Andreas Pflug wrote: > Bruce Momjian wrote: > > >>There seems to be a 'PostgreSQL ping' time of about 1-2 ms in best case > >>conditions which limits the amount of queries you can fire off in 1 > >>second, no matter how simple. In certain rare cases this is something > >>of a bottleneck. In my personal case it would be nice to see that time > >>lower because converted COBOL applications tend to generate a lot of > >>'simple' queries. > >> > >> > > > >Yes, most of that might be network time. I am using log_duration, which > >I think just tests backend time, not network transfer time, but I might > >be wrong. I want to look into this as it seems no one knows the answer. > > > > > > > That's easy to verify with standard ping. In my switched 100MBit > network, roundtrip for small packets is about 0.2 ms, and 0.5ms for 1kb > packets. How about context switch latency?
I am on a dual Xeon. I wouldn't think there was that much of a context switch overhead, except for kernel calls. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
