Inference the time a process would take depending on the number of threads

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I have several datasets consisting on:

  • Number of threads n
  • Start process time t1
  • Stop process time t2
  • Operations processed x

So each line of the dataset mean n threads processed x operations in t2-t1 time

When more threads are added, the processing time is reduced, because they run on parallel. However, they have locks between them, so the total time is not (t2 -t1)/n, but a bit more.

I would like to infer the time a process will take to do x operations depending on the thread number, some sort of "parallel factor" so t = x * n * factor gives me the estimated time. How could I achieve this?