| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>, PGSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Improving prep_buildtree used in VPATH builds |
| Date: | 2010-09-27 17:21:39 |
| Message-ID: | 16529.1285608099@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> Excerpts from Gurjeet Singh's message of dom sep 26 22:15:59 -0400 2010:
>> Currently I am seeing a performance improvement of this script by only about
>> 500 ms; say 11.8 seconds vs. 11.3 secs. But I remember distinctly that
>> yesterday I was able to see an improvement of 11% on the same virtual
>> machine, averaged on multiple runs; 42 sec vs 37 sec. It might be the case
>> that the host OS or my Linux virtual machine were loaded at that time and
>> the filesystem could not cache enough inodes.
> Hmm. On my otherwise idle desktop machine, I can't measure a difference.
Yeah, this seems like something that would have at best an
environment-specific effect. I'm not convinced that it couldn't make
things worse in some cases ...
regards, tom lane
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