Tom Lane writes: > Since pg_hba.conf is re-read on every connection, I've always thought > it was pretty bogus to bulk it up with that much internal documentation. > I've not tried to measure how much time it takes the postmaster to skip > over those 200 comment lines, but it can't be completely negligible. I've run a simplistic test for this. I've let psql start 10000 times sequentially and timed the backend startup. All times are wall clock (gettimeofday). The first checkpoint is after the accept(), the second before the backend loop begins. The machine had a load average of 1.00 to 1.50 and wasn't running anything else besides "infrastructure". default pg_hba.conf count | min | max | avg | stddev -------+----------+----------+--------------+--------------------- 10000 | 0.024667 | 0.060208 | 0.0298723081 | 0.00746411804719077 pg_hba.conf, all comments removed count | min | max | avg | stddev -------+----------+---------+--------------------+--------------------- 10000 | 0.022364 | 0.05946 | 0.0262477744000001 | 0.00570493964559965 So we're looking at a possible 12% win. I suggest we remove the comments and direct the user to the Admin Guide. Btw., in case someone wants to go optimizing, more than 75% of the backend startup time is spent in InitPostgres(): count | min | max | avg | stddev -------+---------+----------+--------------+--------------------- 10000 | 0.01953 | 0.368216 | 0.0222271679 | 0.00629838985852663 -- Peter Eisentraut [EMAIL PROTECTED] http://funkturm.homeip.net/~peter ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
