Re: guile performance - Ackermann function: way slower than emacs, slower still if compiled

[Andy Wingo]

Hi Ken,

Replying a lot :)

On Tue 04 Aug 2009 11:28, Ken Raeburn <address@hidden> writes:

> % time guile -c '(begin (load-compiled "ack.go") (ackermann 3 9))'
> 48.728u 22.016s 1:10.75 99.9% 0+0k 0+0io 0pf+0w
> %
>
> Not much better than loading the .scm file, and only better for small
> values of n... in fact, with m=3 and n>=6 the performance seems worse
> in the precompiled case:

I ran this under kcachegrind and it seems that the penalty is leaving
the VM for dispatching to `catch'. This is related to Daniel's issues
leaving the VM for dynamic-wind. So it seems that's what I should work
on.

There are a number of other little issues, but this is the big one.

Andy
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