[asdf-devel] Performance hit in TRUENAMIZE

Juan Jose Garcia-Ripoll juanjose.garciaripoll at googlemail.com
Sun Jul 25 13:04:37 UTC 2010

On Sun, Jul 25, 2010 at 12:48 AM, Faré <fahree at gmail.com> wrote:

> I don't see what probe-file does that's different from (ignore-errors
> (truename ...)),

I explained it in the previous email. Determining whether a file exists has
a very very small cost, just a call to fstat() or whatever equivalent
function the Common Lisp provides. Say this has a cost 1. This is followed
by a call to TRUENAME which has a cost N, proportional to the length of
components in the directory part of the pathname, but this cost only applies
when the file exists. This is relevant for ASDF because 80% of the calls to
TRUENAME may happen with non-existent paths.

Can you test/review the following patch based on yours? I intend to
> make it into ASDF 2.112.

Seems to work just fine.


Instituto de Física Fundamental, CSIC
c/ Serrano, 113b, Madrid 28006 (Spain)
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