I wonder if the -c parameter is truly submitting everything in parallel. Having 2 telnet sessions up -- 1 doing -c 1 and another doing -c 100 -- I don't see much different in the display speed messages. Perhaps it's an issue with the telnet console display limiting the command speed. I thought about piping the output to /dev/null but then the final TPS results are also piped there. I can try piping output to a file on a ramdisk maybe.



Mohan, Ross wrote:
I had a similar experience.
regardless of scaling, etc, I got same results. almost like flags
are not active.
did

pgbench -I template1
and
pgbench -c 10 -t 50 -v -d 1
and played around from there....

This is on IBM pSeries, AIX5.3, PG8.0.2

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of William Yu
Sent: Tuesday, June 21, 2005 12:05 PM
To: pgsql-performance@postgresql.org
Subject: [PERFORM] Trying to figure out pgbench


My Dual Core Opteron server came in last week. I tried to do some benchmarks with pgbench to get some numbers on the difference between 1x1 -> 2x1 -> 2x2 but no matter what I did, I kept getting the same TPS on all systems. Any hints on what the pgbench parameters I should be using?

In terms of production use, it definitely can handle more load. Previously, Apache/Perl had to run on a separate server to avoid a ~50% penalty. Now, the numbers are +15% performance even with Apache/Perl running on the same box as PostgreSQL. How much more load of course is what I'd like to quantify.

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