Benchmarking Performance

1. Populating an Array

    NSUInteger count = 10000000;
    float *array = malloc(count * sizeof(float));
   
    for (NSUInteger i = 0; i < count; i++)
    {
        array[i] = i;
    }
   

    float initial = 0;
    float increment = 1;
    vDSP_vramp(&initial, &increment, array, 1, count);
   

2. Multiplying an Array

    for (NSUInteger i = 0; i < count; i++)
    {
        array[i] *= 2.0f;
    }
   

    cblas_sscal(count, 2.0f, array, 1);
   

3. Summing an Array

    float sum = 0;
    for (NSUInteger i = 0; i < count; i++)
    {
        sum += array[i];
    }
   

    float sum = cblas_sasum(count, array, 1);
   

4. Searching

    for (NSUInteger i = 0; i < count; i++)
    {
        array[i] = (float)arc4random();
    }
   
    NSUInteger maxLocation = 0;
    for (NSUInteger i = 0; i < count; i++)
    {
        if (array[i] > array[maxLocation])
        {
            maxLocation = i;
        }
    }
   

    NSUInteger maxLocation = cblas_isamax(count, array, 1);