[Vm-dev] code chart of time inside the VM

[Eliot Miranda]

Hi Ben,

On Sat, Sep 24, 2016 at 6:11 AM, Ben Coman <btc at openinworld.com> wrote:

>
> I was planning to have a go at the issue I logged to make the VM time
> monotonic...
> https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/36
>
> I think its within my capability, but I wanted to get an understanding
> of how time was currently handled cross-platform - so I started
> developing a chart of how the code maps between different platforms
> and within a platform e.g. sqUnixITimerHeartbeat  versus
> sqUnixITimerTickerHeartbeat.
>
> You can see what I was aiming for here...
> http://files.openinworld.com/opensmalltalk-vm/VM-Time/


For me, one really interesting breakdown is the code in terms of what is
the Cog API (all microseconds based) vs the pre-Cog one (milliseconds and
seconds).

The chart is a bit expansive and may be awkward to view in a browser.
> I used yEd to develop it and that provides a nice interface to
> navigate it.
> https://www.yworks.com/products/yed
>
> However one problem is the chart is hard to maintain.  I developed it
> mostly in one sitting and later when I came back to revise it, I found
> it hard to track where I was up to.   The manual process was also a
> bit error  prone.  So my plan now is to use libclang via FFI to parse
> the platform sources together with Roassal to automate producing
> charts from the code.
>
> cheers -ben
>

_,,,^..^,,,_
best, Eliot
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