[Simh] Excessive paging of the real machine running SIMH - VAX

[Villy Madsen]

Richard

Just to confirm my observations....

Does you system settle down after writing a number of bytes that appears to be
closely associated with the total size of your virtual disk ??  - if you have 2
virtual disks - you will find it can also happen (usually does) when the second
disk is mounted...

I have also had cases where it does the same sort of thing at shutdown....

Villy
 

-----Original Message-----
From: simh-bounces at trailing-edge.com [mailto:simh-bounces at trailing-edge.com] On
Behalf Of Richard Davis
Sent: Friday, January 19, 2007 10:21
To: simh at trailing-edge.com
Subject: Re: [Simh] Excessive paging of the real machine running SIMH - VAX

HI.

I've just trawled through the numerous archives and came across this thread
(Sept 2006), it sounds remarkably like the symptoms I'm seeing on my host
machine, it unfortunately makes the whole machine (emulated and host
machine) grind almost to a halt.
Using the 'Windoze task manager' to see what is going on, it seems that SIMH
task goes page fault crazy and is doing a horrendous amount of 'I/O write
bytes', this either occurs just after the VMS "WBM-I-WBMINFO Write Bitmap has
successfully completed initialization." Or immediately the first disk mount
occurs during the VMS startup, occasionally (only VERY occasionally) everything
works just fine and the emulated MicroVax starts up and operates correctly.

Has anyone determined exactly what is going on and any possible
workarounds/fixes?

My host machine is: 3Ghz Pentium4 with hyperthreading enabled, 3Gb RAM running
XP sp2.
My SIMH emulated machine: MicroVax 3900 with 64m memory, a RA72 as system disk
and a "RAUSER=8380080" (RZ29) running VMS 7.1

Thanks
  Richard


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