From blee@cmu.edu Tue Feb 28 22:48:45 1995
Path: ashpoly!cascade!mxgate!coyoacan!cmu!blee
From: blee@cmu.edu (Bill Lee)
Newsgroups: comp.sys.m68k
Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Feb28.224845.4840@cmu.edu>
Date: Tue, 28 Feb 1995 22:48:45 GMT
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.
Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

Anyone running this on a Quadra 840AV with the 68040?

-- 
Bill Lee
Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS.
------------------------------------------------------------

From gsilva@kth.se Wed Mar 01 16:05:45 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!gsilva
From: gsilva@kth.se (Göran Silva)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Mar01.160545.9532@kth.se>
Date: Wed, 01 Mar 1995 16:05:45 GMT
References: <1995Feb28.224845.4840@cmu.edu>
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In article <1995Feb28.224845.4840@cmu.edu>, blee@cmu.edu (Bill Lee) 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.

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

-- 
Göran Silva
Tape trading list upon request. SASE required for international mail.

From tkowalski@hanse.de Thu Mar 02 10:32:45 1995
Path: ashpoly!cascade!transat!ukc!fennimore!hanse!tkowalski
From: tkowalski@hanse.de (Tyler Kowalski)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Mar02.103245.9570@hanse.de>
Date: Thu, 02 Mar 1995 10:32:45 GMT
References: <1995Feb28.224845.4840@cmu.edu>
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In article <1995Feb28.224845.4840@cmu.edu>, blee@cmu.edu (Bill Lee) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Tyler Kowalski | tkowalski@hanse.de
PGP Key fingerprint: 8508 FC35 FC42 09B5
"Keep the channels open."

From lsokolov@utexas.edu Fri Mar 03 18:40:45 1995
Path: ashpoly!cascade!bigsur!utexas!lsokolov
From: lsokolov@utexas.edu (Lisa Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Mar03.184045.1936@utexas.edu>
Date: Fri, 03 Mar 1995 18:40:45 GMT
References: <1995Feb28.224845.4840@cmu.edu>
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In article <1995Feb28.224845.4840@cmu.edu>, blee@cmu.edu (Bill Lee) 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.

-- 
Lisa Sokolov
Tape trading list upon request. SASE required for international mail.