Apple MA434Z/A User Manual - Page 353
diskCache.cacheMemoryLimit, diskCache.cacheSize, through the Time Bar frequently
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The following guidelines apply when setting the diskCache.cacheMemory size: • When editing large node trees in the interface, working at higher bit depths (that is, float), or repeatedly playing back an image sequence, you should consider increasing the diskCache.cacheMemory size to 256 MB, depending on the amount of physical RAM installed in the workstation. • When running Shake on workstations with limited RAM (512 MB, for example) or when running both the Shake interface session and a background render on workstations with 1 GB (or less) of RAM, you should reduce diskCache.cacheMemory to 32 MB. diskCache.cacheMemoryLimit Internally, Shake sets an upper limit of 512 MB on the size of the RAM-based component of the image cache. This global plug allows users to override this limit. However, it is only recommended that you override (increase) this value when working with scripts that have large image resolutions (greater than 2K) and higher bit depths (float) on computers with greater than 2 GB of RAM. Increase at your own risk. diskCache.cacheSize This global plug controls the size of the on-disk component of the image cache. Larger values enable Shake to keep more "high priority" images around that have been pushed out of the RAM-based component of the image cache. Remember that this component of the image cache is inactive during background or command line renders. • Now that workstations routinely have disk drives with hundreds of gigabytes of capacity, it's safe to increase the diskCache.cacheSize to 1 GB or more. This improves interactivity in large scripts, as well as scripts with high bit depth images. • Time Bar playback also results in images being cached to disk. If you scrub or play through the Time Bar frequently, or play long sequences, increasing the diskCache.cacheSize to 1 GB or more allows multiple sequences to reside on disk. • The only reason to reduce diskCache.cacheSize is if a computer has very limited disk space, or the very unlikely scenario that the workstation is using a remote disk mounted over a network as its cache drive-under these circumstances, the latency in retrieving cached images over the network may offset the computational advantages. diskCache.cacheMaxFile This global plug sets the maximum number of files that are stored in the disk-based component of the image cache. Larger values allow Shake to store more images, since each cached image is stored as a separate file. However, some file systems have limits on both the maximum number of open files allowed and the maximum size of those files, so you can use this parameter to reduce the number of files being used in the image cache if a particular system's file limit is being exceeded. Chapter 13 Image Caching 353
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