Re: Question of performance of version 8

kondo_yo@itg.hitachi.co.jp writes:
> I tried performance test of version 8.0.0 beta4 by osdl-dbt-1.
> The result is that throughput of version 8 fell to about 70 percent
> compared with V7.4.6.

beta4 is a little bit back ...

I don't have dbt1 at hand, but I tried pg_bench on PG 7.4.6 against 8.0rc2
just now.  For the test case

    pgbench -i -s 10 bench
    pgbench -c 10 -t 10000 bench

on 7.4.6 I get:

starting vacuum...end.
transaction type: TPC-B (sort of)
scaling factor: 10
number of clients: 10
number of transactions per client: 10000
number of transactions actually processed: 100000/100000
tps = 65.714249 (including connections establishing)
tps = 65.716363 (excluding connections establishing)

on 8.0rc2 I get:

starting vacuum...end.
transaction type: TPC-B (sort of)
scaling factor: 10
number of clients: 10
number of transactions per client: 10000
number of transactions actually processed: 100000/100000
tps = 107.379742 (including connections establishing)
tps = 107.385301 (excluding connections establishing)

This is on a Fedora Core 3 machine, generic three-year-old PC with cheap
junk IDE drive that lies about write completion (but I'm running fsync
off so that hardly matters ;-)).  And I didn't change any of the default
postgresql.conf settings, just started the postmaster with -F in both
cases.  So I wouldn't claim that it's very representative of real-world
performance on real-world server hardware.  But I'm not seeing a serious
falloff from 7.4 to 8.0 here --- more the other way 'round.

Please try dbt1 with 8.0rc2, and let us know if you still see a problem.

            regards, tom lane