[Vm-dev] OS X Mavericks & cog tickers

[Igor Stasenko]

On 25 October 2013 02:05, John McIntosh <johnmci at smalltalkconsulting.com>wrote:

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> On Thu, Oct 24, 2013 at 8:02 PM, Igor Stasenko <siguctua at gmail.com> wrote:
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>> On 25 October 2013 01:43, John McIntosh <johnmci at smalltalkconsulting.com>wrote:
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>>> On Thu, Oct 24, 2013 at 7:38 PM, tim Rowledge <tim at rowledge.org> wrote:
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>>>> On 24-10-2013, at 4:34 PM, Igor Stasenko <siguctua at gmail.com> wrote:
>>>> >
>>>> >
>>>> > (e) Cog uses heartbeat timer to interrupt interpreter at regular time
>>>> periods
>>>> > what can be done, i think it to suppress heartbeat, during
>>>> relinquishProcessorForMicroseconds execution.
>>>> > but that won't buy much, unless we increase the time period to sleep
>>>> to be times larger than heartbeat cycle (both are 1ms).
>>>>
>>>> If I understood, the timer coalescing can push timers around to produce
>>>> spurts of activity followed by quiescence; this results in better overall
>>>> power performance. It *might* cause problems with a high-frequency
>>>> heartbeat.
>>>>
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>>> You pick the "drain my battery real fast" option.... Also in the past
>>> known as "higher performance" to remove the delay in the morphic polling
>>> loop.
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>> yeah, we should get rid of that polling thing and Delay, instead make it
>> wait on semaphore..
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> Morphs have an expectation of being called 50 times a second, you'll need
> to fix that first...
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you mean stepping?
you can signal that semaphore if someone needs to step, as easy as:

[ [stepTime asDelay wait. sema signal ] repeat ] fork

(sure not exactly like above, but you got an idea)

i see no problem here.


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>> P.S. what i missing on BSD systems is good analogy to
>> WaitForMultipleEvents() function which available
>> in Windows kernel. It is far superior to select() and poll().
>> i don't know, if situation is improved in this are since last time i
>> checked.
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>>>>
>>>> tim
>>>> --
>>>> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
>>>> The problem with the gene pool is that there is no lifeguard.
>>>>
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>>> --
>>>
>>> ===========================================================================
>>> John M. McIntosh <johnmci at smalltalkconsulting.com>
>>> Corporate Smalltalk Consulting Ltd. Twitter: squeaker68882
>>>
>>> ===========================================================================
>>>
>>>
>>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko.
>>
>>
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> --
> ===========================================================================
> John M. McIntosh <johnmci at smalltalkconsulting.com>
> Corporate Smalltalk Consulting Ltd. Twitter: squeaker68882
> ===========================================================================
>
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>


-- 
Best regards,
Igor Stasenko.
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