Here is my theory. After warmup, every call to busyPause() takes 5 seconds.
During that time the thread will be interrupted many times. Even if it is
run
on the same CPU after every interrupt, the cache state will be gone.
Basically, what you measure after busyPause() is repopulating your caches.
To test this theory, add one line after busyPause() which does that
proactively
before measurement:
double x = busyPause(interval);
+ calculation += x / (rand.nextInt(5) + 1);
-- Oleg
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