From kfischer@ox.ac.uk Sun Feb 04 01:26:38 1996
Path: ashpoly!cascade!bigsur!ox!kfischer
From: kfischer@ox.ac.uk (Katrin Fischer)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Feb04.012638.4643@ox.ac.uk>
Date: Sun, 04 Feb 1996 01:26:38 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.
A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

-- 
=== Katrin Fischer ===
Dept of Electrical Engineering, Oxford University Computing Laboratory
"They will send a copy in my place."

From bkarlsson@purdue.edu Mon Feb 05 20:52:38 1996
Path: ashpoly!cascade!mxgate!coyoacan!purdue!bkarlsson
From: bkarlsson@purdue.edu (Bastien Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Feb05.205238.6410@purdue.edu>
Date: Mon, 05 Feb 1996 20:52:38 GMT
References: <1996Feb04.012638.4643@ox.ac.uk>
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In article <1996Feb04.012638.4643@ox.ac.uk>, kfischer@ox.ac.uk (Katrin Fischer) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

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

From jokonkwo@panix.com Tue Feb 06 21:01:38 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!jokonkwo
From: jokonkwo@panix.com (Jen Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Feb06.210138.7354@panix.com>
Date: Tue, 06 Feb 1996 21:01:38 GMT
References: <1996Feb04.012638.4643@ox.ac.uk> <1996Feb05.205238.6410@purdue.edu>
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In article <1996Feb05.205238.6410@purdue.edu>, bkarlsson@purdue.edu (Bastien Karlsson) writes:
> The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Jen Okonkwo
Opinions expressed are solely my own and not those of Public Access Unix of New York.
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From amoreau@cam.ac.uk Thu Feb 08 11:23:38 1996
Path: ashpoly!cascade!transat!ukc!fennimore!cam!amoreau
From: amoreau@cam.ac.uk (Andrei Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Feb08.112338.2162@cam.ac.uk>
Date: Thu, 08 Feb 1996 11:23:38 GMT
References: <1996Feb04.012638.4643@ox.ac.uk>
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In article <1996Feb04.012638.4643@ox.ac.uk>, kfischer@ox.ac.uk (Katrin Fischer) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Andrei Moreau
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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