User Manual

 Load Composition Timeout: This timeout option determines how long the Render
Manger will wait for a composition to load before moving on to another task.
 Last Slave Restart Timeout: This timeout option determines how long the Render
Manager will wait for a render salve to respond before using another render slave.
File I/O
The File I/O options are used to control the performance when reading frames or large media
files from both direct and networked attached storage.
 I/O Canceling: This option enables a feature of the operating system that allows
queued operations to be canceled when the function that requested them is stopped.
This can improve the responsiveness, particularly when loading large images over a
network.
Enabling this option will specifically affect performance while loading and accessing
formats that perform a large amount of seeking, such as the TIFF format.
This option has not been tested with every hardware and OS configuration, so it is
recommended to enable it only after you have thoroughly tested your hardware and OS
configuration using drive loads from both local disks and network shares.
 Enable Direct Reads: Enabling this checkbox uses a more efficient method when
loading a large chunk of contiguous data into memory by reducing I/O operations. Not
every operating system employs this ability, so it may produce unknown behavior.
 Read Ahead Buffers: This slider determines the number of 64K buffers that are use to
read ahead in a file I/O operation. The more buffers, the more efficient loading frames
from disk will be, but the less responsive it will be to changes that require disk access
interactively.
Area Sampling
The Area Sampling options allow you to fine-tune the RAM usage on Render nodes by trading
off speed for lower RAM requirements.
 Automatic Memory Usage: This checkbox determines how area sampling uses
available memory. Area sampling is used for Merges and Transforms. When the
checkbox is enabled (default), Fusion will detect available RAM when processing the
tool and determine the appropriate trade-off between speed and memory.
If less RAM is available, Fusion will use a higher proxy level internally and take longer to
render. The quality of the image is not compromised in any way, just the amount of time
it takes to render. In node trees that deal with images larger than 4K, it may be
desirable to override the automatic scaling and fix the proxy scale manually. This can
preserve RAM for future operations.
 Pre-Calc Proxy Level: Deselecting the Automatic Memory will enable the Pre-Calc
Proxy Scale slider. Higher values will use less RAM but take much longer to render.
Open GL
This section controls how Fusion makes use of your graphics card when compositing in 3D with
the Renderer 3D node. Most settings may be left as they are, but since OpenGL hardware
varies widely in capabilities and different driver revisions can sometimes introduce bugs, these
tweaks can be useful if you are experiencing unwanted behavior.
Chapter – 66 Preferences 1342