SIOSLICE parameter

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Server slice - IO

Summary

Default value
250
Parameter type
System
Where set
On User 0's parameter line or reset by system manager
Related products
All
Introduced
Model 204 V2.1 or earlier

Description

The server real-time slice allotment in milliseconds for non-CPU-bound users

This parameter controls the time a non-CPU-bound user is allowed to remain in a server area without performing any terminal I/O. It is used primarily when a lower priority user in a server is denied CPU time because of higher priority, CPU-bound users. The latter type might be waiting for a server and might be of sufficient priority to be run in a server.

Decreasing SIOSLICE might generate increased server I/O, but it offers better service to higher priority users when there are few servers or when Model 204 is being run on a heavily overloaded system. Increasing this parameter can lower server I/O, but at the same time it diminishes the response differential between low and high priority users. SIOSLICE must not be set to less than twice the value of IOSLICE.