RESPAGE parameter: Difference between revisions
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==Description== | ==Description== | ||
<p> | <p> | ||
This parameter applies to IBM z/OS systems only. It activates the [[Performance monitoring and tuning#Resident Request feature for precompiled procedures|Resident Request feature]] for | This parameter applies to IBM z/OS systems only. It activates the [[Performance monitoring and tuning#Resident Request feature for precompiled procedures|Resident Request feature]] for [[Application_Subsystem_development|APSY]] precompiled procedures in storage. <var>RESPAGE</var> specifies the maximum number of 4K-byte operating system pages to be allocated, above the bar, for procedures that are made resident. </p> | ||
<p> | <p> | ||
Whenever a procedure is made resident, a minimum of 16 4K-byte pages are allocated for that procedure. If more pages are required, another chunk of 16 4K-byte pages is allocated. These chunks facilitate more efficient management of ATB storage, which the operating system allocates in 1-megabyte increments. </p> | Whenever a procedure is made resident, a minimum of 16 4K-byte pages are allocated for that procedure. If more pages are required, another chunk of 16 4K-byte pages is allocated. These chunks facilitate more efficient management of ATB storage, which the operating system allocates in 1-megabyte increments. </p> | ||
Latest revision as of 16:31, 23 May 2017
Number of resident N/QTBL ATB pages
Summary
- Default value
- 0
- Parameter type
- System
- Where set
- User 0 parameter line
- Related products
- All
- Introduced
- Model 204 version 7.5
Description
This parameter applies to IBM z/OS systems only. It activates the Resident Request feature for APSY precompiled procedures in storage. RESPAGE specifies the maximum number of 4K-byte operating system pages to be allocated, above the bar, for procedures that are made resident.
Whenever a procedure is made resident, a minimum of 16 4K-byte pages are allocated for that procedure. If more pages are required, another chunk of 16 4K-byte pages is allocated. These chunks facilitate more efficient management of ATB storage, which the operating system allocates in 1-megabyte increments.
The actual storage "used" by resident requests can be displayed with a MONITOR SUBSYS (PROCCT) subsysname command. Given this allocation algorithm, if you have 1000 procedures that you want to become resident, you will need to set RESPAGE to 16000, at a minimum.
When you specify a non-zero RESPAGE value:
- The actual number of 4K-byte pages allocated is rounded up to the next 1-megabyte page boundary (the next multiple of 256 4K-byte pages).
- Existing settings of RESSIZE, RESLTHR, and RESTHRSH are changed: RESSIZE is reset to -1; RESLTHR and RESTHRSH are reset to zero.
VIEW RESCURR, andVIEW RESHIGHshow, respectively, the current and the high-water mark of ATB storage allocated (even multiples of16*4Kbytes) for resident requests.