Re: [Jscheme-devel] jscheme/prims.scm update

[Ken A. <kan...@bb...>]

Yes, using generics which are built on reflection is about 3 times slower.
However, it is a good way to bootstrap a simple Scheme.  Maybe we could take your primitives and generate Primitives.java from it.

Can you check in the Gabriel benchmarks so we can use them as a performance test?

BTW, Henry Baker showed that some of the benchmarks can be rewritten so they become so fast they no longer become useful benchmarks.
http://home.pipeline.com/~hbaker1/home.html

At 09:37 AM 5/27/2004 -0400, Timothy John Hickey wrote:
>Report on direct implementation of primitives in javadot...
>
>The jscheme/prims.scm approach still has a way to go before it is competitive with
>our current approach. I ran the gabriel benchmarks on standard JScheme
>(on a 1 GHZ PowerPC G4 Mac OSX 10.3.4)
>and then ran it again after loading in jscheme/prims.scm
>
>It appears that the pure javadot implementation is about 3-5 times slower
>(and there are still a few bugs! which cause FFT, Fprint and Fread not to work,
>I'll isolate them and put them in jscheme/SchemeTests.scm...)
>
>
>                          CPSTAK CTAK      Dderiv  Deriv  Destructive Div-iter   Div-rec
>Mac G4/std        1839      26520      2682     1833     5407       
>1834       1887
>Mac G4/prims    8162   134623    21427   22026  39038       5885       
>5701
>
>                                FFT    Fprint    Fread   Puzzle  TAK    
> TAKL    TAKR
>Mac G4/std          10712  116         480     241     1072      8584   
>1162
>Mac G4/prims      FAIL    FAIL        FAIL    650     6946    27842   
>7381
>
>Using the javadot notation seems to double the time for standard primitives (note (car x) is defined by x.first() in primitives.scm)
>> (define L '(a b c d e f g))
>> (time (car L) 100000)    ---> (a (422 msec) (357280 bytes))
>> (time (.first$ L) 100000)---> (a (869 msec) (357280 bytes))
>
>also adding a lambda layer makes the time triple that of the regular primitive
>> (define (mycar L) (.first$ L))   ---> (lambda mycar (L)...)
>> (time (mycar L) 100000) ---> (a (1207 msec) (163008 bytes))
>
>This provides an automatic slowdown of about 3.
>Compilation could remove most of this slowdown if done well.
>
>---Tim---
>
>
>
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