| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pgbench randomness initialization |
| Date: | 2016-04-07 15:51:32 |
| Message-ID: | 20160407155132.GA494251@alvherre.pgsql |
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| Thread: | |
| Lists: | pgsql-hackers |
Fabien COELHO wrote:
> While testing it I had a funny pattern, something like:
>
> pgbench --random-seed=123 -M prepared -T 3 -P 1 -S
> 1.0: 600 tps
> 2.0: 600 tps
> 3.0: 600 tps
The output should include the random seed used, whether it was passed
with --random-seed, environment variable or randomly determined. That
way, the user that later wants to verify why a particular run caused
some particular misbehavior knows what seed to use to reproduce that
run.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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