Measure Reference Manual

Max Queue Counters (Legacy Style Only)
Max queue counters track the maximum length of a queue. Report format options do not affect
max queue counters.
Due to the sharing of counter records among up to 64 measurement requests, there is no way to
reset max queue values. As records exist in the system longer, the value of max queue counters
diminishes. The reported value becomes irrelevant to the measured period.
In Measure G11 and later PVUs, max queue counters are no longer tracked in the instrumentation.
They are removed from new format records, and are reported as 1 in Legacy Style records and
displays of G11 or later data.
For an example of a max queue counter, see the PROCESS entity counter MAX-MQCS-INUSE
(page 309).
Max Value Counters
Max value counters track the maximum value of a given measurement during the lifetime of the
counter record. Report format options do not affect max value counters.
The only use of a max value counter is MAX-LOCKWAIT-TIME in the DISCOPEN and DISKFILE
records. Units are formatted as ms, sec, hr, day, or wk.
For an example of a max value counter, see the DISCOPEN entity counter MAX-LOCKWAIT-TIME
(page 215).
Queue Counters
Queue counters measure the total amount of time that all queued elements spend on the queue.
Units Displayed As...Output Value Is...Attribute Setting
AQL (average queue length) in
decimal units
Average number of queued elements (AQL)
during the time interval. For queue counters,
REPORT RATE is ON.
RATE ON is not simply an average or
percentage of RATE OFF. RATE ON provides
average queue length, not average time spent
on the queue.
ms, sec, hr, day, or wkTotal amount of time all elements spent on the
queue, expressed in seconds or milliseconds.
REPORT RATE is OFF.
For example, if one process is queued for two
seconds and another process is queued for
three seconds, the total queue time is five
seconds.
Total amount of time all elements spent on the
queue, expressed in microseconds.
REPORT FORMAT is STRUCTURED.
For an example of a queue counter, see the CPU entity counter CPU-QTIME (page 167).
In H-series and J-series RVUs, there are two types of busy counters:
• QUEUE counters, maintained with conventional timers
• TCELLQUEUE counters, maintained with timer cells
For an overview of timer cells and related counters, see Timer Cell Counters (page 143).
140 Entities and Counters