Add optional debug info to ophydobj with inspect #961
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@klauer, @prjemian, @danielballan, @tacaswell, what are your thoughts about it? I remember we discussed something along these lines with Ken long time ago, but I forgot where, and what was the result. |
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A few thoughts:
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If we can solve this from the outside, like with It’s possible that |
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I created a demo repository to test this feature: https://github.com/mrakitin/profile_inspect_ophyd_pr961. The
This is addressed via e7d08b6, good suggestion, Ken!
It does slow things down. You could check the timing report at the bottom of the https://github.com/mrakitin/profile_inspect_ophyd_pr961#with-ophyd_debug_with_inspect1 section. Posting it here for quicker access: # Without OPHYD_DEBUG_WITH_INSPECT=1
In [1]: durations
Out[1]:
{'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/00-base.py': 0.565570912000112,
'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/01-devices.py': 0.0007143089997043717}
# With OPHYD_DEBUG_WITH_INSPECT=1
In [1]: durations
Out[1]:
{'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/00-base.py': 42.23476164300064,
'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/01-devices.py': 0.009821958999964409}So, we have a ~40s overhead in this simple case, therefore I prefer to have this feature optional, and disabled by default.
Please check https://github.com/mrakitin/profile_inspect_ophyd_pr961#to-address-questions-about-edit-and-obj-ipython-magics. Unfortunately, the magic commands do not work for the objects defined in the profile startup files. |
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40+ seconds?! Wow... I wonder if it's related to adding this information onto every ophyd areadetector class and such. |
Good suggestion! It indeed speeds it up quite a bit: In [1]: durations
Out[1]:
{'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/00-base.py': 0.665280208000695,
'/home/vagrant/.ipython/profile_inspect_ophyd_pr961/startup/01-devices.py': 0.006712106000122731} |
ophyd/ophydobj.py
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| from .log import control_layer_logger | |||
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| OPHYD_DEBUG_WITH_INSPECT = os.getenv('OPHYD_DEBUG_WITH_INSPECT') | |||
| if OPHYD_DEBUG_WITH_INSPECT: | |||
| import inspect | |||
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Small standard-library import - I'd say include it in the normal import block above.
You might consider something like this to avoid confusion about how to enable it:
os.environ.get("...", "") in ("y", "yes", "1")
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Good idea, I'll add a better check soon.
ophyd/ophydobj.py
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| from .log import control_layer_logger | |||
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| OPHYD_DEBUG_WITH_INSPECT = os.getenv('OPHYD_DEBUG_WITH_INSPECT') | |||
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Do you imagine this being the only thing we'll want to observe more closely in a "slow" debug build?
If not, we'll probably end up renaming this later- the naming is very specific to this one case.
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Good point, @ZLLentz! We may have other use-cases for inspect, so I think naming it as OPHYD_DISCOVER_CLASSES_SOURCE (or something similar) will reflect the purpose of the environment variable. I probably also need to add it to the documentation 🤔.
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Alternatively, going the other direction and making it OPHYD_DEBUG could make it easier to switch on/off general debugging tools. I think @ZLLentz may have been pointing that way.
I am looking for a quick way to extract the information from what file an ophyd object was instantiated, and where its source code is. It can be done with
inspect.stack(). It causes performance issues within__init__subclass__, so I decided to make it optional, enabled via an environment variableOPHYD_DEBUG_WITH_INSPECT. That can be useful for debugging.Usage: