| From: | Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> |
|---|---|
| To: | tgl(at)sss(dot)pgh(dot)pa(dot)us |
| Cc: | pgman(at)candle(dot)pha(dot)pa(dot)us, phede-ml(at)islande(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Unicode combining characters |
| Date: | 2001-10-03 01:01:22 |
| Message-ID: | 20011003100122S.t-ishii@sra.co.jp |
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| Lists: | pgsql-hackers |
> Yeah, I suspect there's 10% or more noise in these numbers. But then
> one could read the results as saying we can't reliably measure any
> difference at all ...
>
> I'd feel more confident if the measurements were done using operators
> repeated enough times to yield multiple-second runtimes. I don't
> trust fractional-second time measurements on Unix boxen; too much chance
> of bogus results due to activity of other processes.
Any idea to do that? I tried to do a measurements using something like
"SELECT * FROM t1 WHERE very-long-string-column LIKE 'aaa'", but I'm
afraid the I/O time masks the difference...
--
Tatsuo Ishii
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