FPS
November 11th, 2008
FPS measures how accurate a couple of syscalls are.
It all depends on the hardware, and the OS, and the kernel..
Most server processors don’t have power management stuff, therefor, desktop CPUs have too much jitter (SMI interrupt, C3 halt stats) to host high precision applications that
require ultra-accurate nanosleep.
For example, here’s a measurement of usleep wakeup latency on a Linux machine:
0.000018
0.000009
0.000010
0.000015
0.000011
0.000011
0.000012
0.000010
0.000009
That’s a usleep(1000000), the results are never consistant at all. Anyone who says FPS doesn’t do this is full of shit.