I have an odd problem I am not sure how to analyze further - there is a pretty lighweight website running on a pretty good box(Xeon, 4Gb ram, SATA). Judging by access logs, it get's about 120 requests per second.
Load avg. on a box is jumping between 5 and 20 pretty much randomly, but rarely drops below 10. CPU utilization is at about 70% avg and is quite consistent. There is a lot of apache processes and they all seem to be locking at some point on something which causes load. avg to jump above 15, I can't quite figure out how to find out what they locking on.
What can I use to see what's going on inside apache process itself and where it blocks?