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1 BRL-CAD Users Group Meeting 2002 Friday, October 25, 2002 & Mac OS X Christopher Sean Morrison morrison@arl.army.mil Quantum Research International, Inc.
2 BRL-CAD & Mac OS X Topics: Apple Computer, Inc s new platform Architecture considerations BRL-CAD and UNIX The actual port to Mac OS X Performance issues Future direction BRL-CAD Users Group Meeting
3 Apple Computer, Inc. Mac OS X is a modern operating system that combines the power and stability of UNIX with the simplicity and elegance of the Macintosh. Apple is the largest UNIX-based platform vendor on the planet. BRL-CAD Users Group Meeting
4 Mac OS X New BSD-based operating system Open-source kernel (Darwin), some libraries and APIs as well Standards compliance OpenGL, POSIX, MPEG4, Java2, IPv6, LDAPv3, IPSec,, SSL, SSH2, Interoperability with Windows and UNIX Popular commercial software available Word, Excel, PowerPoint, Internet Explorer, Photoshop, Mathematica,, Pagemaker, InDesign, BRL-CAD Users Group Meeting
5 Multiprocessing & More Symmetric multiprocessing architecture available Altivec vector pipeline (aka Velocity Engine TM ) BRL-CAD Users Group Meeting
6 Darwin Core open-source operating system X Server support Xdarwin and XonX POSIX standard compliance supported Threading (POSIX and Mach threads available) Shell sysctl interface OpenGL support hardware accellerated,, double-buffered windows, per- pixel alpha channel & fade control, and more Quartz extreme BRL-CAD Users Group Meeting
7 Darwin BRL-CAD Users Group Meeting
8 BRL-CAD & UNIX BRL-CAD is designed to work best in a UNIX-based environment Many compact and well-defined tools that perform particular tasks Presently 397 tools, utilities, commands, Commands may be chained together for flexible usage BRL-CAD Users Group Meeting
9 Why Mac OS X? Open standards compliance It is UNIX based It has a POSIX command line interface and tools Apple has a respectable history of reliability and good design in both software and hardware It runs Microsoft Office, Photoshop, Mathematica, It s s the largest UNIX-based platform BRL-CAD Users Group Meeting
10 The Port Bulk of work (90%) was done in less than half an hour Iterative and incremental approach Files modified: sh/machinetype machinetype.sh Cakefile.defs h/conf.h h/machine.h libbu/parallel.c libfb/ libdm/ BRL-CAD Users Group Meeting
11 Iterative and Incremental Process Get sh/machinetype machinetype.sh to work Run setup.sh sh successfully Get cake to work Stub a base configuration into Cakefile.defs Add architecture details to h/machine.h Compile, modify h/conf.h,, and repeat until all errors and (most) warnings are eliminated BRL-CAD Users Group Meeting
12 Problems Encountered Adding the architecture piece-wise unveiled assumptions and dependancies that were not expected E.g. X Windows support on UNIX Subtle bugs (some nasty) that were not evident on other platforms emerged Those problems have been fixed BRL-CAD Users Group Meeting
13 Extra Functionality Needed Multiple processor support (SMP) working Modified bu_avail_cpus() in in libbu/parallel.c Added something more functional than the debug framebuffer Added X Windows support configuration options Add OpenGL support configuration options Other ideas for later BRL-CAD Users Group Meeting
14 Performance Running the BRL-CAD benchmark bench/run.sh actually runs the test results stored in the file named summary sh invokes the benchmark run interactively, opening up a window per image bench/try.sh For the time being, you will need X Windows to be installed Interpreting the results Apple has done impressive optimizations Uses the open source GNU Compiler Collection (GCC 3.1) The hardware takes significant advantage of L2 cache available G4 500 s s have 1MB unified L2 cache per chip G4 800 and 1000 s s have 256KB L2 cache and 1MB L3 cache BRL-CAD Users Group Meeting
15 Benchmark Results average rays/second (rtfm) G Dual G G BRL-CAD Users Group Meeting
16 Demo BRL-CAD Users Group Meeting
17 Comparison to Linux on PPC Yellow Dog Linux 2.3 with default install gave approximately 25% slower runtime performance Compiles significantly faster than Darwin 25 minutes as opposed to 1.5 hours Hints that Apple has better compiler optimizations and perhaps better run-time libraries BRL-CAD Users Group Meeting
18 Future work Use Project Builder compilation environment coupled with GNU s autotools Integrate Altivec vector pipeline support into math operations Relinquish dependancy on X Create libfb and libdm interface for Aqua Use AquaTk BRL-CAD Users Group Meeting
19 Use Aqua Interface BRL-CAD Users Group Meeting
20 BRL-CAD Users Group Meeting
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