I came across peculiar situation which I posted and discussed here:

http://www.unix.com/high-level-programming/81568-semaphore-access-speed....

That discussion did not produce any results, so I want to try it here. In short, I am measuring the speed of system's ability to create a process, which simply accesses a semaphore and dies.

Results are:
modern h/w under SCO OpenServer 5 : 1800 times per sec
same modern h/w under Fedora 2.6.9 : 500 times per sec
old PIII under modern linux (have no info) : 900 times per sec.

I am trying to find a bottleneck on Fedora, why same h/w under old OS does it 3 times faster.

The thread at unix.com has all the info, including my source code, results of strace etc... I don't know the rules - should I post my code here? or just reference to unix.com suffice?

Any info/suggestions would be appreciated.
migurus