[Vm-dev] Stack VMs with primitives for AndreasSystemProfiler?

[Juan Vuletich (mail lists)]

:D

Quoting "David T. Lewis" <lewis at mail.msen.com>:

>
> On Wed, Feb 27, 2013 at 11:12:48PM -0300, Juan Vuletich wrote:
>>
>> Let me explain my problem.
>>
>
> https://www.youtube.com/watch?v=uDUdoQY3GYc
>
> ;-)
>
> Dave
>
>> Tim's recent feedback on performance in Raspberry PI made me want to go do
>> some profiling on a slow machine. The slowest machine I have at hand is a
>> Thinkpad T23, Pentium III, 1.1GHz. I use a program called "Cpukiller3",
>> that can slow it down to (for example) Raspi performance levels. Besides,
>> I integrated AndreasSystemProfiler in Cuis, and I prefer using it. Now I
>> need a suitable Windows VM:
>> - CogVM: Can't run on the P-III, as it doesn't include SSE2 instructions.
>> - StackVM: Not currently built by you. I don't know if it would require
>> SSE2, anyway.
>> - InterpreterVM a.k.a. ClosureVM. Currently doesn't include the new
>> profiling primitives. Will include them, eventually. Right now, this is
>> what I'm using, limited to less precise MessageTally. It is also what I've
>> been using for several years to look for code to optimize in Cuis.
>>
>> Additionally, wrt Cog, on 2013/1/23 you wrote:
>> "That said there are still limitations with primitives and Cog.  Currently
>> Cog only samples "interpreter" primitives.  Those primitives it implements
>> in machine code (integer and float arithmetic, closure evaluation, at:,
>> identityHash) are not sampled and won't show up; they will be charged to
>> the calling method.".
>> I'm not sure if this is a real issue. And I don't know if this limitation
>> applies to StackVM or InterpreterVM. Can you please clarify?
>>
>> Another option would be some software for that can slow down an Atom or
>> Core processor in a reliable and predictable way, and just use Cog. So
>> far, I couldn't find any. Suggestions welcome!
>>
>> Finally, I could take the dust off my XO (300MHz Geode processor) and do
>> profiling there. It is already slow enough, and can run Cog.
>>
>



Cheers,
Juan Vuletich