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Re: Could synchronous streaming replication really degrade the performance of the primary?

From: Thomas Kellerer <spam_eater(at)gmx(dot)net>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Could synchronous streaming replication really degrade the performance of the primary?
Date: 2012-05-10 12:10:48
Message-ID: jogb57$3dg$1@dough.gmane.org (view raw or flat)
Thread:
Lists: pgsql-performance
MauMau, 10.05.2012 13:34:
> Today, they told me that they ran the test on two virtual machines on
> a single physical machine.

Which means that both databases shared the same I/O system (harddisks).
Thererfor it's not really surprising that the overall performance goes down if you increase the I/O load.

A more realistic test (at least in my opinion) would have been to have two separate computers with two separate I/O systems




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