Interpreting loader statistics

"Average loading time" = "Total loading time" / "Number of library load requests". This indicates the response time overhead suffered by tasks when accessing a program which has to be brought into storage. If "Average loading time" has increased over a period, consider MVS™ library lookaside usage. "Not-in-use" program storage is freed progressively so that the "Amount of the dynamic storage area occupied by not in use programs", and the free storage in the dynamic storage area are optimized for performance. Loader attempts to keep not-in-use programs in storage long enough to reduce the performance overhead of reloading the program. As the amount of free storage in the dynamic storage decreases, the not-in-use programs are freemained in order of those least frequently used to avoid a potential short-on-storage condition.

Note:
The values reported are for the instant at which the statistics are gathered and vary since the last report.

"Average Not-In-Use queue membership time" = "Total Not-In-Use queue membership time" / "Number of programs removed by compression". This is an indication of how long a program is left in storage when not in use before being removed by the dynamic program storage compression (DPSC) mechanism. If the interval between uses of a program, that is, interval time divided by the number of times used in the interval, is less than this value, there is a high probability that the program is in storage already when it is next required.

Note:
This factor is meaningful only if there has been a substantial degree of loader domain activity during the interval and may be distorted by startup usage patterns.

"Average suspend time" = "Total waiting time" / "Number of waited loader requests".

This is an indication of the response time impact which may be suffered by a task due to contention for loader domain resources.

Note:
This calculation is not performed on requests that are currently waiting.

For more information, see the CICS® statistics tables in topic Loader domain statistics.

Related reference
Back to full list of statistics
Interpreting CICS statistics
Full listing and DFHSTUP reports for these statistics
Loader domain statistics
DFH0STAT reports for these statistics
Loader and Program Storage Report
[[ Contents Previous Page | Next Page Index ]]