[rescue] Slightly OT: Problems with simh and macbook
francini at mac.com
Mon Nov 13 11:21:07 CST 2006
The real problem is that most of the emulated OSes don't know that
they're not running on the real hardware, so they are always doing
something, even if it's the "null process" or "null job".
I have the same problem with KLH10, a DEC KL-10 emulator that allows
me to run either TOPS-10 or TOPS-20. That emulator adds a special
'hardware' data movement instruction that, when called, simply puts
the emulated CPU into suspension until a simulated hardware interrupt
occurs (such as I/O completion or a clock interrupt). When that
happens, the emulated CPU is continued.
By poking a call to this instruction into the TOPS-10 or TOPS-20 null
job loop, the emulator's CPU usage drops from 100% of my Mac to less
than 6% if the emulated system is idle.
I haven't played very much with SIMH, so I don't know if it supports
that feature or one like it.
On 13 Nov 2006, at 9:53, Dan Williams wrote:
> I have been runing simh on a Macbook. I am having problems with the
> amount of processor time it takes up. Anyone know of any Unix utils
> that can limit a program l ike this (I tried nice).
> I also remember reading a thread here about usb serial adaptors anyone
> have any recommendations for connecting to Sun/Vaxen machines. I am
> not that familiar with Macs.
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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