Keywords: tachyon

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## General command line options

Several command line options are available to tune Tachyon performance, display built-in help text, and set output verbosity.

- `-nobounding`: disable automatic generation of hierarchical grid-based acceleration data structures
- `-boundthresh object_count`: override default threshold for subdividing grid cells with a new grid
- `-numthreads thread_count`: command line override for the number of threads to spawn during the ray tracing process. When this options is not specified, Tachyon determines the number of threads to spawn based on the number of CPUs available on a given node.
- `+V`: enable verbose status messages, including reporting of overall node and processor count.
- `-nosave`: disable saving of output images to disk files. This feature is normally only used when benchmarking, or when using one of the OpenGL-enabled Tachyon configurations which provide runtime display of rendered images.
- `-camfile filename`: run a fly-through animation from the named camera file.