From mkarlsson@purdue.edu Fri Jul 01 06:45:11 1994
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From: mkarlsson@purdue.edu (Marta Karlsson)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jul01.064511.3746@purdue.edu>
Date: Fri, 01 Jul 1994 06:45:11 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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.

Make sure you install the 32-bit Enabler on older IIci machines running System 7.1!

-- 
Marta Karlsson
Tape trading list upon request. SASE required for international mail.

From gsokolov@tum.de Sat Jul 02 04:32:11 1994
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From: gsokolov@tum.de (Graham Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jul02.043211.2336@tum.de>
Date: Sat, 02 Jul 1994 04:32:11 GMT
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In article <1994Jul01.064511.3746@purdue.edu>, mkarlsson@purdue.edu (Marta Karlsson) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

-- 
Graham Sokolov -- Technische Universität München
"We don't sign stars. We build them."

From dmartinez@rwth-aachen.de Sun Jul 03 19:46:11 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!dmartinez
From: dmartinez@rwth-aachen.de (Diego Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jul03.194611.8217@rwth-aachen.de>
Date: Sun, 03 Jul 1994 19:46:11 GMT
References: <1994Jul01.064511.3746@purdue.edu> <1994Jul02.043211.2336@tum.de>
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In article <1994Jul02.043211.2336@tum.de>, gsokolov@tum.de (Graham Sokolov) 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!

-- 
Diego Martínez -- RWTH Aachen Informatik
"Hold for relay."