When to use a reusable ASID
Consider the following situations when determining when to use
a reusable ASID:
- If you have an address space that becomes nonreusable when it terminates, as identified by the message IEF352I ADDRESS SPACE UNAVAILABLE at termination, consider using a reusable ASID with it.
- If you have an address space that does not become nonreusable when it terminates, do not use a reusable ASID with it.
To use a reusable ASID, specify REUSASID=YES on the START command
for the address space or specify ATTR=(REUSASID) on the ASCRE.
Note: If
there is a request for a reusable ASID but there are no available
ASIDs that were previously used as reusable ASIDs, z/OS® takes an ASID from the pool of available
ordinary ASIDs to satisfy the request.
If any 0D3 abends then
result from the use of a reusable ASID, investigate and resolve them.Attention: As soon as an ASID is used to satisfy a request
for a reusable ASID, it must always serve as a reusable ASID; you
cannot then use it for a START without REUSASID=YES or an ASCRE without
ATTR=(REUSASID). Unnecessary use of REUSASID=YES or ATTR=(REUSASID)
can reduce the number of ordinary ASIDs that are available for satisfying
ordinary address space requests.