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RAM Cache Size with Disk Caching
The RAM cache and disk cache both use copious amounts of RAM, though in different ways. The size of the RAM cache is controlled by the Max RAM Cache GB preference in the Image Input section. The size of the disk cache is determined by the size of the shot, but the amount of the disk cache in RAM is controlled adaptively by the operating system, depending on the requirements of SynthEyes and other running applications.
If you have the image preprocessor performing extensive processing (especially un- or re-distortion or stabilization), and the shot can fit into RAM, be sure to keep the RAM cache large enough to cache the shot, if possible, so that you avoid repeatedly preprocessing the shot. This is no different than without the disk cache. Though the disk cache helps quickly access the original images, it is important to use the RAM cache to minimize repeated preprocessing.
When the image preprocessor is not being used (ie all controls are at their default settings), then the image supplied by the disk cache will be the same one saved in the RAM cache. Though the image is listed at its normal size on the shot setup panel, in fact it does not take any extra RAM, because the image is already stored in the file on disk. When the image is "stored" in the RAM cache, it occupies less than a hundred bytes regardless of the image resolution.
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