[Simh] FW: trouble with idle detection on VAX (Thomas Pfau)

[Broer van Smeden]

Dear Bob,
Yesreday I'v read the site of personal alfa. For AXP, the VMS engineering
have a special VMS patch for signalling idle state to an emulator.
See next quote
CPU usage

PersonalAlpha claims its host CPU for 100% since there is in principle no
way to tell whether the Alpha Operating System needs the CPU or not. On a
single CPU system like a laptop this will affect the other applications that
run on the Windows system and it may drain your batteries.
For the production quality emulator VirtualAlpha this will be no problem
since one of the 2 host CPU's should be dedicated for Alpha Hardware
Virtualization only. PersonalAlpha however will most likely run on a single
CPU system. In cooperation with OpenVMS engineering we have created a
mechanism that allows VMS to inform PersonalAlpha that it is idleing and
that it can let go of the CPU for a while. This function is embedded in
PersonalAlpha already, you only need to install the appropriate utility in
OpenVMS. For that purpose the PersonalAlpha package includes an OpenVMS disk
with this software that you can add to your OpenVMS environment via the
regular installation process:

    * add the idleloop.vdisk disk image to PersonalAlpha as DKA100 using the
Configuration window
    * start PersonalAlpha
    * mount DKA100 ( $ mount DKA100/over=id )
    * change the directory to DKA100 ( $ set default DKA100:[v11] )
    * install the software ( $ product install * )

After this procedure the CPU-idle package is installed on your OpenVMS boot
disk (please note that you have to repeat this process when you are using
more than 1 OpenVMS boot disk with for example different release versions).
The CPU-idle program is automatically started when you boot the system from
this OpenVMS boot disk.



Kind regards

Broer



-----Oorspronkelijk bericht-----
Van: simh-bounces at trailing-edge.com [mailto:simh-bounces at trailing-edge.com]
Namens Kay Dekker
Verzonden: Thursday 14 June 2007 18:32
Aan: simh at trailing-edge.com
Onderwerp: Re: [Simh] trouble with idle detection on VAX (Thomas Pfau)

Bob wrote:
> Yes,  idle is broken completely, and will require extensive surgery 
> before it can work.  Don't use it.

Does that apply only to the VAX emulation, or to the PDP10 also?

Kay






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