ASVT sampler
The ASVT sampler produces a warning message if the percentage of slots on any of the three queues is less than the specified threshold value.
When programs that establish PCs terminate, the address space ID is not reusable until all address spaces that had established a cross-system bind with the address space terminate. When this situation occurs, a slot is taken off of the Non-reusable Replacement Queue to maintain the MAXUSER value.
After the Non-reusable Replacement Queue is depleted, the maximum number of address spaces (number on the available queue plus the number active) is decreased each time an address space becomes not-reusable. Eventually, the Available Queue might be depleted, preventing the start of additional address spaces. The only exception is that Started Tasks can be initiated as long as the Start/SASI Queue is not depleted.
Depletion of these queues might force a system IPL. Therefore, monitoring the queues might give you an opportunity to take corrective action to avoid an IPL.
Syntax
The parameters are defined as follows:
Parameter | Description |
|---|---|
int | is the length of the report period in intervals; the default is 30 seconds (one interval) |
avq | is the threshold percentage for the Available Queue A warning message is displayed when the number of slots on the Available Queue, taken as a percentage of the original number, is less than the specified threshold value. |
rplq | is the threshold percentage for the Non-reusable Replacement Queue A warning message is displayed when the number of slots on the Non-reusable Replacement Queue, taken as a percentage of the original number, is less than the specified threshold value. |
strtq | is the threshold percentage for the Start/SASI Queue A warning message is displayed when the number of slots on the Start/SASI Queue, taken as a percentage of the original number, is less than the specified threshold value. |
Example
ASVT,4,20,50,80
The reporting period is four intervals (two minutes if the default interval is used). A warning message will be issued if one of the following occurs:
- Available Queue is less than 20% of the USERMAX value.
- Non-reusable Replacement Queue is less than 50% of the RSVNONR value.
- Start/SASI Queue is less than 80% of the RSVSTRT value specified when an IPL was performed on the system.
Warning message
The following warning messages are issued by the ASVT sampler:
PWSASVT1 *WARNING* Available Queue is xxx% of MAXUSER
Message PWSASVT1 is issued when result of the following equation exceeds the AVQ (Available Queue) percentage specified for the ASVT sampler in your BBPARM member PWSCPMxx:
(total-slots-available/slots-in-use) x 100PWSASVT2 *WARNING* Non-Reusable Replacement Queue is xxx % of RSVNONR
Message PWSASVT2 is issued when the result of the following equation exceeds the RPLQ (Non-reusable Replacement Queue) percentage specified for the ASVT sampler in your BBPARM member PWSCPMxx:
(reserved-slots-available / remaining-reserved-slots) x 100PWSASVT3 *WARNING* START/SASI queue is xxx % of RSVSTRT
Message PWSASVT3 is issued when the result of the following equation exceeds the STRTQ (STC Reserved Queue) percentage specified for the ASVT sampler in your BBPARM member PWSCPMxx:
(reserved-STC-slots / remaining-STC-slots) x 100
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