From atanaka@illinois.edu Fri Nov 03 14:38:51 1995 Path: ashpoly!cascade!bigsur!illinois!atanaka From: atanaka@illinois.edu (Amy Tanaka) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov03.143851.7237@illinois.edu> Date: Fri, 03 Nov 1995 14:38:51 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N 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. By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Anyone running this on a Quadra 840AV with the 68040? -- Amy Tanaka -- University of Illinois Urbana-Champaign "Marcus is not one man." From skuznetsov@demon.co.uk Fri Nov 03 18:49:51 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!skuznetsov From: skuznetsov@demon.co.uk (Sun-mi Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov03.184951.9133@demon.co.uk> Date: Fri, 03 Nov 1995 18:49:51 GMT References: <1995Nov03.143851.7237@illinois.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Nov03.143851.7237@illinois.edu>, atanaka@illinois.edu (Amy Tanaka) 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. -- Sun-mi Kuznetsov "Tape doesn't lie at 02:14. Ears do." Amiga 1200 (Blizzard 030/50) / TOS 4.04 From ebrennan@mindspring.com Sat Nov 04 10:25:51 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!ebrennan From: ebrennan@mindspring.com (Elaine Brennan) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov04.102551.5180@mindspring.com> Date: Sat, 04 Nov 1995 10:25:51 GMT References: <1995Nov03.143851.7237@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov03.143851.7237@illinois.edu>, atanaka@illinois.edu (Amy Tanaka) 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. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Elaine Brennan Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From hgarcia@clari.net Mon Nov 06 00:25:51 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!hgarcia From: hgarcia@clari.net (Hana García) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov06.002551.6948@clari.net> Date: Mon, 06 Nov 1995 00:25:51 GMT References: <1995Nov03.143851.7237@illinois.edu> <1995Nov03.184951.9133@demon.co.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov03.184951.9133@demon.co.uk>, skuznetsov@demon.co.uk (Sun-mi Kuznetsov) 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. -- Hana García *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From tcampbell@tum.de Tue Nov 07 19:14:51 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!tcampbell From: tcampbell@tum.de (Tomas Campbell) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov07.191451.4120@tum.de> Date: Tue, 07 Nov 1995 19:14:51 GMT References: <1995Nov03.143851.7237@illinois.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov03.143851.7237@illinois.edu>, atanaka@illinois.edu (Amy Tanaka) 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. -- Tomas Campbell *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0