One point we noticed in our example for concurrent image processing is that the task of spawning processes takes a considerable amount of time. Due to this, if the number of processes available to analyze the data is too high in comparison to the amount of input, the improvement in execution time received from increasing the number of working processes will diminish and sometimes even become negative.
However, there is no concrete way to tell whether a specific number of separate processes is appropriate for a program unless we also take into account its input images. For example, if the input images are relatively large files, and it takes a significant amount of time for the program to load them ...
