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col_matrix_lat_vector.c
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col_matrix_lat_vector.c
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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <mpi.h>
#define TAG_INDEXED 999
#if 0
#define MAX_ELEM 10
#define NB_WARMUP 0
#define NB_LOOPS 1
#else
#define MAX_ELEM 4096
#define NB_WARMUP 1000
#define NB_LOOPS 10000
#endif
#define OPT_INT 0
#define OPT_DOUBLE 1
/*
* code that sends a matrix column
* and measures the time spent
*
* The part that is sent is represented below:
*
* V
[00][00] ................. [00][CC] .................. [00][99]
[01][00] ................. [01][CC] .................. [01][99]
[02][00] ................. [02][CC] .................. [02][99]
...
[97][00] ................. [97][CC] .................. [97][99]
[98][00] ................. [98][CC] .................. [98][99]
[99][00] ................. [99][CC] .................. [99][99]
*/
double snd_matrix_double[MAX_ELEM][MAX_ELEM];
double rcv_matrix_double[MAX_ELEM][MAX_ELEM];
double ref_rcv_matrix_double[MAX_ELEM][MAX_ELEM];
int snd_matrix_int[MAX_ELEM][MAX_ELEM];
int rcv_matrix_int[MAX_ELEM][MAX_ELEM];
int ref_rcv_matrix_int[MAX_ELEM][MAX_ELEM];
void init_matrices(int opt, int col, int blocklen)
{
int i, j;
/*
* Init the matrices
*/
if (opt == OPT_DOUBLE) {
for (i = 0; i < MAX_ELEM; i++) {
for (j = 0; j < MAX_ELEM; j++) {
snd_matrix_double[i][j] = 1.0 * i * MAX_ELEM + j;
rcv_matrix_double[i][j] = -1.0;
ref_rcv_matrix_double[i][j] = -1.0;
}
for( j = 0; j < blocklen; j++ ) {
snd_matrix_double[i][col+j] = 1.0 * i * MAX_ELEM + col + j;
ref_rcv_matrix_double[i][col+j] = 1.0 * i * MAX_ELEM + col + j;
}
}
} else {
for (i = 0; i < MAX_ELEM; i++) {
for (j = 0; j < MAX_ELEM; j++) {
snd_matrix_int[i][j] = i * MAX_ELEM + j;
rcv_matrix_int[i][j] = -1;
ref_rcv_matrix_int[i][j] = -1;
}
for( j = 0; j < blocklen; j++ ) {
snd_matrix_int[i][col+j] = 1.0 * i * MAX_ELEM + col + j;
ref_rcv_matrix_int[i][col+j] = i * MAX_ELEM + col + j;
}
}
}
}
void warmup(int my_rank, int col, int blocklen, MPI_Datatype dtt, int opt)
{
MPI_Status status;
int i, j;
int errors;
void *ptr_send, *ptr_recv;
if (!NB_WARMUP) return;
if (opt == OPT_DOUBLE) {
ptr_send = &(snd_matrix_double[0][col]);
ptr_recv = &(rcv_matrix_double[0][col]);
} else {
ptr_send = &(snd_matrix_int[0][col]);
ptr_recv = &(rcv_matrix_int[0][col]);
}
if (!my_rank) {
for (i = 0; i < NB_WARMUP; i++) {
MPI_Send(ptr_send, 1, dtt, 1, TAG_INDEXED, MPI_COMM_WORLD);
MPI_Recv(ptr_recv, 1, dtt, 1, TAG_INDEXED, MPI_COMM_WORLD, &status);
}
} else {
for (i = 0; i < NB_WARMUP; i++) {
MPI_Recv(ptr_recv, 1, dtt, 0, TAG_INDEXED, MPI_COMM_WORLD, &status);
MPI_Send(ptr_send, 1, dtt, 0, TAG_INDEXED, MPI_COMM_WORLD);
}
/* Check for errors */
errors = 0;
for (i = 0; i < MAX_ELEM; i++) {
for (j = 0; j < MAX_ELEM; j++) {
if (opt == OPT_DOUBLE) {
if (rcv_matrix_double[i][j] != ref_rcv_matrix_double[i][j]) {
