Siemens SM2 monitoring system manual Category Queue report SM2 reports, Task category

CATEGORY QUEUE report SM2 reports

CATEGORY QUEUE report

The PRIOR task scheduler uses three criteria for controlling main memory and CPU utilization by the tasks. These criteria are

–the task category,

–the multiprogramming level, and

–the task priority.

Detailed information on these criteria can be found in the manuals "Introductory Guide to Systems Support" [6] and “Performance Handbook” [5]. In the following, only information that is relevant for the SM2 reports is discussed.

Task category

In BS2000, 16 task categories are distinguished at present, i.e. the 4 standard categories

–SYS (internal tasks and remote batch processing)

–DIALOG (interactive mode)

–BATCH (batch mode)

–TP (inquiry-and-transaction mode)

and up to 12 categories that can be defined freely by the system administrator.

Multiprogramming level

The multiprogramming level denotes the number of tasks of a given category that may use main memory concurrently, i.e. the number of active tasks of a category.

In the /MODIFY-TASK-CATEGORIES command the system administrator uses the category attributes

MIN MPL

MAX MPL

WEIGHT

to specify the relative priority of each category in order to make decisions regarding activation (= allocation of authorization to use main memory).

MIN MPL is used to specify a minimum number of active tasks of a category. The system tries to reach the specified MIN MPL value first.

MAX MPL is used when there is no fixed limit, i.e. activation continues even after the maximum MPL value as long as no resource bottleneck occurs.

WEIGHT is used to control the sequence of activation.

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