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Performance Improvement Package

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Last updated: Oct 29, 2014 by Bruno Miretti (Deactivated)

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General Description

The CHARON Performance Improvement Package is a collection of the following utilities for VAX/VMS:

  1. IDLE
  2. SHUTDOWN
  3. SHUTDOWN_R
  4. SPEEDUP
  5. SLOWDOWN
  6. SLOWDOWN_R
  7. SLOW_TEST

These utilities are located in the "idle_vms_pkg.vdisk" disk file in the "C:\Program Files (x86)\CHARON\Virtual Disk Images\idle_vms_pkg_v2.0" folder. (Windows x64; for Windows x86 the path is: "C:\Program Files \CHARON\Virtual Disk Images\idle_vms_pkg_v2.0").

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Usage

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

$ MOUNT <device name> /OVERRIDE=IDENTIFICATION

In the root of this disk you will see the following executable files and the COM file designed for the VAX/VMS system running on CHARON-VAX:

UtilityDescription
IDLE.EXE 

Significantly reduces the CHARON-VAX/XX host CPU usage whenever a VAX/VMS system running on CHARON-VAX is idle.

To ensure this is automatically started, you may include a call to the IDLE.EXE in the system startup file.

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

It is not recommended to employ IDLE.EXE in real-time process control environments.

Note: IDLE.EXE cannot be used with the VAX 6xx0 emulators.

IDLE_VMS55.EXEIDLE.EXE version for the VMS 5.5-2 and VMS 5.5-2H4 instances.
SHUTDOWN.EXE

Stops the CHARON-VAX emulator 30 seconds after the utility is invoked. These 30 seconds are intended to be used to shutdown the VAX/VMS system running on CHARON-VAX.

SHUTDOWN3.EXEStops CHARON-VAX 3 minutes after the utility is called.
SHUTDOWN5.EXEStops CHARON-VAX/XX 5 minutes after the utility is called.
SHUTDOWN_R.EXECancels a pending request to SHUTDOWN.
SLOWDOWN.EXE

Slows down the CHARON-VAX execution. Repeated execution further slows down the execution.

SLOWDOWN_R.EXERestores the normal CHARON-VAX/XX execution speed.
SPEEDUP.EXE

Raises CHARON-VAX execution speed by a certain amount of steps.

Only works if SLOWDOWN.EXE has been applied.

SLOW_TEST.COM A test that demonstrates the effect of the CHARON slowdown mechanism.
To run any of these utilities issue the following command: 

 

$ RUN <name of the utility>.EXE

or

$ @<name of the utility>.COM

The SHUTDOWNn.EXE routines do not initiate the shutdown of the VAX/VMS system running on CHARON-VAX, only of the emulator itself.

Establish a VMS shutdown procedure that can complete within the specified time

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