Re: GC brokenness in `master'

[Neil Jerram]

address@hidden (Ludovic Courtès) writes:

> Hello,
>
> address@hidden (Ludovic Courtès) writes:
>
>>     ("subr.bm: subr invocation: simple subr" 700000 total 0.98)
>>     ("subr.bm: subr invocation: generic subr" 700000 total 1.39)
>>     ("subr.bm: subr invocation: generic subr with rest arg" 700000 total 
>> 1.32)
>>     ("subr.bm: subr invocation: generic subr with rest arg and 3+ 
>> parameters" 700000 total 1.63)
>
> "Interestingly", this is roughly twice as slow as 1.8 (!).
>
> After some manual bisecting, I found the offending commit (dated
> 2008-08-16):
>
>   
> http://git.savannah.gnu.org/cgit/guile.git/commit/?id=82ae1b8eb3413e6be6bd2aa032986fc7782e85ac

But presumably this doesn't matter much, if we are going to switch to
BDW-GC.  What's your latest thinking on that?

> Strangely enough, the "simple subr" case, which is not GC-intensive, is
> slower with BDW-GC.  This needs further investigation...

It's not very much slower - and IMO, not serious enough to be a
significant factor against BDW-GC.

But it's nicer to understand things fully, so I agree that
investigation would be good too.

       Neil