From eweber@kiae.su Sat Nov 16 15:27:00 1996
Path: ashpoly!cascade!brgate!saturno!kiae!eweber
From: eweber@kiae.su (Emi Weber)
Newsgroups: comp.sys.m68k
Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Nov16.152700.4773@kiae.su>
Date: Sat, 16 Nov 1996 15:27:00 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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!

-- 
Emi Weber
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
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From arodriguez@berkeley.edu Sat Nov 16 23:33:00 1996
Path: ashpoly!cascade!mxgate!coyoacan!berkeley!arodriguez
From: arodriguez@berkeley.edu (Amy Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Nov16.233300.1222@berkeley.edu>
Date: Sat, 16 Nov 1996 23:33:00 GMT
References: <1996Nov16.152700.4773@kiae.su>
Organization: UC Berkeley Department of EECS
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In article <1996Nov16.152700.4773@kiae.su>, eweber@kiae.su (Emi Weber) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

-- 
=== Amy Rodríguez ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"5 sigma is a discovery. 7 is a question."

From jcampbell@kiae.su Mon Nov 18 13:20:00 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!jcampbell
From: jcampbell@kiae.su (Jen Campbell)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Nov18.132000.4908@kiae.su>
Date: Mon, 18 Nov 1996 13:20:00 GMT
References: <1996Nov16.152700.4773@kiae.su>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Nov16.152700.4773@kiae.su>, eweber@kiae.su (Emi Weber) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

-- 
Jen Campbell
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
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