From: | Greg Smith <gsmith(at)gregsmith(dot)com> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: New to PostgreSQL, performance considerations |
Date: | 2006-12-12 16:36:01 |
Message-ID: | Pine.GSO.4.64.0612121123280.7466@westnet.com |
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Lists: | pgsql-performance |
On Tue, 12 Dec 2006, Alvaro Herrera wrote:
> While skimming over the pgbench source it has looked to me like it's
> necessary to pass the -s switch (scale factor) to both the
> initialization (-i) and the subsequent (non -i) runs.
For non-custom runs, it's computed based on the number of branches.
Around line 1415 you should find:
res = PQexec(con, "select count(*) from branches");
...
scale = atoi(PQgetvalue(res, 0, 0));
So it shouldn't be required during the run, just the initialization.
However, note that there were some recent bug fixes to the scaling
implementation, and I would recommend using the version that comes with
8.2 (pgbench 1.58 2006/10/21). It may compile fine even if you copy that
pgbench.c into an older version's contrib directory; it's certainly a
drop-in replacement (and improvement) for the pgbench 1.45 that comes with
current Postgres 8.1 versions.
--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD
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