Apple MA434Z/A User Manual - Page 350
Limits to Shake RAM Usage, The Image Cache, processing cache, Transform, Warp, PinCushion, Twirl
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The processing cache is mainly used to store image tiles (tiles are portions of the complete image) generated by nodes that need surrounding pixels to perform their image processing operations during a render. Example nodes include the Blur, Transform, Warp, PinCushion, and Twirl nodes. The processing cache also provides secondary functionality for caching rendering buffers (in particular for the QuickPaint node that utilizes a full-frame rendering buffer), color look-up tables, and transformation matricies. The global plugs used to control the processing cache are as follows: • cache.cacheMemory • cache.cacheMemoryLimit (Shake version 3.5 and later) Limits to Shake RAM Usage Shake is currently compiled as a 32-bit application, which can theoretically address up to 4 GB of virtual RAM (2^32). However, because of the RAM needs and constraints imposed by the operating system, and competition for RAM from other running applications, most 32-bit applications have a practical limit of approximately 2 GB of addressable RAM per process. Because of this, even if you install 4 GB or more of RAM on your workstation, each Shake process can only take advantage of about 2 GB of that RAM. The good news is that, if you launch a Flipbook while running Shake on a system with 4 GB of RAM, the Flipbook (as a separate process) is able to take advantage of the additional 2 GB of RAM and is less likely to swap to disk, which is slower. Mac OS X v10.3 and above (a 64-bit operating system) running on a PowerPC G5 computer configured with 8 GB of RAM partly addresses this issue. A 32-bit application running natively on a 64-bit OS is still limited to approximately 2 GB of addressable RAM. However, a Macintosh G5 computer configured with 8 GB of RAM running Panther can keep a larger number of applications in physical RAM without swapping out any one application's memory to disk. As a result, Shake is able to allocate larger contiguous segments of physical RAM, allowing large Shake scripts to be edited and rendered in less time. The Image Cache The main purpose of the image cache is to improve interactivity while you're working on a Shake script in the interface. Shake accomplishes this by attempting to output image data from nodes in the compositing tree at, and near, the portion of the compositing tree being edited or viewed. All nodes are capable of having their image data cached. 350 Chapter 13 Image Caching
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