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Owning Palette: SMP CPU Utilities VIs

Installed With: RT Module

Sets the number of CPUs in the CPU pools available for automatic load balancing. You can use this VI to define the System pool and the Timed Structures pool by specifying the number of CPUs you want each pool to contain.

This VI creates the System and Timed Structures pools as adjacent pools of contiguous CPUs. The System pool begins at CPU 0 and the Timed Structures pool begins where the System pool ends. For example, on an eight-CPU system, if you wire a value of 3 to both the system pool and timed structures pool controls, this VI assigns CPUs 0-2 to the System pool, CPUs 3-5 to the Timed Structures Pool, and leaves CPUs 6-7 reserved for use by Timed Structures configured for manual CPU assignment.

Note  You cannot use this VI to create empty pools or partially overlapping pools. This VI returns an error if you specify a pool size of 0 or if the pool values you specify add up to more than the number of CPUs available in the system.

Details  

	system pool specifies the number of CPUs to assign to the System pool.
	timed structures pool specifies the number of CPUs to assign to the Timed Structures pool.
	error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use exception control to treat what is normally an error as no error or to treat a warning as an error. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
	assigned CPU pools returns the CPU pool assignments. Reserved The CPU is not assigned to a pool. The CPU is reserved for Timed Structures configured for manual processor assignment. System & Timed Structures The CPU is assigned to both the System pool and the Timed Structures pool for automatic load balancing of all threads that are not manually assigned to a particular CPU. System The CPU is assigned to the System pool for automatic load balancing of non-timed-structure threads. Timed Structures The CPU is assigned to the Timed Structures pool for automatic load balancing of timed structure threads.
	error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

RT Set CPU Pool Sizes Details

The default pool size of -1 sets the size of the pool automatically. If you specify a value of -1 for both pools, this VI creates the default pool configuration in which both pools contain every CPU in the system. If you specify a size of -1 for only one pool, this VI assigns all remaining CPUs to that pool.

Refer to the Specifying the Set of CPUs Available for Automatic Load Balancing topic for more information about CPU pools.