Boost Timer Resolution on Ubuntu

[rymjones]

I wrote a timer service in C++ using the Boost 1.43(deadline_timer) w/ 1 ms resolution and unit tested in on RHEL. We switched OS to Ubuntu 10.4 now the highest resolution I can achieve is 4 ms. Even if I set the expiration time to 1 it will fire on the next closest 4 ms interval.

I am not sure whether this is a problem in Boost or if there is some setup in Ubuntu?

[worksofcraft]

I wrote a timer service in C++ using the Boost 1.43(deadline_timer) w/ 1 ms resolution and unit tested in on RHEL. We switched OS to Ubuntu 10.4 now the highest resolution I can achieve is 4 ms. Even if I set the expiration time to 1 it will fire on the next closest 4 ms interval.

I am not sure whether this is a problem in Boost or if there is some setup in Ubuntu?

No it is problem in the kernel

Historically the timer interrupt was electronically derived from the mains, so it had a resolution of 100Hz (zero crossings) or 120Hz in some countries, so POSIX doesn't promise to deliver any better than that.