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a Parallel / Multiprocessor Ray Tracing System.
Revision History: Revision 1.1, Published 2006/10/27 11:17:01 (UTC) by Bernd Kallies Table of Contents
List of Tables Tachyon is a multiprocessor ray tracing system which can be used as a standalone program, or as a library within other programs. It supports almost any Unix-like system, Windows, and MacOS X, as well as several embedded systems and high end supercomputers. Tachyon is written in C, uses POSIX threads and/or MPI for utilization of multiple processors, and can also run on uniprocessor machines. Tachyon is easy to port to new machines, and is fast, using ray tracing acceleration schemes to achieve good performance on very complex scenes. (It will handle scenes containing more than 1,000,000 objects on a fairly average computer) We use Tachyon as default raytracer from within VMD. The current version installed at HLRN is Tachyon 0.97. The installation path is /aws/viz/tachyon-0.97. We provide threaded as well as mpi-parallel executables and libraries in 32bit and 64bit object mode, see Table 1. Support for jpeg and png output was added. Table 1. Tachyon Binaries and Libraries
Invoke tachyon on the command line to see the options. Use the scenes provided in the installation directory for playing The threaded versions use all processors on the current machine by default. To specify the number of parallel threads, use the -numthreads option. For running in batch, set up a serial job, and specify ConsumableCpus matching the number of threads specified by -numthreads. See Running a serial program in The HLRN Quickstart Guide for a general example. See Running programs using poe in The HLRN Quickstart Guide for running MPI applications interactively. See Running an MPI program in The HLRN Quickstart Guide for setting up batch jobs. Select the appropriate library depending on your parallelization scheme, see Table 1. The library libtachyon.a contains objects designed for static linking. The library libtachyon.so contains shared objects designed for run-time linking. Specify the -brtl linker flag when you want to access shared libraries instead of static ones. You may have to specify the location of libjpeg, libpng, and libz, too. Use the versions installed below /class/lib. See http://docserv.hlrn.de:8080/sw/www/offer/berni/Cppc.html for descriptions.
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