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Re: Performance over a LAN

From: "Scott Marlowe" <smarlowe(at)qwest(dot)net>
To: "William Carney" <wcarney(at)sa(dot)quiktrak(dot)com(dot)au>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Performance over a LAN
Date: 2004-07-23 06:29:11
Message-ID: 1090564151.709.59.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, 2004-07-22 at 23:50, William Carney wrote:
> Hello,
> 
> Using a test client application that performs 100000 insert operations on a
> table, with the client application running on the same machine as the
> Postgres server, I get the following results for the time taken to run the
> test:
> 
> Unix domain socket connection: 26 seconds
> Inet domain socket ('localhost'): 35 seconds
> 
> The table has two columns, a timestamp and a character(16), no indexes.
> 
> But with the server running on one machine and the client running on
> another, the two machines being connected by a 100 Mb ethernet, with nothing
> else on the network, this test takes 17 minutes to run. I have tried
> changing the frequency of COMMIT operations, but with only a small effect.
> 
> The machines used are P4s running FreeBSD 5.2.1. The Postgres version is
> 7.4.3. Can anyone tell me why there's such a big difference?

Are you using the exact same script locally as across the network?

Have you checked to see how fast you can copy just a plain text file
across the network connection?

Have you checked your system to see if you're getting lots of network
errors or anything like that?


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