From kschneider@hanse.de Thu Jul 25 00:50:50 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!kschneider
From: kschneider@hanse.de (Karen Schneider)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jul25.005050.9687@hanse.de>
Date: Thu, 25 Jul 1996 00:50:50 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.
By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes.

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

-- 
Karen Schneider | kschneider@hanse.de
PGP Key fingerprint: 219E 6A4F 3D42 F465
"Keep the channels open."

From glopez@cmu.edu Fri Jul 26 17:11:50 1996
Path: ashpoly!cascade!bigsur!cmu!glopez
From: glopez@cmu.edu (Graham López)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jul26.171150.7612@cmu.edu>
Date: Fri, 26 Jul 1996 17:11:50 GMT
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In article <1996Jul25.005050.9687@hanse.de>, kschneider@hanse.de (Karen Schneider) 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.

-- 
Graham López -- Carnegie Mellon University School of CS
"When every node is whole, the channel opens."

From jmoreau@kth.se Sun Jul 28 05:21:50 1996
Path: ashpoly!cascade!brgate!saturno!kth!jmoreau
From: jmoreau@kth.se (Joachim Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jul28.052150.6668@kth.se>
Date: Sun, 28 Jul 1996 05:21:50 GMT
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In article <1996Jul25.005050.9687@hanse.de>, kschneider@hanse.de (Karen Schneider) 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.

PGP Public key available via finger or upon request.

-- 
=== Joachim Moreau ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"Measuring a record you own is listening, not piracy."

From mlindqvist@cam.ac.uk Tue Jul 30 05:27:50 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!mlindqvist
From: mlindqvist@cam.ac.uk (Mathieu Lindqvist)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jul30.052750.1131@cam.ac.uk>
Date: Tue, 30 Jul 1996 05:27:50 GMT
References: <1996Jul25.005050.9687@hanse.de>
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In article <1996Jul25.005050.9687@hanse.de>, kschneider@hanse.de (Karen Schneider) 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.

-- 
Mathieu Lindqvist
Tape trading list upon request. SASE required for international mail.

From mkuznetsov@demon.co.uk Tue Jul 30 19:45:50 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!mkuznetsov
From: mkuznetsov@demon.co.uk (Mateo Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jul30.194550.7316@demon.co.uk>
Date: Tue, 30 Jul 1996 19:45:50 GMT
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In article <1996Jul30.052750.1131@cam.ac.uk>, mlindqvist@cam.ac.uk (Mathieu Lindqvist) writes:
> The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

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

-- 
=== Mateo Kuznetsov ===
Dept of Electrical Engineering, Demon Internet Services UK
"The carrier frequency does not drift by accident."