Benchmark of cudaMalloc. Allocate 1MB of memory totally with several block sizes

cudaMallocBench.cu

#include <sys/time.h>
#include <cuda_runtime.h>
#include <stdio.h>

inline double seconds()
{
    struct timeval tp;
    struct timezone tzp;
    int i = gettimeofday(&tp, &tzp);
    return ((double)tp.tv_sec + (double)tp.tv_usec * 1.e-6);
}

int total_size = 1024 * 1024; // 1MB

void test(int size)
{
    double iStart, iElaps;
    int num = total_size / size;
    float *d[num];

    iStart = seconds();
    for (int i = 0; i < num; i++) {
      cudaMalloc((float**)&d[i], size);
    }
    iElaps = seconds() - iStart;
    printf("cudaMalloc(%d) x %d Time elapsed %f sec\n", size, num, iElaps);

    iStart = seconds();
    for (int i = 0; i < num; i++) {
      cudaFree(d[i]);
    }
    iElaps = seconds() - iStart;
    printf("cudaFree(%d) x %d Time elapsed %f sec\n", size, num, iElaps);
}

int main(int argc, char **argv)
{
    printf("%s Starting...\n", argv[0]);

    // set up device
    int dev = 0;
    cudaDeviceProp deviceProp;
    cudaGetDeviceProperties(&deviceProp, dev);
    printf("Using Device %d: %s\n", dev, deviceProp.name);
    cudaSetDevice(dev);

    int size = atoi(argv[1]);
    test(size);

    return(0);
}