63 строки
2.5 KiB
C
63 строки
2.5 KiB
C
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#include "nbc.h"
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/* an gatherv schedule can not be cached easily because the contents
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* ot the recvcounts array may change, so a comparison of the address
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* would not be sufficient ... we simply do not cache it */
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/* simple linear MPI_Igatherv */
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int NBC_Igatherv(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int *recvcounts, int *displs, MPI_Datatype recvtype, int root, MPI_Comm comm, NBC_Handle* handle) {
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int rank, p, res, i;
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MPI_Aint rcvext;
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NBC_Schedule *schedule;
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char *rbuf, inplace;
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NBC_IN_PLACE(sendbuf, recvbuf, inplace);
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res = NBC_Init_handle(handle, comm);
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if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
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res = MPI_Comm_rank(comm, &rank);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Comm_size(comm, &p);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Type_extent(recvtype, &rcvext);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
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schedule = malloc(sizeof(NBC_Schedule));
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if (NULL == schedule) { printf("Error in malloc() (%i)\n", res); return res; }
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handle->tmpbuf=NULL;
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res = NBC_Sched_create(schedule);
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if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
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/* send to root */
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if(rank != root) {
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/* send msg to root */
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res = NBC_Sched_send(sendbuf, false, sendcount, sendtype, root, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
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} else {
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for(i=0;i<p;i++) {
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rbuf = ((char *)recvbuf) + (displs[i]*rcvext);
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if(i == root) {
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if(!inplace) {
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/* if I am the root - just copy the message */
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res = NBC_Copy(sendbuf, sendcount, sendtype, rbuf, recvcounts[i], recvtype, comm);
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if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
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}
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} else {
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/* root receives message to the right buffer */
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res = NBC_Sched_recv(rbuf, false, recvcounts[i], recvtype, i, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
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}
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}
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}
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res = NBC_Sched_commit(schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
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res = NBC_Start(handle, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Start() (%i)\n", res); return res; }
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return NBC_OK;
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}
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