From rjohansson@stanford.edu Fri Feb 17 08:40:32 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!rjohansson From: rjohansson@stanford.edu (Renata Johansson) Newsgroups: comp.sys.m68k Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb17.084032.8321@stanford.edu> Date: Fri, 17 Feb 1995 08:40:32 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? 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? -- Renata Johansson Tape trading list upon request. SASE required for international mail. From rlarsson@ox.ac.uk Fri Feb 17 21:50:32 1995 Path: ashpoly!cascade!bigsur!ox!rlarsson From: rlarsson@ox.ac.uk (Rodrigo Larsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb17.215032.4121@ox.ac.uk> Date: Fri, 17 Feb 1995 21:50:32 GMT References: <1995Feb17.084032.8321@stanford.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Feb17.084032.8321@stanford.edu>, rjohansson@stanford.edu (Renata Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > 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. -- Rodrigo Larsson *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From ttanaka@unam.mx Sun Feb 19 12:39:32 1995 Path: ashpoly!cascade!mxgate!coyoacan!unam!ttanaka From: ttanaka@unam.mx (Tobias Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb19.123932.1439@unam.mx> Date: Sun, 19 Feb 1995 12:39:32 GMT References: <1995Feb17.084032.8321@stanford.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb17.084032.8321@stanford.edu>, rjohansson@stanford.edu (Renata Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- === Tobias Tanaka === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Row 14. No joke." From ksuzuki@cmu.edu Mon Feb 20 20:59:32 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!ksuzuki From: ksuzuki@cmu.edu (Kenji Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb20.205932.3342@cmu.edu> Date: Mon, 20 Feb 1995 20:59:32 GMT References: <1995Feb17.084032.8321@stanford.edu> <1995Feb19.123932.1439@unam.mx> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb19.123932.1439@unam.mx>, ttanaka@unam.mx (Tobias Tanaka) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Kenji Suzuki *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From knovak@mindspring.com Thu Feb 23 00:40:32 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!knovak From: knovak@mindspring.com (Kirsty Novak) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb23.004032.2463@mindspring.com> Date: Thu, 23 Feb 1995 00:40:32 GMT References: <1995Feb17.084032.8321@stanford.edu> <1995Feb19.123932.1439@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb19.123932.1439@unam.mx>, ttanaka@unam.mx (Tobias Tanaka) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Top-posters will be placed in my ~/.killfile without notice. -- Kirsty Novak US Robotics Courier V.34 @ 9600 Telebit bps "Hold for relay."