Re: Could synchronous streaming replication really degrade the performance of the primary? - Mailing list pgsql-performance

From Thomas Kellerer
Subject Re: Could synchronous streaming replication really degrade the performance of the primary?
Date
Msg-id jogb57$3dg$1@dough.gmane.org
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In response to Re: Could synchronous streaming replication really degrade the performance of the primary?  ("MauMau" <maumau307@gmail.com>)
List 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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