Understanding high CPU utilization

Hello informix pros, I'm a unix systems administrator looking at a performance problem on a machine whose only function in life is to run a version 7.2 informix database. CPU utilization on the box is almost always 100% with user time being around 90%, all of it is from oninit. There is no paging, minimal disk activity and minimal user activity. The hardware is an IBM SP2 wide node running aix4.1.4. After looking at the output of various onstat commands I found something that looks somewhat strange to me. I run a onstat -g tpf with the thread id and see the following: Thread profiles tid lkreqs lkw dl to lgrs isrd iswr isrw isdl isct isrb lx bfr bfw lsus lsmx seq 66 1630372676 34 0 0 7797 3381784 865 867 0 1732 0 0 521007501 3968 0 5992 79390 I guess my question is what do these headings mean and could this be the cause of my CPU problem. There are actually a couple of these threads on the system. Using other onstat commands I tracked them back to processes running on the unix machine. The unix processes themselves use very little CPU. Any other suggestions of things to look at would be appreciated. Thanks for taking the time to look at this.