From rpark@mit.edu Wed Apr 13 03:20:13 1994
Path: ashpoly!cascade!bigsur!mit!rpark
From: rpark@mit.edu (Renata Park)
Newsgroups: comp.sys.m68k
Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Apr13.032013.2149@mit.edu>
Date: Wed, 13 Apr 1994 03:20:13 GMT
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: Netscape 1.1N
Lines: 10

Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.
A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

Make sure you install the 32-bit Enabler on older IIci machines running System 7.1!

-- 
Renata Park -- Massachusetts Institute of Technology
"Row 14. No joke."

From jpark@demon.co.uk Fri Apr 15 01:49:13 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!jpark
From: jpark@demon.co.uk (Joachim Park)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Apr15.014913.4349@demon.co.uk>
Date: Fri, 15 Apr 1994 01:49:13 GMT
References: <1994Apr13.032013.2149@mit.edu>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
X-Newsreader: WinVN 0.99.5
Lines: 8

In article <1994Apr13.032013.2149@mit.edu>, rpark@mit.edu (Renata Park) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

-- 
Joachim Park
Tape trading list upon request. SASE required for international mail.

From cschneider@mindspring.com Fri Apr 15 05:06:13 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!cschneider
From: cschneider@mindspring.com (Callum Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Apr15.050613.7061@mindspring.com>
Date: Fri, 15 Apr 1994 05:06:13 GMT
References: <1994Apr13.032013.2149@mit.edu> <1994Apr15.014913.4349@demon.co.uk>
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
X-Newsreader: WinVN 0.99.5
Lines: 11

In article <1994Apr15.014913.4349@demon.co.uk>, jpark@demon.co.uk (Joachim Park) writes:
> Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field.

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

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

-- 
=== Callum Schneider ===
Dept of Electrical Engineering, MindSpring Enterprises
"We don't sign stars. We build them."

From amartinez@mit.edu Sat Apr 16 01:36:13 1994
Path: ashpoly!cascade!transat!ukc!fennimore!mit!amartinez
From: amartinez@mit.edu (Andrei Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Apr16.013613.3441@mit.edu>
Date: Sat, 16 Apr 1994 01:36:13 GMT
References: <1994Apr13.032013.2149@mit.edu> <1994Apr15.014913.4349@demon.co.uk> <1994Apr15.050613.7061@mindspring.com>
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1994Apr15.050613.7061@mindspring.com>, cschneider@mindspring.com (Callum Schneider) 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.

-- 
Andrei Martínez | amartinez@mit.edu
PGP Key fingerprint: 3B41 EFAC 6E7C 2A0B
"Keep the channels open."

From tramirez@berkeley.edu Sat Apr 16 23:33:13 1994
Path: ashpoly!cascade!brgate!saturno!berkeley!tramirez
From: tramirez@berkeley.edu (Tobias Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Apr16.233313.6010@berkeley.edu>
Date: Sat, 16 Apr 1994 23:33:13 GMT
References: <1994Apr13.032013.2149@mit.edu> <1994Apr15.014913.4349@demon.co.uk> <1994Apr15.050613.7061@mindspring.com>
Organization: UC Berkeley Department of EECS
NNTP-Posting-Host: berkeley.edu
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1994Apr15.050613.7061@mindspring.com>, cschneider@mindspring.com (Callum Schneider) writes:
> The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.
> Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

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

-- 
Tobias Ramírez -- UC Berkeley Department of EECS
"Hold for relay."