printf("!!!!!!!!! rcv_matrix[%d][%d] : expected %f GOT %f\n", i, j, ref_rcv_matrix_double[i][j], rcv_matrix_double[i][j]);
errors++;
}
} else {
if (rcv_matrix_int[i][j] != ref_rcv_matrix_int[i][j]) {
printf("!!!!!!!!! rcv_matrix[%d][%d] : expected %d GOT %d\n", i, j, ref_rcv_matrix_int[i][j], rcv_matrix_int[i][j]);
errors++;
}
}
}
}
if (errors) {
printf("FOUND %d errors", errors);
printf(" )-:\n");
}
#if 0
else { printf("w000t!!!\n"); }
#endif
}
}
int main(int argc, char **argv)
{
double t_beg, t_end;
double latency;
int i, col, opt, blocklen = 1, blocklen_pos = 3;
int size, rank;
char *type;
void *ptr_send, *ptr_recv;
MPI_Datatype newtype;
MPI_Status status;
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (size != 2) {
if (!rank) {
printf("shoulf be run with 2 ranks!!!!\n");
}
MPI_Finalize();
exit(1);
}
if (argc < 3) {
if (!rank) {
printf("Syntax: %s <column number> {double|int} [blocklen=1]\n", argv[0]);
}
MPI_Finalize();
exit(1);
}
col = atoi(argv[1]);
if (col < 0 || col >= MAX_ELEM) {
if (!rank) {
printf("%s: <column number> should be >= 0 and < %d\n", argv[0], MAX_ELEM);
}
MPI_Finalize();
exit(1);
}
type = argv[2];
if (strcmp(type, "double")) {
if (strcmp(type, "int")) {
if (!rank) {
printf("Syntax: %s <column number> {double|int}\n", argv[0]);
}
MPI_Finalize();
exit(1);
} else {
opt = OPT_INT;
ptr_send = &(snd_matrix_int[0][col]);
ptr_recv = &(rcv_matrix_int[0][col]);
}
} else {
opt = OPT_DOUBLE;
ptr_send = &(snd_matrix_double[0][col]);
ptr_recv = &(rcv_matrix_double[0][col]);
}
if (rank == 0) {
fprintf(stdout, "(%s) LATENCY MATRIX %d x %d %ss (usecs)\n",
argv[0], MAX_ELEM, MAX_ELEM,
(opt == OPT_INT) ? "int" : "double");
fflush(stdout);
}
while( argc > blocklen_pos ) {
blocklen = atoi(argv[blocklen_pos]);
if( (blocklen < 1) || ((col + blocklen) > MAX_ELEM) ) {
if(!rank) {
printf("When col = %d blocklen must be [1 .. %d[\n", col, MAX_ELEM-col);
MPI_Finalize();
exit(1);
}
}
blocklen_pos++;
/*
* count = # of blocks
* blocklen = # of elems of oldtype in each block
* stride = displacement of each block (in # of elems) wrt beginning
*/
MPI_Type_vector(MAX_ELEM, blocklen, MAX_ELEM,
(opt == OPT_INT) ? MPI_INT : MPI_DOUBLE, &newtype);
MPI_Type_commit(&newtype);
init_matrices(opt, col, blocklen);
warmup(rank, col, blocklen, newtype, opt);
t_beg = MPI_Wtime();
if (rank == 0) {
for (i = 0; i < NB_LOOPS; i++) {
MPI_Send(ptr_send, 1, newtype, 1, TAG_INDEXED, MPI_COMM_WORLD);
MPI_Recv(ptr_recv, 1, newtype, 1, TAG_INDEXED, MPI_COMM_WORLD, &status);
}
} else {
for (i = 0; i < NB_LOOPS; i++) {
MPI_Recv(ptr_recv, 1, newtype, 0, TAG_INDEXED, MPI_COMM_WORLD, &status);
MPI_Send(ptr_send, 1, newtype, 0, TAG_INDEXED, MPI_COMM_WORLD);
}
}
t_end = MPI_Wtime();
if (rank == 0) {
latency = (t_end - t_beg) * 1e6 / (2.0 * NB_LOOPS);
fprintf(stdout, "col=%d blocklen=%d -----------------> %f usecs\n", col, blocklen, latency);
fflush(stdout);
}
MPI_Type_free(&newtype);
}
MPI_Finalize();
exit(0);
}