From lsato@pipeline.com Fri Mar 25 12:33:25 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!lsato From: lsato@pipeline.com (Lars Sato) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Mar25.123325.7042@pipeline.com> Date: Fri, 25 Mar 1994 12:33:25 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. 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. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Lars Sato *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From msato@stanford.edu Sat Mar 26 12:04:25 1994 Path: ashpoly!cascade!bigsur!stanford!msato From: msato@stanford.edu (Mathieu Sato) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Mar26.120425.8788@stanford.edu> Date: Sat, 26 Mar 1994 12:04:25 GMT References: <1994Mar25.123325.7042@pipeline.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Mar25.123325.7042@pipeline.com>, lsato@pipeline.com (Lars Sato) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > 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. Top-posters will be placed in my ~/.killfile without notice. -- Mathieu Sato -- Stanford University Computer Systems Lab "The carrier frequency does not drift by accident." From alarsson@cam.ac.uk Sun Mar 27 14:32:25 1994 Path: ashpoly!cascade!bigsur!cam!alarsson From: alarsson@cam.ac.uk (Aiko Larsson) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Mar27.143225.5530@cam.ac.uk> Date: Sun, 27 Mar 1994 14:32:25 GMT References: <1994Mar25.123325.7042@pipeline.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar25.123325.7042@pipeline.com>, lsato@pipeline.com (Lars Sato) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Aiko Larsson Practical Peripherals 14.4 @ 28,800 bps "The carrier frequency does not drift by accident." From bvasiliev@kth.se Mon Mar 28 01:43:25 1994 Path: ashpoly!cascade!brgate!saturno!kth!bvasiliev From: bvasiliev@kth.se (Bastien Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Mar28.014325.5505@kth.se> Date: Mon, 28 Mar 1994 01:43:25 GMT References: <1994Mar25.123325.7042@pipeline.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar25.123325.7042@pipeline.com>, lsato@pipeline.com (Lars Sato) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Bastien Vasiliev Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------