"Tom Lane" <[EMAIL PROTECTED]> writes: > Gregory Stark <[EMAIL PROTECTED]> writes: >> You would have to test for whether it's time to sleep much more often. >> Possibly before every ExecProcNode call would be enough. > > That would have overhead comparable to EXPLAIN ANALYZE, which is a lot.
I don't think the overhead would be anywhere near as much. He wouldn't have to call gettimeofday() (except just after sleeping) which is what hurts EXPLAIN ANLAYZE so much. Just count i/o operations. In any case, if the point is to call sleep how much would do we care about overhead? Do you think it would consume so much extra cpu that even after sleeping for 10ms it would be a big resource drain for other processes? The point about the invasiveness remains. If you want to count i/o operations it means touching a lot of lower-level code. I'm interested in doing that anyways to get better monitoring and profiling data though. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL training! -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
