From amartinez@mindspring.com Fri May 19 08:26:07 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!amartinez
From: amartinez@mindspring.com (Anton Martínez)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May19.082607.2672@mindspring.com>
Date: Fri, 19 May 1995 08:26:07 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.
Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector.

-- 
Anton Martínez
Tape trading list upon request. SASE required for international mail.

From itanaka@utexas.edu Sat May 20 14:11:07 1995
Path: ashpoly!cascade!brgate!saturno!utexas!itanaka
From: itanaka@utexas.edu (Ines Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May20.141107.8059@utexas.edu>
Date: Sat, 20 May 1995 14:11:07 GMT
References: <1995May19.082607.2672@mindspring.com>
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In article <1995May19.082607.2672@mindspring.com>, amartinez@mindspring.com (Anton Martínez) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field.

-- 
=== Ines Tanaka ===
Dept of Electrical Engineering, University of Texas at Austin
"Marcus is not one man."

From smuller@illinois.edu Sun May 21 14:04:07 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!smuller
From: smuller@illinois.edu (Seo-yeon Müller)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May21.140407.9078@illinois.edu>
Date: Sun, 21 May 1995 14:04:07 GMT
References: <1995May19.082607.2672@mindspring.com> <1995May20.141107.8059@utexas.edu>
Organization: University of Illinois Urbana-Champaign
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In article <1995May20.141107.8059@utexas.edu>, itanaka@utexas.edu (Ines Tanaka) writes:
> Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field.

Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

-- 
Seo-yeon Müller | smuller@illinois.edu
PGP Key fingerprint: 019C AF58 9363 394C
"Keep the channels open."

From gmoreno@uni-hamburg.de Mon May 22 05:10:07 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!gmoreno
From: gmoreno@uni-hamburg.de (Graham Moreno)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May22.051007.4201@uni-hamburg.de>
Date: Mon, 22 May 1995 05:10:07 GMT
References: <1995May19.082607.2672@mindspring.com>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1995May19.082607.2672@mindspring.com>, amartinez@mindspring.com (Anton Martínez) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

-- 
Graham Moreno
Tape trading list upon request. SASE required for international mail.