Runtime options
Table 1 lists the new or changed Language Environment® runtime options. For more information, see z/OS Language Environment Customization, z/OS Language Environment Programming Guide, and z/OS Language Environment Programming Reference.
| Runtime option | Release | Description | Reason for change |
|---|---|---|---|
| All runtime options | z/OS® V2R1 | Changed: Runtime
options can no longer be set at the installation level.
|
Support for creating usermods to modify runtime option defaults at the installation level was removed. |
| HEAP64 | z/OS V2R1 | New parameter: The
FILL parameter specifies that an increment to user heap storage is
released when the last of the storage within that increment is freed.
|
Improved allocation of user heap storage for AMODE 64 applications |
| HEAPZONES | z/OS V2R1 | New runtime option: Controls
user heap overlay toleration and checking. When activated, the runtime
option affects any obtained storage that can be controlled by the
HEAP or HEAP64 runtime options.
|
Support of heap zone check toleration and checking |
| PAGEFRAMESIZE | z/OS V2R1 | New runtime option: Allows
users to request storage to be backed by either 4K or 1M pages for
user heap, library heap, I/O heap, and stack for Language Environment
AMODE 64 applications.
|
AMODE 64 support for 1M and 2G large pages |
| PAGEFRAMESIZE64 | z/OS V2R1 | New runtime option: Specifies
the preferred frame size in virtual storage for HEAP64, LIBHEAP64,
IOHEAP64, and STACK64 storage that was obtained during application
initialization and runtime.
|
AMODE 64 support for 1M and 2G large pages |
| USERMODS | z/OS V2R1 | Removed: Use the
CEEPRMxx parmlib member to set the system-default Language Environment
options
|
Usability |