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Re: [Chicken-users] numbers egg slow?
From: |
Daishi Kato |
Subject: |
Re: [Chicken-users] numbers egg slow? |
Date: |
Thu, 06 Oct 2005 14:50:18 +0900 |
User-agent: |
Wanderlust/2.15.1 (Almost Unreal) Emacs/21.4 Mule/5.0 (SAKAKI) |
At Mon, 3 Oct 2005 20:40:00 +0200,
felix winkelmann wrote:
> Using numbers is definitely slower, since there is more dispatching
> overhead on number types. The base system only has two numeric
> types, which makes a type-check quite fast. The numbers egg has
> to check for more possible types (and all these tests are implemented
> in Scheme).
That is certainly understandable, except that I do not know if
type-checking in scheme code is really slower than type-cheking
in c code, if the scheme code is compiled properly or unsafely. (or inlined?)
# Basically, there should not be any overhead from the code
# IF fixnum? THEN do_fixnum_plus ELSE do_flonum_plus
# to the code
# IF fixnum? THEN do_fixnum_plus ELSE IF flonum? do_flonum_plus
# ELSE IF bignum? do_bignum_plus ELSE IF ratnum? do_ratnum_plus
# ELSE do_compnum_plus
# ,when doing plus on fixnums.
# Is it true?
I also tried to compare with fx+. How would you explain this?
% csi -eval '(print (cpu-time))(let loop ([i 0]) (or (> i (expt 2 17)) (loop
(fx+ i 1))))(print (cpu-time))'
2
107
% csi -eval '(use numbers)(print (cpu-time))(let loop ([i 0]) (or (> i (expt 2
17)) (loop (fx+ i 1))))(print (cpu-time))'
3
992
Daishi
- Re: [Chicken-users] numbers egg slow?, felix winkelmann, 2005/10/03
- Re: [Chicken-users] numbers egg slow?,
Daishi Kato <=
- Re: [Chicken-users] numbers egg slow?, Alex Shinn, 2005/10/06
- Re: [Chicken-users] numbers egg slow?, Daishi Kato, 2005/10/06
- Re: [Chicken-users] numbers egg slow?, Daishi Kato, 2005/10/06
- Re: [Chicken-users] numbers egg slow?, Alex Shinn, 2005/10/07
- Re: [Chicken-users] numbers egg slow?, Daishi Kato, 2005/10/12
- Re: [Chicken-users] numbers egg slow?, Daishi Kato, 2005/10/12
- Re: [Chicken-users] numbers egg slow?, Alex Shinn, 2005/10/13