Re: SHA256 performance with Guile 2.2 vs. Guile 3.0

[Nala Ginrut <nalaginrut@gmail.com>]

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Congrats!
I just replaced Weinholt's hmac implementation with NSS binding for product
consideration, but nice to know this great result! And thanks to Weinholt's
work, Artanis had been relying on it for many years.

Best regards.


On Sat, Jan 4, 2020, 18:36 Göran Weinholt <goran@weinholt.se> wrote:

> Ludovic Courtès <ludo@gnu.org> writes:
>
> > Ludovic Courtès <ludo@gnu.org> skribis:
> >
> >> ludo@ribbon ~/src/guix$ ./pre-inst-env guix environment --pure
> --ad-hoc guile-next guile3.0-hashing -- guile ~/tmp/sha256.scm
> >>
> >> ;;; (hash
> "b33576331465a60b003573541bf3b1c205936a16c407bc69f8419a527bf5c988")
> >> clock utime stime cutime cstime gctime
> >> 65.17 89.75  0.45   0.00   0.00  35.63
> >
> > The patch below gives us:
> >
> > ludo@ribbon /tmp/hashing$ guile --r6rs -L .. ~/tmp/sha256.scm
> >
> > ;;; (hash
> "b33576331465a60b003573541bf3b1c205936a16c407bc69f8419a527bf5c988")
> > clock utime stime cutime cstime gctime
> > 59.31 80.65  0.39   0.00   0.00  30.73
> >
> > It’s a disappointingly small improvement.  The reason is that (hashing
> > fixnums) adds another layer of opacity, where it ends up doing
> > essentially:
> >
> >   (define fx32xor fxxor)
> >   …
> >
> > Thus, no inlining, and no easy trick to solve that.  :-/
>
> I've pushed a Guile-specific version of (hashing fixnums) that inlines
> the generic arithmetic procedures. This and some other small changes
> improved the runtime:
>
>            clock utime stime cutime cstime gctime
>  before:
>     2.2.6  31.06 32.61  0.03   0.00   0.00   1.38
>     2.9.8  15.55 16.23  0.01   0.00   0.00   1.19
>  after:
>     2.2.6   2.95  3.01  0.00   0.00   0.00   0.10
>     2.9.8   1.98  1.99  0.00   0.00   0.00   0.08
>
> That's about 100 times slower than sha256sum from coreutils. You might
> get some more performance out of it by unrolling the loop in
> sha-256-transform!.
>
> Regards,
>
> --
> Göran Weinholt   | https://weinholt.se/
> Debian developer | 73 de SA6CJK
>
>

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