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Chapter 4: Conﬁguring Your Pro Tools System 17

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 computers that have multiple processors,

or that feature multi-core processing or hyper-

threading, this setting lets you enable multipro-

cessor support for RTAS plug-ins. Used in com-

bination with the CPU Usage Limit setting, the

RTAS Processors setting lets you control the way

RTAS processing and other Pro Tools tasks are

handled 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 processing

and set a low CPU Usage Limit to leave more

CPU resources available for automation accu-

racy, screen response, 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 Processors and CPU Us-

age Limit settings to achieve the best results.

For example, to improve screen response in a

medium-sized session using a moderate num-

ber of RTAS plug-ins, try reducing the number

of RTAS plug-ins, but keep the CPU Usage Limit

set to the maximum (up to 99% on a single

processor system).

To set the number of RTAS Processors:

1 Choose Setup > Playback Engine.

2 From the RTAS Processing pop-up menu, select

the number of available processors you want to

allocate. The number of processors available var-

ies depending on how many processors are

available on your computer:

• Select 1 Processor to limit RTAS processing

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 number of processors for

RTAS processing.

3 Click OK.

System Usage Window and RTAS Processing

The System Usage window (Windows > System

Usage) displays the combined amount of RTAS

processing occurring on all enabled processors

with a single indicator, regardless of how many

processors are available in the system. If the Sys-

tem Usage Window shows that you are at the

limit of available resources, increase the number

of RTAS processors and adjust the CPU Usage

Limit setting.

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