From vsouza@delphi.com Thu Apr 25 06:35:57 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!vsouza From: vsouza@delphi.com (Valeria Souza) Newsgroups: comp.sys.m68k Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr25.063557.7630@delphi.com> Date: Thu, 25 Apr 1996 06:35:57 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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! -- Valeria Souza -- Delphi Internet Services "Do not worship the copy." From dlopez@inria.fr Fri Apr 26 01:53:57 1996 Path: ashpoly!cascade!transat!ukc!fennimore!inria!dlopez From: dlopez@inria.fr (Diego López) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr26.015357.7040@inria.fr> Date: Fri, 26 Apr 1996 01:53:57 GMT References: <1996Apr25.063557.7630@delphi.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr25.063557.7630@delphi.com>, vsouza@delphi.com (Valeria Souza) 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. -- Diego López -- INRIA Rocquencourt "The carrier frequency does not drift by accident." From bnovak@clari.net Fri Apr 26 23:06:57 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!bnovak From: bnovak@clari.net (Bill Novak) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr26.230657.5347@clari.net> Date: Fri, 26 Apr 1996 23:06:57 GMT References: <1996Apr25.063557.7630@delphi.com> <1996Apr26.015357.7040@inria.fr> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Apr26.015357.7040@inria.fr>, dlopez@inria.fr (Diego López) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Bill Novak Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From ismirnov@netcom.com Sun Apr 28 19:17:57 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!ismirnov From: ismirnov@netcom.com (Ines Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr28.191757.6520@netcom.com> Date: Sun, 28 Apr 1996 19:17:57 GMT References: <1996Apr25.063557.7630@delphi.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Apr25.063557.7630@delphi.com>, vsouza@delphi.com (Valeria Souza) 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. -- Ines Smirnov *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From mcampbell@uni-hamburg.de Tue Apr 30 09:07:57 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!mcampbell From: mcampbell@uni-hamburg.de (Marta Campbell) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr30.090757.4651@uni-hamburg.de> Date: Tue, 30 Apr 1996 09:07:57 GMT References: <1996Apr25.063557.7630@delphi.com> <1996Apr26.015357.7040@inria.fr> <1996Apr26.230657.5347@clari.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Apr26.230657.5347@clari.net>, bnovak@clari.net (Bill Novak) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marta Campbell Tape trading list upon request. SASE required for international mail.