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Re: Commit slower on faster PC

From: Bruno Wolff III <bruno(at)wolff(dot)to>
To: "Koth, Christian \(DWBI\)" <Christian(dot)Koth(at)smiths-heimann(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Commit slower on faster PC
Date: 2006-07-12 19:25:39
Message-ID: 20060712192539.GD29575@wolff.to (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, Jul 12, 2006 at 10:16:40 -0600,
  "Koth, Christian (DWBI)" <Christian(dot)Koth(at)smiths-heimann(dot)com> wrote:
> 
> I have noticed a strange performance behaviour using a commit statement on two different machines. On one of the machines the commit is many times faster than on the other machine which has faster hardware. Server and client are running always on the same machine.
> 
> Server version (same on both machines): PostgreSQL 8.1.3. (same binaries as well)
> 
> PC1:
> ----
> IDE-HDD (approx. 50 MB/s rw), fs: ext3
> 
> PC2:
> ----
> SCSI-HDD (approx. 65 MB/s rw), fs: ext3
> 
> Both installations of the database have the same configuration, different from default are only the following settings on both machines:
> 
> pgbench gives me the following results:
> PC1:
> ----
> tps = 293.625393 (excluding connections establishing)
> 
> PC2:
> ----
> tps = 46.519634 (excluding connections establishing)

Have you checked to see if the ide drive is lying about having written the
data to the platters?

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