ps O Marks a process running on a processor

hi all...

noticing something in ps that i'm not familiar with:

www 4549 99.0 0.1 220736 22380 ? O Tue12PM 9658:27.67 /usr/pkg/sbin/httpd -k start

www 1998 97.6 0.1 218684 22776 ? O Wed09PM 7711:10.83 /usr/pkg/sbin/httpd -k start

www 9931 97.4 0.2 220736 26092 ? O Tue12PM 9622:31.82 /usr/pkg/sbin/httpd -k start

www 19355 98.0 0.5 285244 84204 ? O Fri09AM 5578:24.35 /usr/pkg/sbin/httpd -k start

www 6122 0.0 0.2 220732 26912 ? S 11:50AM 0:00.63 /usr/pkg/sbin/httpd -k start

www 6641 0.0 0.2 217660 25392 ? S 11:53AM 0:00.23 /usr/pkg/sbin/httpd -k start

according to the man ps stat O stands for "Marks a process running on a processor". what does that mean?

in top these look like:

9931 www 25 0 216M 25M CPU/4 160.5H 99.27% 99.27% httpd

4549 www 25 0 216M 22M CPU/1 161.1H 97.80% 97.80% httpd

19355 www 25 0 279M 82M CPU/5 93.1H 93.65% 93.65% httpd

1998 www 25 0 214M 22M CPU/7 128.6H 90.58% 90.58% httpd

that looks bit extreme to me. some sort of a leak?!

thanks...