They are quite different hardware.
How long does it take for the _first_ time you do the query on the Celeron machine? The first time. Wait until everything has started up first and the machine is quiescent.
How long does it take for the _second_ and _third_ times?
Do the same for all the machines.
Are the drives on the machine very different?
How about you analyze the disks on each machine and compare how fragmented the database files are on the various machines?
128MB RAM is not very much for a Win2K machine. Not very far from swapping.
Win2K pro or Win2K server? Performance optimized for server or desktop/applications?
Regards, Link.
At 02:57 AM 3/23/2005 -0700, A. Mous wrote:
Hi,
I have a table with about 1500 records. My query is very basic: SELECT * FROM foo;
With postgres 8.0.1 on Win XP (Celeron 2400, 500MB RAM) it returns the results in about 80ms. The same query on the same database, tested on three different win2k machines all running 8.0.1, takes roughly 4 seconds. Win2K machines are as follows:
1) PIII 800, 256MB RAM 2) Celeron 400, 128MB RAM 3) PII 233, 128MB RAM
All machines are currently using the default settings upon install. I've tried adjusting shared_buffers and work_mem but nothing seems to make any difference.
EXPLAIN ANALYZE on WinXP machine gives:
Seq Scan on foo (cost=0.00..65.71 rows=1471 width=95) (actual time=0.000..0.000 rows=1472 loops=1)
Same on #3 Win2K machine gives:
Seq Scan on foo (cost=0.00..40.72 rows=1472 width=95) (actual time=0.000..80.000 rows=1472 loops=1)
All queries are executed locally on the server. Can anyone please explain the profound performance difference here (which appear to be related to the OS)?
Much thanks in advance!
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