MISER

Description

Specifies whether or not MISER (the IBM Session Manager Network Data Minimizer) should be switched on.

This common session parameter is applicable to these control statements: SYSTEM (see SYSTEM statement), PROFILE (see PROFILE statement), USER (see USER statement), TERMINAL (see TERMINAL statement), and APPL (see APPL statement).

Format

MISER [Yes|No|ON|OFF]|
   [INput]
   [OUTput]
   [REA]
   [ERB]

Default: MISER No

Usage

MISER is essentially a data reduction facility which when enabled can considerably reduce data traffic to and from applications. To achieve this, complex compare techniques are employed to ensure that only those portions of the data stream which have changed are updated, as compared to the data currently appearing on the screen.

It should be noted that there is a CPU overhead in employing these techniques, therefore it is recommended that each Installation examine their own requirements, and experiment with various settings to find the optimum solution. The Q STATS command displays statistics on the volume of data processed. See the Installation and Customization manual for further details.

MISER may be switched on or off, or used selectively by specifying this parameter on appropriate statements. In this way data reduction may be used for those applications or terminals for which it is most effective.

The INPUT, OUTPUT, REA and ERB operands would not usually be specified except when advised by a local support representative. These operands are used if a problem is encountered using MISER and it is necessary to eliminate data reduction for certain areas. These operands can only be positively specified, they cannot be switched off, although any specification completely overrides any previous specification. If MISER=Yes is specified on the SYSTEM statement and MISER=INPUT is specified for a session defined on an APPL statement, for example, then OUTPUT, REA and ERB are effectively turned off for that application. The meanings of these operands are as follows:

Operand

Meaning

INPUT

Restricts data reduction to inbound data streams only.

OUTPUT

Restricts data reduction to outbound data streams only.

REA

Requests the removal of extended attributes.

Note: This operand, although valid, is managed internally, it does not have to be explicitly defined.

ERB

Requests emulation of the Read Buffer command.

When MISER is in force for a session, the queue specified by the WORKQUE parameter is not used because MISER keeps an image of the screen and this is updated.

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