The optional private area summary section presents information
about how a specific address space is using its private virtual storage.
RMF uses the job name you specify when you request the report to
identify the address space. In choosing a job, note that gathering
data for a specific address space requires additional RMF overhead.
Note that RMF can gather private area data only when a job is active
at the beginning of the interval, and various conditions can limit
RMF's ability to report complete private area data. These conditions,
and the actions RMF takes, are described later in this section under Partial private area data.
In general, RMF can gather meaningful data only for jobs that run
for a relatively long period of time. Note that you cannot monitor
the master scheduler address space.
Note: Measuring virtual storage activity for a specific job may have significant impact on the
performance of the job. When requesting a VSTOR report, system address spaces like CATALOG, VTAM,
Db2, IMS or other, should be specified as jobname only for a short period of time when
diagnosing a special performance situation.
Table 1. Fields in
the Virtual Storage Activity Report - Private Area Summary
Field Heading
Meaning
JOBNAME and PROGRAM NAME
The job analyzed in the report. RMF takes the program name
from the PGM= parameter on the exec statement.
NUMBER OF SAMPLES
The number of samples RMF used to generate the data in the
report. If the job was swapped out at a time when RMF tried to sample
virtual storage data, this number will be less than the number of
samples reported for the common storage summary report.
REGION REQUESTED
The values specified for the REGION= parameter on the JOB or
EXEC JCL statement for the job step or the system default used for
the job step.
REGION ASSIGNED
The region assigned to the job by installation control for
virtual storage below and above the 16-megabyte line. This value limits
the amount of storage that a job can obtain by issuing a variable
length GETMAIN. (When a job issues a variable length GETMAIN, the
amount of storage obtained is the difference between REGION ASSIGNED
and the top of the allocated area, assuming that the largest free
block is there.)