[Simh] SIMH 3.8-1 IDLE in VMS, interesting CPU usage

[Toby Thain]

On 17-Feb-09, at 2:47 PM, Marc Chametzky wrote:

> I'm setting up an ESXi system into which I'm moving my Solaris server,
> and now setting up some ubuntu JeOS virtual systems

You might want to compare VirtualBox. I recently set up JeOS in  
VirtualBox 2.1.2, went very smoothly.

--Toby

> to host some
> trailing-edge hardware emulations. One nice thing is that I can  
> dedicate
> part of a CPU to the VAX emulator and prioritize it lower, so it can
> spin its wheels appropriately, leaving the overall server available  
> for
> other tasks as needed.
>
> As a test, I turned on IDLE, and I got this very interesting graph:
> http://www.bluevine.net/~marc/CPUidle.jpg
>
> When IDLE is disabled, the CPU usage is a straight line, as it should
> be. I find it quite interesting that with IDLE, it slowly uses more  
> CPU
> until it peaks out at 100% of its allotment, then it drops back  
> down to
> just about 15% and starts climbing again.
>
> Between the two, I prefer the consistency of the straight line, so  
> I'll
> probably disable IDLE again. I just thought this was interesting  
> enough
> to share.
>
> --Marc
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