how much cpu does Informix use

IDS10 on AIX 5.3. Sorry if this has been asked before, but I still don't have a satisfactory answer. We are trying to determine exactly how much percentage of our system cpu, that Informix is using through time. This is proving to be a difficult task, because sar doesn't provide process names or id's so that I can correlate a percentage to 'oninit'. ps command doesn't provide percentage. I am thinking that at least I can use onstat -g glo, add up all of the total time for cpu vps ( because I think those are the metrics of what oninit does on the physical cpus ). First question: Am I correct that only the cpuvps are directly tied to the physical cpus?  Or do I need to be counting all of the vps ? Second question. The numbers provided for each cpu is what ? Seconds ? So, assuming that oninit has been up the entire time that the lpar has been up, if I divide the total time from onstat -g glo by the number of seconds since the lpar has been up, will that tell me the percentage of cpu that oninit uses ? Thanks for any advice on this. Floyd