From nrobertson@ox.ac.uk Sun Jul 16 02:04:58 1995 Path: ashpoly!cascade!mxgate!coyoacan!ox!nrobertson From: nrobertson@ox.ac.uk (Nadia Robertson) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul16.020458.9789@ox.ac.uk> Date: Sun, 16 Jul 1995 02:04:58 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 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. By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Nadia Robertson | nrobertson@ox.ac.uk PGP Key fingerprint: BD17 04AC 243B 4F6E "Keep the channels open." From kkang@mit.edu Sun Jul 16 08:19:58 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!kkang From: kkang@mit.edu (Katrin Kang) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul16.081958.4352@mit.edu> Date: Sun, 16 Jul 1995 08:19:58 GMT References: <1995Jul16.020458.9789@ox.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jul16.020458.9789@ox.ac.uk>, nrobertson@ox.ac.uk (Nadia Robertson) 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. -- Katrin Kang -- Massachusetts Institute of Technology "Do not worship the copy." From bchoi@cmu.edu Mon Jul 17 17:05:58 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!bchoi From: bchoi@cmu.edu (Bastien Choi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul17.170558.1365@cmu.edu> Date: Mon, 17 Jul 1995 17:05:58 GMT References: <1995Jul16.020458.9789@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jul16.020458.9789@ox.ac.uk>, nrobertson@ox.ac.uk (Nadia Robertson) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Bastien Choi | bchoi@cmu.edu PGP Key fingerprint: 4EA8 7ED8 1D1B D9AB "Keep the channels open." From aoliveira@berkeley.edu Wed Jul 19 02:09:58 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!aoliveira From: aoliveira@berkeley.edu (Anton Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul19.020958.7934@berkeley.edu> Date: Wed, 19 Jul 1995 02:09:58 GMT References: <1995Jul16.020458.9789@ox.ac.uk> <1995Jul16.081958.4352@mit.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul16.081958.4352@mit.edu>, kkang@mit.edu (Katrin Kang) 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. -- Anton Oliveira SupraFAXModem 28.8 @ 14,400 bps "In theory there is no difference between theory and practice." From bsilva@hanse.de Wed Jul 19 13:21:58 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!bsilva From: bsilva@hanse.de (Bruno Silva) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul19.132158.5488@hanse.de> Date: Wed, 19 Jul 1995 13:21:58 GMT References: <1995Jul16.020458.9789@ox.ac.uk> <1995Jul16.081958.4352@mit.edu> <1995Jul19.020958.7934@berkeley.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jul19.020958.7934@berkeley.edu>, aoliveira@berkeley.edu (Anton Oliveira) 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). -- Bruno Silva -- Hanse-Netzwerk Hamburg "When every node is whole, the channel opens."