On 7/18/05, Tom Lane <[EMAIL PROTECTED]> wrote: > > The table has 15 columns, 5 indexes (character, inet and timestamp). > > No foreign keys. The only other thing running on the machine was the > > application actually DOING the benchmarking, written in Python > > (psycopg), but it was, according to top, using less than 1% of the > > CPU. It was just talking through a pipe to a psql prompt to do the > > COPY. > > Sounds pretty plain-vanilla all right. > > Are you in a position to try the same benchmark against CVS tip? > (The nightly snapshot tarball would be plenty close enough.) I'm > just wondering if the old bgwriter behavior of locking down the > bufmgr while it examined the ARC/2Q data structures is causing this...
Tom, It looks like the CVS HEAD is definately "better," but not by a huge amount. The only difference is I wasn't run autovacuum in the background (default settings), but I don't think this explains it. Here's a graph of the differences and density of behavior: http://blog.amber.org/diagrams/pgsql_copy_803_cvs.png I can provide the raw data. Each COPY was 500 rows. Note that fsync is turned off here. Maybe it'd be more stable with it turned on? Chris -- | Christopher Petrilli | [EMAIL PROTECTED] ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
