From ikarlsson@cam.ac.uk Fri Sep 23 02:11:08 1994 Path: ashpoly!cascade!bigsur!cam!ikarlsson From: ikarlsson@cam.ac.uk (Ines Karlsson) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep23.021108.5424@cam.ac.uk> Date: Fri, 23 Sep 1994 02:11:08 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? 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. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Ines Karlsson *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From reriksson@purdue.edu Sat Sep 24 10:54:08 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!reriksson From: reriksson@purdue.edu (Renata Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep24.105408.5362@purdue.edu> Date: Sat, 24 Sep 1994 10:54:08 GMT References: <1994Sep23.021108.5424@cam.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Sep23.021108.5424@cam.ac.uk>, ikarlsson@cam.ac.uk (Ines Karlsson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > 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. Top-posters will be placed in my ~/.killfile without notice. -- Renata Eriksson Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From hreyes@mindspring.com Sun Sep 25 15:13:08 1994 Path: ashpoly!cascade!brgate!saturno!mindspring!hreyes From: hreyes@mindspring.com (Heather Reyes) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep25.151308.6983@mindspring.com> Date: Sun, 25 Sep 1994 15:13:08 GMT References: <1994Sep23.021108.5424@cam.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Sep23.021108.5424@cam.ac.uk>, ikarlsson@cam.ac.uk (Ines Karlsson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. If you are posting from AOL, please read RFC 1036 before posting again. -- Heather Reyes "Hardware is temporary. The signal survives." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From dkim@inria.fr Sun Sep 25 18:30:08 1994 Path: ashpoly!cascade!transat!ukc!fennimore!inria!dkim From: dkim@inria.fr (Diego Kim) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep25.183008.3526@inria.fr> Date: Sun, 25 Sep 1994 18:30:08 GMT References: <1994Sep23.021108.5424@cam.ac.uk> <1994Sep24.105408.5362@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Sep24.105408.5362@purdue.edu>, reriksson@purdue.edu (Renata Eriksson) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. > Top-posters will be placed in my ~/.killfile without notice. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Diego Kim Hayes Optima 288 @ 28,800 bps "Hardware is temporary. The signal survives." From ddubois@mindspring.com Mon Sep 26 10:58:08 1994 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!ddubois From: ddubois@mindspring.com (Diego Dubois) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep26.105808.8085@mindspring.com> Date: Mon, 26 Sep 1994 10:58:08 GMT References: <1994Sep23.021108.5424@cam.ac.uk> <1994Sep24.105408.5362@purdue.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Sep24.105408.5362@purdue.edu>, reriksson@purdue.edu (Renata Eriksson) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. > Top-posters will be placed in my ~/.killfile without notice. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Diego Dubois *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0