top: where to find process state descriptions (i.e. STATE usem)?

[O. Hartmann]

Hello.
Try to find docs about the process states shown in top, but I can't find 
any hint for explanations what the abbrev. do mean.

I have a problem with a scientific program using OpenMP showing STATE 
'usem' in top. Problem: the small program is much slower on a dual or 
four core CPU using OpenMP than using only a single core (single thread 
never show state 'usem' in top).

Any help?

Thanks in advance, and regards,
Oliver