From mokonkwo@earthlink.net Fri Aug 12 00:17:58 1994
Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!mokonkwo
From: mokonkwo@earthlink.net (Mateo Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Aug12.001758.8348@earthlink.net>
Date: Fri, 12 Aug 1994 00:17:58 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.

-- 
Mateo Okonkwo
Opinions expressed are solely my own and not those of EarthLink Network.
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From oweber@cam.ac.uk Sat Aug 13 06:13:58 1994
Path: ashpoly!cascade!mxgate!coyoacan!cam!oweber
From: oweber@cam.ac.uk (Olga Weber)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Aug13.061358.1411@cam.ac.uk>
Date: Sat, 13 Aug 1994 06:13:58 GMT
References: <1994Aug12.001758.8348@earthlink.net>
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In article <1994Aug12.001758.8348@earthlink.net>, mokonkwo@earthlink.net (Mateo Okonkwo) 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.

-- 
Olga Weber
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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From rkang@hanse.de Sat Aug 13 20:12:58 1994
Path: ashpoly!cascade!brgate!saturno!hanse!rkang
From: rkang@hanse.de (Rodrigo Kang)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Aug13.201258.7342@hanse.de>
Date: Sat, 13 Aug 1994 20:12:58 GMT
References: <1994Aug12.001758.8348@earthlink.net> <1994Aug13.061358.1411@cam.ac.uk>
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In article <1994Aug13.061358.1411@cam.ac.uk>, oweber@cam.ac.uk (Olga Weber) writes:
> Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Rodrigo Kang | rkang@hanse.de
PGP Key fingerprint: 12A7 C3EC 6422 ADC8
"Keep the channels open."