[Vm-dev] New Cog VMs available

[Clément Bera]

Is this problem solved or not ?


On Wed, Apr 27, 2016 at 8:30 PM, Clément Bera <bera.clement at gmail.com>
wrote:

>
>
> 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
>>
>>
>
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