Add benchmark/smallscaling.c

* Bench small matrices with multi-threading
* Close #727

benchmark/Makefile

@@ -166,7 +166,8 @@ goto :: slinpack.goto dlinpack.goto clinpack.goto zlinpack.goto \
        sgeev.goto dgeev.goto cgeev.goto zgeev.goto \
        sgetri.goto dgetri.goto cgetri.goto zgetri.goto \
        spotrf.goto dpotrf.goto cpotrf.goto zpotrf.goto \
-       ssymm.goto dsymm.goto csymm.goto zsymm.goto
+       ssymm.goto dsymm.goto csymm.goto zsymm.goto \
+       smallscaling
 
 acml :: slinpack.acml dlinpack.acml clinpack.acml zlinpack.acml \
        scholesky.acml dcholesky.acml ccholesky.acml zcholesky.acml \
@@ -2132,6 +2133,8 @@ cgemm3m.$(SUFFIX) : gemm3m.c
 zgemm3m.$(SUFFIX) : gemm3m.c
 	$(CC) $(CFLAGS) -c -DCOMPLEX -DDOUBLE -o $(@F) $^
 
+smallscaling: smallscaling.c ../$(LIBNAME)
+	$(CC) $(CFLAGS) -lpthread -fopenmp -lm -o $(@F) $^
 
