Tatsuo Ishii <ishii@xxxxxxxxxxxx> writes: > Interesting. We (some Japanese companies including SRA OSS, > Inc. Japan) did some PG scalability testing using a Unisys's big 16 > (physical) CPU machine and found PG scales up to 8 CPUs. However > beyond 8 CPU PG does not scale anymore. The result can be viewed at > "OSS iPedia" web site (http://ossipedia.ipa.go.jp). Our conclusion was > PG has a serious lock contention problem in the environment by > analyzing the oprofile result. 18% in s_lock is definitely bad :-(. Were you able to determine which LWLock(s) are accounting for the contention? The test case seems to be spending a remarkable amount of time in LIKE comparisons, too. That probably is not a representative condition. regards, tom lane
