True, but the current idling logic in the VAX simulators should detect and be
well behaved under all available versions of VMS as well as when sitting idle
at the console boot rom prompt (>>>).
Sergey suggest that the problem may be related to too large a host OS clock
tick. This turns out not to be the case either.
Priya sent me the following SHOW VERSION output:
MicroVAX 3900 simulator V4.0-0 Beta
Simulator Framework Capabilities:
64b data
64b addresses
Ethernet support
Idle/Throttling support is available
Virtual Hard Disk (VHD) support
RAW disk and CD/DVD ROM support
Asynchronous I/O support
Host Platform:
Compiler: GCC 4.7.2 20121109 (Red Hat 4.7.2-8)
Simulator Compiled: Nov 5 2013 at 15:19:27
Memory Access: Little Endian
Memory Pointer Size: 32 bits
Large File (>2GB) support
OS clock tick size: 2ms
OS: Linux localhost.localdomain 3.6.10-4.fc18.i686.PAE #1 SMP
Tue Dec 11 18:15:08 UTC 2012 i686 i686 i386 GNU/Linux
git commit id: 32b8f063
The OS clock tick size of 2 is the same as on my FC18 test system.
I also received a copy of the config file that is being used.
I responded with the following:
Your vax.ini file doesn't have a "SET CPU IDLE" command. Once that command has
been issued, idle detection may take up to 20 seconds before the running
simulator's clock calibration will allow idling. Normally this 20 seconds
would happen during the boot of the simulated system and not be noticed.
Clearly idling will ONLY be noticed on the host system when the guest system is
actually idling. What operating system (and version) is running on the guest?
How do you know the guest system is actually idle?
We'll see what comes back....
- Mark
From: Hittner, David T (IS) [mailto:[email protected]]
Sent: Friday, January 24, 2014 12:43 PM
To: Mark Pizzolato - Info Comm; Priya Chincholikar; [email protected]
Subject: RE: [Simh] Reduce CPU usage
And what version of VMS are you running? Different versions of VMS have
different idle characteristics..
Dave
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Mark Pizzolato - Info Comm
Sent: Friday, January 24, 2014 8:26 AM
To: Priya Chincholikar; [email protected]<mailto:[email protected]>
Subject: EXT :Re: [Simh] Reduce CPU usage
Hi Priya,
This is one of those "it works for me" cases. Idling works fine for a VMS
guest on my fc18 x86 test system.
What is the output of "SHOW VERSION" done at the "sim>" prompt?
What does your configuration file look like?
- Mark
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Priya Chincholikar
Sent: Friday, January 24, 2014 3:40 AM
To: [email protected]<mailto:[email protected]>
Subject: [Simh] Reduce CPU usage
Hi,
The cpu usage while running the emulator is shown as 97% to 99%. Is there a way
to reduce this?
And I tried setting the cpu idle but no use. CPU utilization is still high.
sim> show cpu
CPU idle disabled, model=VAXServer 3900 (KA655), NOAUTOBOOT
64MB, HALT to console
sim> SET CPU IDLE=VMS
sim> show cpu
CPU idle=VMS, idle enabled, model=VAXServer 3900 (KA655), NOAUTOBOOT
64MB, HALT to console
Host OS used is Linux. fc18.
Thanks,
Priya
_______________________________________________
Simh mailing list
[email protected]
http://mailman.trailing-edge.com/mailman/listinfo/simh
