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massive speedup on temp table creation/destruction?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-hackers(at)postgreSQL(dot)org
Subject: massive speedup on temp table creation/destruction?
Date: 2006-09-01 01:06:38
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
I was just trying (unsuccessfully so far) to replicate Csaba Nagy's
report of a strange failure with temp table creation.  I made use
of pgbench's recent improvements to be able to push random scripts
at a collection of backends:

$ cat ttscript.sql
create temp table foo (f1 int);
drop table foo;
$ pgbench -n -c 98 -t 1000 -f ttscript.sql bench

This is just pushing a long string of create temp table/drop table
commands at a whole lot of backends concurrently.

What I found surprising is that I get numbers like 430 tps from HEAD
and 220 tps from REL8_1_STABLE.  This test case is of course not about
performance, but I'm not quite sure what we changed that would produce
a 2X speedup from 8.1.  Can anyone else replicate this?

			regards, tom lane


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