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From: ludo@gnu.org (Ludovic Courtès)
To: Luca Saiu <positron@gnu.org>
Cc: bug-guile@gnu.org
Subject: Re: High run time variance
Date: Tue, 30 Mar 2010 11:16:05 +0200	[thread overview]
Message-ID: <87vdce186i.fsf@gnu.org> (raw)
In-Reply-To: <4BB0D0A7.7080505@gnu.org> (Luca Saiu's message of "Mon, 29 Mar 2010 18:09:11 +0200")

Hi Luca,

Luca Saiu <positron@gnu.org> writes:

> (define (fibo n)
>   (if (< n 2)
>       n
>       (+ (fibo (- n 1))
>          (fibo (- n 2)))))

This function is not tail-recursive, so it consumes stack space, which
increases the amount of memory the GC has to scan.  My guess is that
this has to do with the time spent in GC.

Could you try with a tail-recursive version?

Thanks,
Ludo’.




  reply	other threads:[~2010-03-30  9:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-29 16:09 High run time variance Luca Saiu
2010-03-30  9:16 ` Ludovic Courtès [this message]
2010-03-30 12:35   ` Luca Saiu
2010-03-30 13:01     ` Ludovic Courtès
2010-03-30 15:05       ` Luca Saiu
2010-08-04 19:51 ` Andy Wingo
2010-08-05 13:42   ` Luca Saiu
2010-08-05 14:45     ` Andy Wingo
2010-08-05 16:21       ` Luca Saiu
2010-08-05 17:43         ` Andy Wingo

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