I have a cross-compiler so I suppose I could do this. Presumably this
would remove the need for the hack since addresses would now be
translated by the VM (though it would be obviously a whole lot slower
than a quick and dirty solution to getting multiple processes
running, one per CPU).
I guess it will not be a huge amount of effort to put my own binaries
on a disk image mounted on the simulated machine?
What I am trying to do is to look at performance of N processes
running on N CPUs vs. those same N processes running sequentially on
a single more aggressive CPU. Not including the OS is obviously a
significant omission but it would be nice to scope the problem with a
simple faster prototype.
The effect of the simple hack of changing the ASID is the simulator
stops pretty quickly claiming it has hit a halt instruction on a
binary which it otherwise executes to completion. Most likely the
problem is that it is not consistently using the ASID "translation".
I'll take a look at building an SMP-capable kernel.
On 10/03/2006, at 2:56 AM, Steve Reinhardt wrote:
Hi Philip,
Philip Machanick wrote:
I would like to model simple multitasking on a multiprocessor
configuration. In
the archive, there is some discussion of the need for a different
ASID for each
process so address spaces don't overlap:
http://sourceforge.net/mailarchive/message.php?msg_id=14328385
We are still in the middle of a major memory system restructuring
that should take care of this problem in v2.0, but that doesn't
help you now. I don't know if the original poster (or anyone else)
has hacked this in to the current version.
plus some discussion of why this hack may not work:
http://sourceforge.net/mailarchive/message.php?msg_id=14066609
I just skimmed this message quickly, but I don't see anything in
there that affects what you want to do (though I may have missed it).
Has there been any progress on this?
(I only want to run SE, not FS, since no doubt we also don't have
an SMP-capable
Alpha Linux.)
It's easy to get an SMP-capable Alpha Linux... if you build a cross-
compiler with crosstools that's all you need to cross-compile a
full kernel and libraries on an x86 machine. No actual Alpha
machines are needed.
Steve
--
Philip Machanick, School of ITEE, University of Queensland
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