| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Greg Smith <gsmith(at)gregsmith(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: pgbench duration option |
| Date: | 2008-08-18 22:11:36 |
| Message-ID: | 20080818221136.GE4454@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Greg Smith wrote:
> On Mon, 18 Aug 2008, Tom Lane wrote:
>> I repeat my concern that transaction rates measured with this patch will
>> be significantly different from those seen with the old code
>
> Last time I tried to quantify the overhead of logging with timestamps on
> I couldn't even measure its impact, it was lower than the usual pgbench
> noise.
There's a hardware deficiency on certain machines -- I think it's old
ones. I don't know if machines that would currently be used in
production would contain such a problem.
In any case, I think using SIGALRM as proposed by Tom is a very easy way
out of the problem.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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