Re: Improving prep_buildtree used in VPATH builds

Alvaro Herrera <alvherre@commandprompt.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