From msouza@uni-hamburg.de Mon Feb 14 17:35:52 1994 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!msouza From: msouza@uni-hamburg.de (Marisol Souza) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Feb14.173552.9664@uni-hamburg.de> Date: Mon, 14 Feb 1994 17:35:52 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. 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? -- Marisol Souza Tape trading list upon request. SASE required for international mail. From stakahashi@kiae.su Tue Feb 15 07:37:52 1994 Path: ashpoly!cascade!bigsur!kiae!stakahashi From: stakahashi@kiae.su (Sven Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Feb15.073752.8150@kiae.su> Date: Tue, 15 Feb 1994 07:37:52 GMT References: <1994Feb14.173552.9664@uni-hamburg.de> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Feb14.173552.9664@uni-hamburg.de>, msouza@uni-hamburg.de (Marisol Souza) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Sven Takahashi *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From mrodriguez@mit.edu Wed Feb 16 12:07:52 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!mrodriguez From: mrodriguez@mit.edu (Mathieu Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Feb16.120752.4167@mit.edu> Date: Wed, 16 Feb 1994 12:07:52 GMT References: <1994Feb14.173552.9664@uni-hamburg.de> <1994Feb15.073752.8150@kiae.su> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb15.073752.8150@kiae.su>, stakahashi@kiae.su (Sven Takahashi) writes: > The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Mathieu Rodríguez | mrodriguez@mit.edu PGP Key fingerprint: CBD7 CC91 8A14 BA1F "Keep the channels open." From dhughes@utexas.edu Thu Feb 17 07:46:52 1994 Path: ashpoly!cascade!brgate!saturno!utexas!dhughes From: dhughes@utexas.edu (Dave Hughes) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Feb17.074652.8810@utexas.edu> Date: Thu, 17 Feb 1994 07:46:52 GMT References: <1994Feb14.173552.9664@uni-hamburg.de> <1994Feb15.073752.8150@kiae.su> <1994Feb16.120752.4167@mit.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Feb16.120752.4167@mit.edu>, mrodriguez@mit.edu (Mathieu Rodríguez) writes: > Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Dave Hughes SupraFAXModem 28.8 @ ISDN 64k bps "Tape doesn't lie at 02:14. Ears do."