 clean ::
 	@rm -f *.goto *.mkl *.acml *.atlas *.veclib

benchmark/smallscaling.c

@@ -0,0 +1,191 @@
+// run with OPENBLAS_NUM_THREADS=1 and OMP_NUM_THREADS=n
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <cblas.h>
+#include <omp.h>
+#define MIN_SIZE 5
+#define MAX_SIZE 60
+#define NB_SIZE 10
+
+// number of loop for a 1x1 matrix. Lower it if the test is
+// too slow on you computer.
+#define NLOOP 2e7
+
+typedef struct {
+    int matrix_size;
+    int n_loop;
+    void (* bench_func)();
+    void (* blas_func)();
+    void * (* create_matrix)(int size);
+} BenchParam;
+
+void * s_create_matrix(int size) {
+    float * r = malloc(size * sizeof(double));
+    for(int i = 0; i < size; i++)
+        r[i] = 1e3 * i / size;
+    return r;
+}
+
+void * c_create_matrix(int size) {
+    float * r = malloc(size * 2 * sizeof(double));
+    for(int i = 0; i < 2 * size; i++)
+        r[i] = 1e3 * i / size;
+    return r;
+}
+
+void * z_create_matrix(int size) {
+    double * r = malloc(size * 2 * sizeof(double));
+    for(int i = 0; i < 2 * size; i++)
+        r[i] = 1e3 * i / size;
+    return r;
+}
+
+void * d_create_matrix(int size) {
+    double * r = malloc(size * sizeof(double));
+    for(int i = 0; i < size; i++)
+        r[i] = 1e3 * i / size;
+    return r;
+}
+
+void trmv_bench(BenchParam * param)
+{
+    int i, n;
+    int size = param->matrix_size;
+    n = param->n_loop / size;
+    int one = 1;
+    void * A = param->create_matrix(size * size);
+    void * y = param->create_matrix(size);
+    for(i = 0; i < n; i++) {
+        param->blas_func("U", "N", "N", &size, A, &size, y, &one);
+    }
+    free(A);
+    free(y);
+}
+
+void gemv_bench(BenchParam * param)
+{
+    int i, n;
+    int size = param->matrix_size;
+    n = param->n_loop / size;
+    double v = 1.01;
+    int one = 1;
+    void * A = param->create_matrix(size * size);
+    void * y = param->create_matrix(size);
+    for(i = 0; i < n; i++) {
+        param->blas_func("N", &size, &size, &v, A, &size, y, &one, &v, y, &one);
+    }
+    free(A);
+    free(y);
+}
+
+void ger_bench(BenchParam * param) {
+    int i, n;
+    int size = param->matrix_size;
+    n = param->n_loop / size;
+    double v = 1.01;
+    int one = 1;
+    void * A = param->create_matrix(size * size);
+    void * y = param->create_matrix(size);
+    for(i = 0; i < n; i++) {
+        param->blas_func(&size, &size, &v, y, &one, y, &one, A, &size);
+    }
+    free(A);
+    free(y);
+}
+
+#ifndef _WIN32
+void * pthread_func_wrapper(void * param) {
+    ((BenchParam *)param)->bench_func(param);
+    pthread_exit(NULL);
+}
+#endif
+
+#define NB_TESTS 5
+void * TESTS[4 * NB_TESTS] = {
+    trmv_bench, ztrmv_, z_create_matrix, "ztrmv",
+    gemv_bench, dgemv_, d_create_matrix, "dgemv",
+    gemv_bench, zgemv_, z_create_matrix, "zgemv",
+    ger_bench, dger_, d_create_matrix, "dger",
+    ger_bench, zgerc_, z_create_matrix, "zgerc",
+};
+
+inline static double delta_time(struct timespec tick) {
+    struct timespec tock;
+	clock_gettime(CLOCK_MONOTONIC, &tock);
+	return (tock.tv_sec - tick.tv_sec) + (tock.tv_nsec - tick.tv_nsec) / 1e9;
+}
+
+double pthread_bench(BenchParam * param, int nb_threads)
+{
+#ifdef _WIN32
+    return 0;
+#else
+    BenchParam threaded_param = *param;
+    pthread_t threads[nb_threads];
+    int t, rc;
+    struct timespec tick;
+    threaded_param.n_loop /= nb_threads;
+    clock_gettime(CLOCK_MONOTONIC, &tick);
+    for(t=0; t<nb_threads; t++){
+        rc = pthread_create(&threads[t], NULL, pthread_func_wrapper, &threaded_param);
+        if (rc){
+            printf("ERROR; return code from pthread_create() is %d\n", rc);
+            exit(-1);
+        }
+    }
+    for(t=0; t<nb_threads; t++){
+        pthread_join(threads[t], NULL);
+    }
+	return delta_time(tick);
+#endif
+}
+
+double seq_bench(BenchParam * param) {
+    struct timespec tick;
+    clock_gettime(CLOCK_MONOTONIC, &tick);
+    param->bench_func(param);
+    return delta_time(tick);
+}
+
+double omp_bench(BenchParam * param) {
+    BenchParam threaded_param = *param;
+    struct timespec tick;
+    int t;
+    int nb_threads = omp_get_max_threads();
+    threaded_param.n_loop /= nb_threads;
+    clock_gettime(CLOCK_MONOTONIC, &tick);
+    #pragma omp parallel for
+    for(t = 0; t < nb_threads; t ++){
+        param->bench_func(&threaded_param);
+    }
+    return delta_time(tick);
+}
+
+int main(int argc, char * argv[]) {
+    double inc_factor = exp(log((double)MAX_SIZE / MIN_SIZE) / NB_SIZE);
+    BenchParam param;
+    int test_id;
+    printf ("Running on %d threads\n", omp_get_max_threads());
+    for(test_id = 0; test_id < NB_TESTS; test_id ++) {
+        double size = MIN_SIZE;
+        param.bench_func = TESTS[test_id * 4];
+        param.blas_func = TESTS[test_id * 4 + 1];
+        param.create_matrix = TESTS[test_id * 4 + 2];
+        printf("\nBenchmark of %s\n", (char*)TESTS[test_id * 4 + 3]);
+        param.n_loop = NLOOP;
+        while(size <= MAX_SIZE) {
+            param.matrix_size = (int)(size + 0.5);
+            double seq_time = seq_bench(&param);
+            double omp_time = omp_bench(&param);
+            double pthread_time = pthread_bench(&param, omp_get_max_threads());
+            printf("matrix size %d, sequential %gs, openmp %gs, speedup %g, "
+                   "pthread %gs, speedup %g\n",
+                   param.matrix_size, seq_time,
+                   omp_time, seq_time / omp_time,
+                   pthread_time, seq_time / pthread_time);
+            size *= inc_factor;
+        }
+    }
+}