Performance difference for multi-thread and multi-process

Question

A few years ago, in the Windows environment, I did some testing, by letting multiple instances of CPU computation intensive + memory access intensive + I/O access intensive

Answer 1

I found this is true as well. but I think it has something to do with the scheduling. because if you run it long enough, the multi-processes is just as fast as multi-threads. that number is about 10 seconds. if the algorithm needs to be run for 10 seconds. the multi-processes is as fast as multi-thread. but if it only needs to be run for less than 1 second. multi-processes is much,much faster than multi-thread.