Re: Improving prep_buildtree used in VPATH builds

On Mon, Sep 27, 2010 at 7:21 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> 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 ...
>

I can't think of any obvious cases where this might hurt. I am unable to
reproduce the 11% improvement, but I did see that dramatic change which
prompted me for the patch. On the contrary, nothing so far suggests that it
could hurt configure times.

Regards,
--
gurjeet.singh
@ EnterpriseDB - The Enterprise Postgres Company
http://www.EnterpriseDB.com

singh(dot)gurjeet(at){ gmail | yahoo }.com
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