Setting Virtual-Processor Parameters with a Text Editor

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Setting Virtual-Processor Parameters with a Text Editor

You can use a text editor program to set ONCONFIG parameters at any time. Use the editor to locate the parameter that you want to change, enter the new value, and rewrite the file to disk.

Table 23 lists the ONCONFIG parameters that are used to configure virtual processors. For more information on how these parameters affect virtual processors, refer to Virtual-Processor Classes.

Table 23. Configuration Parameters for Configuring Virtual Processors
Parameter	Subparameters	Purpose
MULTIPROCESSOR		Specifies that you are running on a multiprocessor computer
NETTYPE		Specifies parameters for network protocol threads (and virtual processors)
SINGLE_CPU_VP		Specifies that you are running a single CPU virtual processor
VPCLASS	adm adt cpu kio lio msc opt lio shm soc str tli	Specifies a class of virtual processors
VPCLASS	num=num_VPs	Specifies the number of virtual processors of the specified class that the database server should start
VPCLASS	max=max_VPs	Specifies the maximum number of virtual processors allowed for a class
VPCLASS	noage	Specifies the disabling of the aging priority
VPCLASS	aff=processor_number aff=`start_range - end_range`	Specifies assignment to CPUs if processor affinity is available
VPCLASS	user_defined	Specifies user-defined virtual processor
VPCLASS	jvp	Specifies Java virtual processor (JVP)
VPCLASS	noyield	Specifies non-yielding virtual processor

Specifying VPCLASS

You should use the VPCLASS parameter instead of the NUMCPUVPS, NUMAIOVPS, NOAGE, AFF_SPROC, and AFF_NPROCS parameters. You can specify a VPCLASS name of up to 128 bytes. The VPCLASS name must begin with a letter or underscore, and must contain letters, digits, underscores, or $ characters.

You specify user-defined classes of virtual processors and Java virtual processors in the VPCLASS configuration parameter. For more information on the VPCLASS configuration parameter, including the defaults and value ranges, see the IBM Informix Dynamic Server Administrator's Reference, User-Defined Classes of Virtual Processors, and Java Virtual Processors.

Disabling Priority Aging (UNIX)

Use the VPCLASS parameter with the noage option to disable process priority aging on platforms that allow this feature.

For recommended values for these database server parameters on UNIX, refer to your machine notes file.