[Python-Dev] Making the new dtrace support work on OS X

[Lukasz Langa]

Looks like function-entry and function-return give you the C-level frame names for some reason. This was implemented on OS X 10.11 if that makes any difference. I will look at this in the evening, the laptop I'm on now is macOS Sierra with SIP which cripples dtrace.

> On Jan 12, 2017, at 5:08 AM, David Cournapeau <cournape at gmail.com> wrote:
> 
> Hi,
> 
> I was excited to see official dtrace support for python 3.6.0 on OS X, but I have not been able to make it work:
> 
> 1. I built my own python from sources on OS X 10.9,  with the --with-dtrace support
> 2. if I launch `python3.6 -q &` and then `sudo dtrace -l -P python$!`, I get the following output:
> 
>    ID   PROVIDER            MODULE                          FUNCTION NAME
>  2774 python48084         python3.6          _PyEval_EvalFrameDefault function-entry
>  2775 python48084         python3.6          _PyEval_EvalFrameDefault function-return
>  2776 python48084         python3.6                           collect gc-done
>  2777 python48084         python3.6                           collect gc-start
>  2778 python48084         python3.6          _PyEval_EvalFrameDefault line
> 
> Which looks similar but not the same as the example given in the doc at https://docs.python.org/dev/howto/instrumentation.html#enabling-the-static-markers <https://docs.python.org/dev/howto/instrumentation.html#enabling-the-static-markers>
> 
> 3. When I try to test anything with the given call_stack.d example, I can't make it work at all:
> 
> """
> # script.py
> def start():
>     foo()
> 
> def foo():
>     pass
> 
> start()
> """
> 
> I am not very familiar with dtrace, so maybe I a missing a step, there is a documentation bug, or it depends on which OS X version you are using ?
> 
> Thanks,
> David
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