69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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struct thread_arg {
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const float *A;
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const float *B;
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float *C;
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int M;
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int N;
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int K;
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int num_threads;
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int rank; /* id of this thread */
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} args[256];
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static pthread_t threads[256];
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static void* matmul_kernel(void *arg) {
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struct thread_arg *_arg = (struct thread_arg*) arg;
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const float *A = _arg->A;
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const float *B = _arg->B;
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float *C = _arg->C;
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int M = _arg->M;
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int N = _arg->N;
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int K = _arg->K;
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int num_threads = _arg-> num_threads;
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int rank = _arg->rank;
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int start = ((M + num_threads-1) / num_threads) * rank;
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int end = ((M + num_threads-1) / num_threads) * (rank+1);
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if (end >= M) end = M;
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for (int i = start; i < end; ++i) {
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for (int k = 0; k < K; ++k) {
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for (int j = 0; j < N; ++j) {
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C[i * N + j] += A[i * K + k] * B[k * N + j];
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}
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}
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}
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return NULL;
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}
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void matmul(const float *A, const float *B, float *C, int M, int N, int K, int num_threads) {
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int err;
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for (int t = 0; t < num_threads; ++t) {
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args[t].A = A;
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args[t].B = B;
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args[t].C = C;
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args[t].M = M;
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args[t].N = N;
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args[t].K = K;
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args[t].num_threads = num_threads;
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args[t].rank = t;
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err = pthread_create(&threads[t], NULL, matmul_kernel, (void*)&args[t]);
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if (err) {
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printf("pthread_create(%d) failed with err %d\n", t, err);
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exit(EXIT_FAILURE);
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}
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}
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for (int t = 0; t < num_threads; ++t) {
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err = pthread_join(threads[t], NULL);
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if (err) {
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printf("pthread_join(%d) failed with err %d\n", t, err);
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exit(EXIT_FAILURE);
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}
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}
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}
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