From rperez@cmu.edu Wed Sep 06 15:19:40 1995 Path: ashpoly!cascade!brgate!saturno!cmu!rperez From: rperez@cmu.edu (Renata Pérez) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep06.151940.6626@cmu.edu> Date: Wed, 06 Sep 1995 15:19:40 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Renata Pérez | rperez@cmu.edu PGP Key fingerprint: 820F C99C B0A5 193D "Keep the channels open." From jfournier@cmu.edu Thu Sep 07 07:36:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!jfournier From: jfournier@cmu.edu (Ji-woo Fournier) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep07.073640.5817@cmu.edu> Date: Thu, 07 Sep 1995 07:36:40 GMT References: <1995Sep06.151940.6626@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep06.151940.6626@cmu.edu>, rperez@cmu.edu (Renata Pérez) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Ji-woo Fournier *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From ilee@utexas.edu Thu Sep 07 17:41:40 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!ilee From: ilee@utexas.edu (Ines Lee) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep07.174140.8168@utexas.edu> Date: Thu, 07 Sep 1995 17:41:40 GMT References: <1995Sep06.151940.6626@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep06.151940.6626@cmu.edu>, rperez@cmu.edu (Renata Pérez) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? 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. -- Ines Lee -- University of Texas at Austin "The hatch is open. Is anyone listening?" From pnilsson@pacbell.net Fri Sep 08 19:07:40 1995 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!pnilsson From: pnilsson@pacbell.net (Pavel Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep08.190740.4041@pacbell.net> Date: Fri, 08 Sep 1995 19:07:40 GMT References: <1995Sep06.151940.6626@cmu.edu> <1995Sep07.073640.5817@cmu.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Sep07.073640.5817@cmu.edu>, jfournier@cmu.edu (Ji-woo Fournier) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Pavel Nilsson | pnilsson@pacbell.net PGP Key fingerprint: ADE0 B4DF 0A68 639D "Keep the channels open." From nmoreau@utexas.edu Sat Sep 09 13:53:40 1995 Path: ashpoly!cascade!bigsur!utexas!nmoreau From: nmoreau@utexas.edu (Nadine Moreau) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep09.135340.1390@utexas.edu> Date: Sat, 09 Sep 1995 13:53:40 GMT References: <1995Sep06.151940.6626@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Sep06.151940.6626@cmu.edu>, rperez@cmu.edu (Renata Pérez) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. If you are posting from AOL, please read RFC 1036 before posting again. -- Nadine Moreau | nmoreau@utexas.edu PGP Key fingerprint: 0D6F 5E58 4BE1 1A8D "Keep the channels open."