Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Programming Guide

Preloading library routines

The PL/I library contains one RMODE 24 routine that is used for low-level system i/o functions: IBMPOIOA. If your code does RECORD i/o or uses SYSPRINT as a STREAM OUTPUT file (without compiling with the STDSYS option), then you will significantly improve your performance if you preload this routine or put it into the (E)LPA.


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