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Making Frequently Called Programs Resident

A frequently called program (such as ADSOMAIN) is virtually a resident in the program pool or the reentrant pool. The program should be made resident because the operating system can page more rapidly than the DC/UCF system can read in a page from the DDLDCLOD area. By making the program resident, the operating system, rather than the DC/UCF system, will be requested to bring the page in core. Additionally, the program and resident pool will be less fragmented when a frequently used program is made resident. A program can be specified as resident on the PROGRAM statement at system generation.