Στις Tuesday 08 July 2008 17:35:16 ο/η Tom Lane έγραψε: > Achilleas Mantzios <achill@xxxxxxxxxxxxxxxxxxxxx> writes: > > In this case, the INSERT *needs* 20 minutes to return. This is because the logging through syslog seems to severely slow the system. > > If instead, i use stderr, even with logging_collector=on, the same statement needs 15 seconds to return. > > Hmm. There's a function in elog.c that breaks log messages into chunks > for syslog. I don't think anyone's ever looked hard at its performance > --- maybe there's an O(N^2) behavior? > > regards, tom lane > Thanx, i changed PG_SYSLOG_LIMIT in elog.c:1269 from 128 to 1048576 #ifndef PG_SYSLOG_LIMIT /* #define PG_SYSLOG_LIMIT 128 */ #define PG_SYSLOG_LIMIT 1048576 #endif and i got super fast stderr performance. :) However, i noticed a certain amount of data in the log is lost. Didnt dig much to the details tho. -- Achilleas Mantzios
