APSYPAGE parameter

APSYPAGE is obsolete as of 7.6

Summary

Default value

0

Parameter type

System

Where set

On User 0's parameter line

Related products

All

Introduced

Model 204 V5.1

Description

Activates the APSY Precompiled Procedures in Storage feature by specifying a number of 4K operating system pages.

For IBM z/OS systems only.

APSYPAGE was implemented to take advantage of the MVPG machine language instruction which moved an entire hardware page (4K) with a single instruction and which, at the time, had significantly better performance than the stream-oriented moves used by standard APSY load. However, recent hardware models actually seem to have better performance for the stream-oriented moves.

Therefore, it is now recommended that customers who have been using the APSYPAGE parameter disable the APSYPAGE feature by setting APSYPAGE to 0.

Instead of APSYPAGE, you can use either of the following:

• The RESPAGE parameter (recommended for performance). Set RESPAGE to the former value of APSYPAGE. Both RESPAGE and APSYPAGE specify the number of 4096-byte pages allocated for the respective feature.
• The TEMPPAGE parameter. TEMPPAGE pages are bigger so fewer are needed; divide the former APSYPAGE value by 1.5 before adding to TEMPPAGE. TEMPPAGE pages are 6184 bytes, with 6144 used to hold data and 40 bytes as page trailers.