QMF consists of several load modules. The main module (about 2.8 MB) can run in 31-bit mode above 16 MB and can be located in the extended pageable link pack area (EPLPA). A small support module (about 52 KB) must be run in 24-bit mode below 16 MB. This module can reside in the pageable link pack area (PLPA). By using EPLPA and PLPA, each OS/390 region executing QMF can share QMF programs.
Each QMF region requires at least 1.5 MB of virtual storage. Additional storage generally provides improved performance, because QMF can keep more data records in virtual storage.
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