From tgarcia@utexas.edu Mon Mar 14 19:44:03 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!tgarcia
From: tgarcia@utexas.edu (Tobias García)
Newsgroups: comp.sys.m68k
Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Mar14.194403.4304@utexas.edu>
Date: Mon, 14 Mar 1994 19:44:03 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

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

-- 
Tobias García | tgarcia@utexas.edu
PGP Key fingerprint: D190 1A36 2110 C2EC
"Keep the channels open."

From ggirard@uni-hamburg.de Tue Mar 15 21:58:03 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!ggirard
From: ggirard@uni-hamburg.de (Göran Girard)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Mar15.215803.6640@uni-hamburg.de>
Date: Tue, 15 Mar 1994 21:58:03 GMT
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In article <1994Mar14.194403.4304@utexas.edu>, tgarcia@utexas.edu (Tobias García) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Göran Girard <ggirard@uni-hamburg.de>
US Robotics Courier V.34 @ ISDN 64k bps
"Hold for relay."

From rkang@pipeline.com Fri Mar 18 01:54:03 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!rkang
From: rkang@pipeline.com (Rodrigo Kang)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Mar18.015403.5932@pipeline.com>
Date: Fri, 18 Mar 1994 01:54:03 GMT
References: <1994Mar14.194403.4304@utexas.edu> <1994Mar15.215803.6640@uni-hamburg.de>
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In article <1994Mar15.215803.6640@uni-hamburg.de>, ggirard@uni-hamburg.de (Göran Girard) writes:
> Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

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

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
=== Rodrigo Kang ===
Dept of Electrical Engineering, The Pipeline Internet Network
"There are 14 nodes and only 10 countries. Count again."