Neko  0.9.99
A portable framework for high-order spectral element flow simulations
device_mpi.c
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34 
40 #include <stdlib.h>
41 #include <mpi.h>
42 #ifdef _OPENMP
43 #include <omp.h>
44 #endif
45 
46 #include <comm/comm.h>
47 
48 void device_mpi_init_reqs(int n, void **reqs_out) {
49  MPI_Request *reqs = malloc(n * sizeof(MPI_Request));
50  *reqs_out = reqs;
51 }
52 
53 void device_mpi_free_reqs(void **reqs) {
54  free(*reqs);
55  *reqs = NULL;
56 }
57 
58 void device_mpi_isend(void *buf_d, int offset, int nbytes, int rank,
59  void *vreqs, int i) {
60  MPI_Request *reqs = vreqs;
61 #ifdef _OPENMP
62  int tid = omp_get_thread_num();
63 #else
64  int tid = 0;
65 #endif
66  MPI_Isend(buf_d+offset, nbytes, MPI_BYTE, rank, tid, NEKO_COMM, &reqs[i-1]);
67 }
68 
69 void device_mpi_irecv(void *buf_d, int offset, int nbytes, int rank,
70  void *vreqs, int i) {
71  MPI_Request *reqs = vreqs;
72 #ifdef _OPENMP
73  int tid = omp_get_thread_num();
74 #else
75  int tid = 0;
76 #endif
77 
78  MPI_Irecv(buf_d+offset, nbytes, MPI_BYTE, rank, tid, NEKO_COMM, &reqs[i-1]);
79 }
80 
81 int device_mpi_test(void *vreqs, int i) {
82  MPI_Request *reqs = vreqs;
83  int flag = 0;
84  MPI_Test(&reqs[i-1], &flag, MPI_STATUS_IGNORE);
85  return flag;
86 }
87 
88 void device_mpi_waitall(int n, void *vreqs) {
89  MPI_Request *reqs = vreqs;
90  MPI_Waitall(n, reqs, MPI_STATUSES_IGNORE);
91 }
92 
93 int device_mpi_waitany(int n, void *vreqs, int *i) {
94  MPI_Request *reqs = vreqs;
95  int j;
96  MPI_Waitany(n, reqs, &j, MPI_STATUSES_IGNORE);
97  if (j == MPI_UNDEFINED) {
98  return 0;
99  } else {
100  *i = j + 1;
101  return 1;
102  }
103 }
MPI_Comm NEKO_COMM
Definition: comm_wrapper.c:10
const int i
const int j
void device_mpi_init_reqs(int n, void **reqs_out)
Definition: device_mpi.c:48
void device_mpi_isend(void *buf_d, int offset, int nbytes, int rank, void *vreqs, int i)
Definition: device_mpi.c:58
int device_mpi_test(void *vreqs, int i)
Definition: device_mpi.c:81
void device_mpi_waitall(int n, void *vreqs)
Definition: device_mpi.c:88
void device_mpi_irecv(void *buf_d, int offset, int nbytes, int rank, void *vreqs, int i)
Definition: device_mpi.c:69
void device_mpi_free_reqs(void **reqs)
Definition: device_mpi.c:53
int device_mpi_waitany(int n, void *vreqs, int *i)
Definition: device_mpi.c:93