Siemens U3585-J-Z125-8-76 1 manual Basic procedure for ensuring efficient DP system usage

SM2 monitoring program Efficient DP system usage

Because of the volume of data generated, it does not make sense to copy all data record types into the master SM2 output file. SM2U1 can be used to suppress certain data records when updating the master SM2 output file.

To investigate delays when handling special load requirements, you will need further infor- mation in addition to the system utilization data described above. To begin with, the monitoring program PERIODIC-TASK or TASK can be used to select a task. The DISK-FILE monitoring program can be used for overloaded disks to determine the files accessed most frequently. It is not possible to list general guidelines for the additional selection of monitoring programs. For further information, please refer to the “Performance Handbook” [5].

2.13 Basic procedure for ensuring efficient DP system usage

To minimize performance analysis problems, the following procedure should be adhered to:

●Define the performance expectations (see page 25).

●Check the extent to which performance expectations are satisfied once productive operation has begun. This involves carrying out a “basis” test.

●If some performance expectations are not satisfied, check whether these are system- oriented or user-oriented.

●Check for errors in the system setup.

●Carry out a bottleneck analysis (see the section “Automatic performance analysis” in the chapter “SM2R1 analysis routine” and the description of the START-AUTOMATIC- ANALYSIS statement in Volume 2 of the SM2 manual [21]).

Concentrate on those bottlenecks whose elimination promises the greatest perfor- mance improvement.

●After eliminating the detected bottlenecks, repeat the bottleneck analysis. Many bottle- necks remain hidden until after some kind of intervention.

●Monitor the system at regular intervals (see page 27) to detect saturation symptoms in the main resources (due to increasing loads) and to avoid critical system conditions.

The procedure is described in detail in the “Performance Handbook” [5], which also explains how to interpret the results.

U3585-J-Z125-8-76 29