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Re: PATCH: pgbench - random sampling of transaction written into log

From: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
To: Tomas Vondra <tv(at)fuzzy(dot)cz>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: PATCH: pgbench - random sampling of transaction written into log
Date: 2012-10-03 12:49:31
Message-ID: 506C345B.8090900@vmware.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On 03.09.2012 01:40, Tomas Vondra wrote:
> So, here is a fixed version of the patch. I've made these changes:

Committed with some minor kibitzing.

> 1) The option is now '--sampling-rate' instead of '-R' and accepts float
> arguments. I've decided not to use 0.01 = 1% but use 1 = 1%, so it
> accepts values between 0 and 100. I find this more natural.

I find a fraction, ie. 0.01 = 1% more natural, so I changed it back to 
that. I realize this is bike-shedding, but I believe Robert also found 
this more natural, as that's what he suggested upthread.

I edited the comments and variable names a little bit, and also added a 
small paragraph to the pgbench user manual about this under 
"Per-Transaction Logging", in addition to the explanation under 
"Benchmarking Options"

- Heikki


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