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IDLE Utility

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Oct 13, 2015
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General Description

IDLE utility significantly reduces the CHARON-AXP host CPU usage whenever a OpenVMS system is running on CHARON-AXP is idle.

The utility stalls the emulated CPU when it detects an OpenVMS idle condition. While IDLE utility is running the emulated CPU consumes, on average, less host system CPU time.

(warning) It is not recommended to use the IDLE utility in real-time process control environments.

This set of utilities is located in the "idle_vms_pkg.vdisk" disk file in the "C:\Program Files\CHARON\Virtual Disk Images\idle_vms_pkg_v3.0".

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Installation

Specify this image in the CHARON-AXP configuration file, boot from the system disk and mount the disk with the following OpenVMS command:

$ MOUNT <device name> /OVERRIDE=IDENTIFICATION

In the [.AXP] folder of this disk you will see the following files:
 

 

README.TXT
SRI-AXPVMS-IDLE-V0102–1.PCSI
VMS62TO71U2_PCSI-V0200.PCSI-DCX_AXPEXE
VMS62TO71U2_PCSI-V0200.TXT

If the OpenVMS version is less than 7.1 the following steps must be applied:

  1. Copy the "VMS62TO71U2_PCSI-V0200.PCSI-DCX_AXPEXE" file to some directory on any spare disk and run this file from there:

    $ COPY VMS62TO71U2_PCSI-V0200.PCSI-DCX_AXPEXE SYS$DISK:[000000.TEMP]
    $ SET DEF SYS$DISK:[000000.TEMP]
    $ RUN     VMS62TO71U2_PCSI-V0200.PCSI-DCX_AXPEXE

  2. Install the patch:

    $ PRODUCT INSTALL VMS62TO71U2_PCSI /SOURCE=SYS$DISK:[000000.TEMP]

If the patch has been installed return to the "[000000.AXP]" directory of the "idle_vms_pkg.vdisk" and proceed with installation of the "Idle" utility itself:

$ PRODUCT INSTALL IDLE /SOURCE=<directory containing the IDLE kit>

Once IDLE utility is installed it starts to take effect immediately, reducing the host system CPU usage if OpenVMS system running on CHARON-AXP is idle. No reboot is required.

The utility is loaded automatically on reboot, no additional configuration or startup sequence is needed.

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Deinstallation

Issue the following command to deinstall IDLE utility:

$ PRODUCT REMOVE IDLE

The will utility stop working on next system reboot.

Please also refer to the supplied documents "README.TXT" and "VMS62TO71U2_PCSI-V0200.TXT" for more details.

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