PLB_ISI_CACHE Keyword

PLBWIN, or PLBLinux, 9.6

PLB_ISI_CACHE={cachesize}

This keyword controls ISI sector caching by the runtime. ISI caching improves application performance by reducing operating system IO when reading the ISI tree structure repeatedly. By default, the ISI caching is turned on and the default ISI cache sector count is 50% of the maximum sectors allowed. The {cachesize} defines the default cache size for every IFILE that is opened in a PLB program.

Where:

{cachesize}

This parameter must be specified from zero (0) to two hundred (200).

 

To disable ISI caching, use one of the following:

• Place 'PLB_ISI_CACHE=0' in the [Environment] section of the runtime INI file

• Use the 'SETMODE *ISICACHE=0' instruction.

• Use the 'ISICACHE=0' keyword in an IFILE OPEN or PREP instruction.

Note:

1. The ISI caching is only enabled and disabled in the OPEN or PREP instructions for an IFILE variable.

Examples:

PLB_ISI_CACHE=20

See Also: PLBWIN Keywords, PLBLinux Environment Variables, Compiler and Runtime Options