If you are running COBOL user exits compiled with the RES compiler option, make sure that you have enough storage available for the COBOL library subroutines. (This does not apply if the library has been installed resident.)

Besides the minimum DFSORT main storage requirements, you need an additional 1200KB of storage in your REGION to run Language Environment.

Under certain conditions, DFSORT can use all the storage in your REGION below 16MB virtual, thus leaving no room to load the COBOL library subroutines required during processing of your user exit.

Main storage is available above 16MB virtual unless the TMAXLIM or SIZE/MAINSIZE options specify an extremely high value (for example, your system limit for main storage above 16MB virtual). In that case, you can use the ARESALL or ARESINV option to release storage.

During processing, the actual amount of storage required for the COBOL library subroutines depends on the functions performed in the COBOL user exit. You must add a minimum of 20KB to the size of the user exit. If the user exit does I/O, additional storage must be reserved for the I/O buffers. Additional storage for buffers is specified by the m parameter on the MODS statement.

When SIZE/MAINSIZE=MAX is in effect, an alternative way to release storage is to use the RESALL or RESINV option.

• Calling both E15 and E35 user exits
• Running with nonresident library subroutines

This can be done by adding 70KB more to one of the following:

• The m parameter of the MODS statement for the E35 user exit (m = E35 user exit size + 20KB + 70KB)
• The RESALL option when SIZE/MAINSIZE=MAX is in effect.