commit(&MPI_Vector3d);
然后我用这个广播一个Vector3d数组。
Vector3d * num = (Vector3d *) malloc(sizeof(Vector3d) * 10); if(rank == 0) { ... ... MPI_Bcast(num, 10, MPI_Vector3d, 0, MPI_COMM_WORLD); } else { MPI_Bcast(num, 10, MPI_Vector3d, 0, MPI_COMM_WORLD); }
我跑的时候就得到了这个。
[mario-elementary:24020] *** Process received signal *** [mario-elementary:24020] Signal: Segmentation fault (11) [mario-elementary:24020] Signal code: Address not mapped (1) [mario-elementary:24020] Failing at address: 0x56fae13e2cc8 [mario-elementary:24020] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) [0x2b7d6fce7cb0] [mario-elementary:24020] [ 1] /lib/x86_64-linux-gnu/libc.so.6(+0x14ae90) [0x2b7d70040e90] [mario-elementary:24020] [ 2] /usr/lib/libmpi.so.0(+0x3f812) [0x2b7d6fa67812] ... ...etc -------------------------------------------------------------------------- mpirun noticed that process rank 0 with PID 24020 on node mario-elementary exited on signal 11 (Segmentation fault). --------------------------------------------------------------------------
请帮忙！
您的补偿中有一个拼写错误
offsets[3] = offsetof(Vector3d, z);
应该是offset[2] 。 我想这就是解决bcast问题所需要的全部内容。
你的偏移function的结果是什么？ 它是如何工作的？