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rdma_test.c
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rdma_test.c
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#include "ib.h"
#include "pmiclient.h"
resource_t res;
int connect_qp(resource_t *res, int ib_port, int gid_idx, int myrank);
#define SIZE 128
#define RDMA_MIN_SIZE 4096
#define RDMA_MAX_SIZE 1024*1024 /* size は alignment が大事かもしれない */
#define STEP RDMA_MIN_SIZE
char buf[SIZE];
void display_received(char * received, int length)
{
printf("*** ");
for (int i = 0; i < 6; ++i) {
printf("%d ", received[i]);
}
printf("... ");
for (int i = length-5; i < length; ++i) {
printf("%d ", received[i]);
}
printf("\n");
}
int
main()
{
int ib_port = 1;
int gid_idx = 1;
int rc;
int rank, nprocs;
struct ibv_sge sge_list;
struct ibv_wc wc;
struct ibv_send_wr *sr;
unsigned long long start, end;
float time;
mypmiInit(&rank, &nprocs);
fprintf(stderr, "[%d] nprocs(%d)\n", rank, nprocs);
rc = resource_create(&res, ib_port, rank);
gid_idx = rank;
rc = connect_qp(&res, ib_port, gid_idx, rank);
create_sge(&res, buf, SIZE, &sge_list);
memset(&wc, 0, sizeof(struct ibv_wc));
sr = malloc(sizeof(*sr));
memset(sr, 0, sizeof(*sr));
mypmiBarrier();
fprintf(stderr, "[%d] START\n", rank);
memset(buf, 0, SIZE);
mypmiBarrier();
if (rank == 0) {
struct ibv_mr *mr;
for (int size = RDMA_MIN_SIZE; size < RDMA_MAX_SIZE; size += STEP) {
char *received = calloc(size, sizeof(char));
mr = ibv_reg_mr(res.pd, received, size, IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE);
INT_TO_BE(buf, mr->rkey);
INT_TO_BE(buf + 4, (((intptr_t)mr->addr) >> 32));
INT_TO_BE(buf + 8, (((intptr_t)mr->addr) & 0xffffffff));
if (post_ibsend(&res, IBV_WR_SEND, &sge_list, sr, 1)) {
fprintf(stderr, "[%d] failed to post SR\n", rank);
goto end;
}
while ((rc = poll_cq(&res, &wc, 1, SCQ_FLG)) == 0) {
}
/* printf("[%d] memory region is sent. key(%x) addr(%lx) rc(%d)\n", rank, mr->rkey, (intptr_t)mr->addr, rc); */
/* wait for done */
post_ibreceive(&res, &sge_list, 1);
while (poll_cq(&res, &wc, 1, RCQ_FLG) == 0) {
}
/* printf("[%d] %d byte has received (opcode=%d)\n", rank, wc.byte_len, wc.opcode); */
/* printf("[%d] Received message: %s\n", rank, buf); */
/* display_received(received, size); */
ibv_dereg_mr(mr);
free(received);
}
} else {
struct ibv_mr *mr;
struct ibv_sge sge;
struct ibv_send_wr wr, *bad_wr;
uint32_t peer_key;
uint64_t peer_addr;
for (int size = RDMA_MIN_SIZE; size < RDMA_MAX_SIZE; size += STEP) {
char *content = malloc(size);
/* receive_peer_mr */
post_ibreceive(&res, &sge_list, 1);
while (poll_cq(&res, &wc, 1, RCQ_FLG) == 0) {
}
/* printf("[%d] receive remote addr: %d byte has received (opcode=%d)\n", rank, wc.byte_len, wc.opcode); */
peer_key = BE_TO_INT(buf);
peer_addr = BE_TO_INT(buf + 4);
peer_addr = (peer_addr << 32) | BE_TO_INT(buf + 8);
/* printf("[%d] remote key %x, remote addr %lx\n", rank, peer_key, peer_addr); */
mr = ibv_reg_mr(res.pd, content, size, IBV_ACCESS_LOCAL_WRITE);
for (int i = 0; i < size; i += 6) {
strncpy(content + i, "Hello!", 6);
}
memset(&wr, 0, sizeof(wr));
sge.addr = (intptr_t)content;
sge.length = size;
sge.lkey = mr->lkey;
wr.sg_list = &sge;
wr.num_sge = 1;
wr.opcode = IBV_WR_RDMA_WRITE;
wr.wr.rdma.remote_addr = peer_addr;
wr.wr.rdma.rkey = peer_key;
/* printf("[%d] Queue post_send RDMA\n", rank); */
start = getCPUCounter();
ibv_post_send(res.qp, &wr, &bad_wr);
while ((rc = poll_cq(&res, &wc, 1, SCQ_FLG)) == 0) {
}
end = getCPUCounter();
ibv_dereg_mr(mr);
free(content);
printf("[%d] Complete post_send %d bytes RDMA rc(%d)\n", rank, size, rc);
time = ((float)(end - start))/((float)MHZ);
printf(" %d clock %f usec\n", (int)(end - start), time);
/* notify done */
sprintf(buf, "Done.");
if (post_ibsend(&res, IBV_WR_SEND, &sge_list, sr, 1)) {
fprintf(stderr, "[%d] failed to post SR\n", rank);
goto end;
}
while ((rc = poll_cq(&res, &wc, 1, SCQ_FLG)) == 0) {
}
/* printf("[%d] Complete post_send Done rc(%d)\n", rank, rc); */
}
}
mypmiBarrier();
end:
resource_destroy(&res);
return 0;
}