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Chapter 5: Conﬁguring Your Pro Tools System 19

RTAS Processors

The RTAS Processors setting determines the

number of processors in your computer allo-

cated for RTAS (Real-Time AudioSuite) plug-in

processing.

With multiprocessor computers, this setting lets

you manage multi-processor support for RTAS

processing. With multiple processor computers

that support Hyper-Threading (and have it en-

abled), you must disable Hyper-Threading for

this setting to become available. See your com-

puter’s documentation for steps on how to enter

the computer’s BIOS and disable Hyper-Thread-

ing.

Used in combination with the CPU Usage Limit

setting, the RTAS Processors setting lets you con-

trol the way RTAS processing and other

Pro Tools tasks are carried out by the system. For

example:

• For sessions with large numbers of RTAS plug-

ins, you can allocate 2 or more processors to

RTAS processing and set a high CPU Usage

Limit.

• For sessions with few RTAS plug-ins, you can

allocate fewer processors to RTAS and set a low

CPU Usage Limit to leave more CPU resources

available for automation accuracy, screen re-

sponse, and video.

• Depending on the importance of video and

overall screen response, and on the density of

automation being employed, try different

combinations of RTAS Processing and CPU

Usage Limit settings to achieve the best re-

sults. For example, to improve screen re-

sponse in a medium-sized session using a

moderate number of RTAS plug-ins, try reduc-

ing the number of RTAS plug-ins, but keep the

CPU Usage Limit set to its maximum on a sin-

gle processor system.

To set the number of RTAS Processors:

1 Choose Setup > Playback Engine.

2 From the RTAS Processors pop-up menu, select

the number of available processors you want to

allocate for RTAS plug-in processing. The num-

ber of processors available varies depending on

how many processors are available on your

computer:

• Choose 1 Processor to limit RTAS process-

ing to one CPU in the system.

• Choose 2 Processors to enable load balanc-

ing across two available processors.

• On systems running four or more proces-

sors, choose the desired number of RTAS

processors as needed.

3 Click OK.

CPU Usage Limit

The CPU Usage Limit controls the percentage of

CPU resources allocated to Pro Tools host pro-

cessing tasks. Used in combination with the

RTAS Processors setting, the CPU Usage Limit

setting lets you control the way Pro Tools tasks

are carried out by the system.

 Lower CPU Usage Limit settings limit the ef-

fect of Pro Tools processing on other CPU-inten-

sive tasks, such as screen redraws, and are useful

when you are experiencing slow system re-

sponse, or when running other applications at

the same time as Pro Tools.

 Higher CPU Usage Limit settings allocate

more processing power to Pro Tools, and are

useful for playing back large sessions or using

more real-time plug-ins.

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