[Vm-dev] New Cog VMs available

[Clément Bera]

On Wed, Apr 27, 2016 at 7:28 PM, Eliot Miranda <eliot.miranda at gmail.com>
wrote:

>
> Hi Clément,
>
> On Wed, Apr 27, 2016 at 7:03 AM, Clément Bera <bera.clement at gmail.com>
> wrote:
>
>>
>> Hi,
>>
>> So after *really* struggling I profiled Holger's code.
>>
>> I put results in attachment with version 3427 and version 3684 of the VM.
>>
>> Holger said the code is not open-source, so if you want more information
>> about the code ask him (or I guess I can answer if it's for a specific
>> method).
>>
>> The code execution is well spread around the methods. It's difficult to
>> conclude.
>>
>> It seems (I say, it seems) that the execution spend more time in recent
>> versions in PICs.
>> It could be that the machine code produced there is different because of:
>> - the abstraction with 32/64 bits
>> - the abstraction over literals for ARM
>> - the design changes, if I understood correctly now PIC are created from
>> a prototype.
>> Now it could be something else.
>>
>> I have no time to investigate further right now. Maybe we should try to
>> generate PICs in 3427 and 3684 and check if the machine code is different.
>> Which VMMaker version is 3427 ?
>>
>> What do you guys think ?
>>
>
> It could be the longer jump in the new PICs, but I really doubt it.  But
> there's something wrong with the VM profiler on linux.  It is not showing
> any code in the interpreter run-time, and that might be hiding the real
> reason.  I'll look at this as soon as I have time, but am committed to
> other things today and tomorrow.
>
> The VM profiler does not show the interpreter run-time in Linux, and does
not work in Mac. I have no windows at hand so I am not able to help then.

Yeah I also doubt that it comes from the PICs. I could be.


> _,,,^..^,,,_
> best, Eliot
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.squeakfoundation.org/pipermail/vm-dev/attachments/20160427/6c7d643f/attachment.htm