Buildfile extensions for APS#

The command sched_aps is used anywhere in the .script section, of your build file, to introduce and define an APS partition, and to configure its budget and critical time. Currently the partition is assumed to be a child of the System partition. name is any valid (15-character) partition name; budget is the total partition budget percentage; and critical is the partition critical time in millisecs (and is optional, defaulting to 0).

     sched_aps name budget [critical]

The attribute [sched_aps=] is used as any other attribute, and sets the APS partition in which to launch the following command (or, if the attribute is used alone on a line without a command, sets the default partition for all following commands). name must have been previously defined as an APS partition.

    [sched_aps=name]

During parsing of the build file, mkxfs will attempt to detect and warn of any APS configuration errors. Errors at boot time, where the APS specification cannot be honoured, will display a warning message but still start the affected commands (in the System partition) and continue with the boot process.

A simple example, which defines a 10% RESERVED partition, into which a shell is started (so all commands executed from that shell will also be in RESERVED) is:

    [+script] .script = {
        sched_aps RESERVED 10
        devc-con -n4 &
        waitfor /dev/con1
        TERM=qansi
        reopen /dev/con4
        [+session pri=35 sched_aps=RESERVED] ksh &
        reopen /dev/con3
        [+session pri=35] ksh &
        reopen /dev/con2
        [+session pri=10] ksh &
        reopen /dev/con1
        [+session pri=10] ksh &
    }

To use the APS scheduller, it must also be configured as a boot. See Building APS