Hi, On 2022-04-08 17:04:34 +0200, Alvaro Herrera wrote: > > Since dash won't help us to get the build time down sufficiently, and the > > tests don't pass without a separate build tree, I looked at what makes > > config/prep_buildtree so slow. > > Maybe we can replace prep_buildtree with a Perl script. Surely that > should be faster.
Currently building doesn't depend on perl :( I think the improvements that I suggested are big enough that they're worth doing on their own, particularly for windows, but also other OSs. I just realized that the second find is pretty expensive compared to the first. time find "$sourcetree" -type d \( \( -name CVS -prune \) -o \( -name .git -prune \) -o -print \) | grep -v "$sourcetree/doc/src/sgml/\+" > /dev/null real 0m0.019s user 0m0.008s sys 0m0.017s second: time find "$sourcetree" -name Makefile -print -o -name GNUmakefile -print | grep -v "$sourcetree/doc/src/sgml/images/" > /dev/null real 0m0.118s user 0m0.071s sys 0m0.053s It think we could just obsolete the second find, by checking for the existence of Makefile / GNUmakefile in the first loop... The invocation of ln -s is quite measurable - looks like it's mostly the process startup overhead (on linux, at least). Doing a ln --version > /dev/null each iteration takes about the same time as actually creating the symlinks. Greetings, Andres Freund
