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Charon IDLE Overview

Charon IDLE is a power save feature. It is supported on HP-UX guest systems and provides an HP-UX service which forces the Charon emulator to release unused CPU cycles to the Linux host. This significantly reduces the Charon-PAR CPU usage in cases where the guest OS is idle or does not requires 100% CPU utilization.

In cloud environments where customer might pay for CPU utilization this will reduce the cost of the Charon-PAR solution.

Charon IDLE Installation on HP-UX

The Charon-PAR kit contains the HP-UX software depot with the Charon IDLE package. Perform the following steps to install it on your HP-UX guest system:

1. Locate the software depot Charon_Idle_0.01.depot in your Charon-PAR kit.
2. Copy the file to the HP-UX guest system (for example using scp or ftp).
3. Log into the HP-UX system as the root user.
4. Install the Charon_IDLE package:
   # swinstall -s /<absolute-path>/Charon_Idle_0.01.depot Charon_Idle
5. Reboot the HP-UX guest system or start the service manually:
   # /sbin/init.d/charon_agent start

You can check if the package is already installed by entering the command: # swlist Charon_Idle.

The Linux host will now show the actual CPU usage of the emulated system instead of always 100% CPU utilization. Please note that the service is started with HP-UX startup. Hence the IDLE service will not be active before booting the system.

Charon IDLE Management and Deinstallation

The following commands can be used to start and stop the service:

Start the Charon IDLE service on HP-UX:

# /sbin/init.d/charon_agent start

Stop the Charon IDLE service on HP-UX:

# /sbin/init.d/charon_agent stop

The following command can be used to deinstall the Charon IDLE service:

# swremove Charon_Idle