Data Type

Integer

Default Value

0

Description

This parameter binds the I/O thread for FMSDISK to a range of CPU cores. The following options are available:

  • 0, Thread for FMSDISK can run on any CPU core.
  • CPU1:CPU2, Thread for FMSDISK can only run on CPU cores CPU1 through CPU2. CPU cores are numbered starting at 1.
This parameter binds the thread performing I/O to FMSDISK to run on a specified range of CPU cores. On most systems, the I/O is performed by the first processor. Restricting the I/O thread to run on those processing cores can reduce traffic. The form of this command is: 
IOMASK=CPU1:CPU2
where CPU1:CPU2 is the range of CPU cores (starting at 1). For example to bind the FMSDISK thread to CPU cores 1 through 8 you would enter 
IOMASK=1:8
This command should be placed in the license file between the FMSSET and RETURN lines.

This feature works best when hyperthreading is turned off (usually a BIOS setup option).