Plot time differences when running fewer than all threads.

[bhorvitz]

More of a question of curiosity than anything else.. I have a fairly robust setup making plots in 6.2 minutes on all cores - that's 80 threads over 2 CPUs. If I want to save a little overhead for moving files around and such, and go to 76 threads, plot times increase to 6.7 minutes, which is reasonable. What's interesting is if I go to 74 threads, plot times jump to 8.9 minutes.

Is this expected behavior? The only interesting thing I notice is that when running any number fewer than all threads, it will not split them evenly between the CPUs. 76 gives me 40 on CPU 1 and 36 on CPU 2. Not sure if that matters.

And thanks for the excellent plotter!

[bhorvitz]

Never mind the second part. I am mistaken on the thread allocation. It does divide evenly between the CPUs. Just a bit curious on the non-linear time increase.