Hi Han-Wen, Han-Wen Nienhuys <[EMAIL PROTECTED]> writes:
> Ludovic Courtès schreef: >> >> But please, relax about performance, we still haven't run any meaningful >> benchmark. ;-) > > btw, is there any news on this patch? I'm quite keen on dumping > LilyPond's Rational class in favor of Scheme rationals, but adding gc > mark functions for that is just too much work; BGC would be a nice > soluiton to this. Well, no real news. My "not-so-meaningful benchmarks" (running a loop[*]) reproductively show that "GBGC" is noticeably slower than "real Guile" (1.5 to 2 times slower). This could be due to various reasons. * It could be that too much memory is being retained and subsequently scanned. That's what I initially thought but after looking for this kind of error for some time, I'm not so convinced that this is the case. * Initially, a fair amount of pointer-less memory (e.g., file or string contents) ended up being scanned. I fixed this at some point, and now I don't think there's any such error left. * The GC settings should be tweaked. For instance, increasing BGC's initial heap size (e.g., via the `GC_INITIAL_HEAP_SIZE' environment variable) yields a noticeable improvement (though not sufficient). * Any other reason listed (or not listed ;-)) at http://www.hpl.hp.com/personal/Hans_Boehm/gc/debugging.html . At this point, I'm a bit clueless not (yet) completely hopeless. ;-) That is, I think it'd be worth keeping investigating this, but I'm definitely looking for people with a fresh view on the topic to help! :-) I recently merged in changes from HEAD in my BGC branch. If you want to give it a try and if you want to help, you can fetch it this way: $ tla register-archive http://www.laas.fr/~lcourtes/software/arch-2005/ $ tla get [EMAIL PROTECTED]/guile-core--boehm-gc--1.9 Thanks, Ludovic. [*] It turns out that even tail-recursive call trigger memory allocation, via `SCM_EXTEND_ENV ()'. _______________________________________________ Guile-devel mailing list Guile-devel@gnu.org http://lists.gnu.org/mailman/listinfo/guile-devel
