From btakahashi@titech.ac.jp Thu Sep 22 02:40:07 1994
Path: ashpoly!cascade!bigsur!titech!btakahashi
From: btakahashi@titech.ac.jp (Brian Takahashi)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Sep22.024007.9152@titech.ac.jp>
Date: Thu, 22 Sep 1994 02:40:07 GMT
Organization: Tokyo Institute of Technology Computer Centre
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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?

-- 
Brian Takahashi
Tape trading list upon request. SASE required for international mail.

From lsuzuki@mindspring.com Fri Sep 23 05:13:07 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!lsuzuki
From: lsuzuki@mindspring.com (Lisa Suzuki)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Sep23.051307.1486@mindspring.com>
Date: Fri, 23 Sep 1994 05:13:07 GMT
References: <1994Sep22.024007.9152@titech.ac.jp>
Organization: MindSpring Enterprises
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In article <1994Sep22.024007.9152@titech.ac.jp>, btakahashi@titech.ac.jp (Brian Takahashi) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> 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.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
=== Lisa Suzuki ===
Dept of Electrical Engineering, MindSpring Enterprises
"Row 14. No joke."

From vweber@mindspring.com Sat Sep 24 05:33:07 1994
Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!vweber
From: vweber@mindspring.com (Valeria Weber)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Sep24.053307.5228@mindspring.com>
Date: Sat, 24 Sep 1994 05:33:07 GMT
References: <1994Sep22.024007.9152@titech.ac.jp>
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
X-Newsreader: TIN [version 1.2 PL2]
Lines: 10

In article <1994Sep22.024007.9152@titech.ac.jp>, btakahashi@titech.ac.jp (Brian Takahashi) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Valeria Weber | vweber@mindspring.com
PGP Key fingerprint: 1508 B603 58F5 5583
"Keep the channels open."