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Re: testing HS/SR - 1 vs 2 performance

From: "Erik Rijkers" <er(at)xs4all(dot)nl>
To: "Simon Riggs" <simon(at)2ndQuadrant(dot)com>
Cc: "Robert Haas" <robertmhaas(at)gmail(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Heikki Linnakangas" <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: testing HS/SR - 1 vs 2 performance
Date: 2010-05-04 16:33:26
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Lists: pgsql-hackers
On Tue, May 4, 2010 18:19, Simon Riggs wrote:
> On Tue, 2010-05-04 at 18:10 +0200, Erik Rijkers wrote:
>> It would be interesting if anyone repeated these simple tests and
>> produced evidence that these non-HS.
>> (Unfortunately, I have at the moment not much time for more testing)
> Would you be able to make those systems available for further testing?

No. sorry.

> First, I'd perform the same test with the systems swapped, so we know
> more about the symmetry of the issue. After that, would like to look
> more into internals.

you mean "systems swapped", primary and standby?  primary and standby were on the same machine in
these tests (even the same raid).

I can eventually move the standby (the 'slow' side, as it stands) to another, quite similar
machine.  Not in the coming days though...

> Is it possible to setup SytemTap and dtrace on these systems?

I did install systemtap last week. dtrace is not installed (I think. I've never used either.)

Erik Rijkers

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