I have a 9.2 server that occasionally becomes CPU bound. Disk wait is nominal and there's no memory pressure. The workload is almost all reads and the cache hit rate is high.
Do you see higher user time, or high system time? What is the maximum number of concurrent connections you have?
For some one minute periods, my monitoring shows around 1.5k to 2k access share locks out of a total of 7.5 to 8k transactions. What's the best strategy for finding out if that is creating a bottleneck?
How are you monitoring? What do those numbers mean, that you took that many access shared locks, or you held that many simultaneously at the peak, or that you blocked on them that many times?