From mkuznetsov@pipeline.com Sun Dec 01 04:36:45 1996
Path: ashpoly!cascade!bigsur!pipeline!mkuznetsov
From: mkuznetsov@pipeline.com (Morag Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Dec01.043645.9766@pipeline.com>
Date: Sun, 01 Dec 1996 04:36:45 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.
Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

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

-- 
Morag Kuznetsov
Tape trading list upon request. SASE required for international mail.

From ymartinez@mindspring.com Mon Dec 02 10:58:45 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!ymartinez
From: ymartinez@mindspring.com (Yuki Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Dec02.105845.6091@mindspring.com>
Date: Mon, 02 Dec 1996 10:58:45 GMT
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In article <1996Dec01.043645.9766@pipeline.com>, mkuznetsov@pipeline.com (Morag Kuznetsov) 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.

-- 
Yuki Martínez
Tape trading list upon request. SASE required for international mail.

From dduarte@rwth-aachen.de Mon Dec 02 14:15:45 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!dduarte
From: dduarte@rwth-aachen.de (Diego Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Dec02.141545.9422@rwth-aachen.de>
Date: Mon, 02 Dec 1996 14:15:45 GMT
References: <1996Dec01.043645.9766@pipeline.com>
Organization: RWTH Aachen Informatik
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In article <1996Dec01.043645.9766@pipeline.com>, mkuznetsov@pipeline.com (Morag Kuznetsov) writes:
> 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.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
=== Diego Duarte ===
Dept of Electrical Engineering, RWTH Aachen Informatik
"5 sigma is a discovery. 7 is a question."