The prototype of UST provider records function entry an return from C and Python code. Requires CPython >= 3.
Available events:
Install dependencies and build:
sudo apt-get install lttng-tools liblttng-ust-dev python3-dev python3-nose libunwind8-dev
python3 setup.py build
sudo python3 setup.py install
from linuxProfile import api api.enable_ust() # do something api.disable_ust()
Events will be recorded to any active LTTng-UST session. (see go.sh for an example of trace management script).
Exceptions are not supported yet. I was not able to trigger PyTrace_EXCEPTION event using "raise" or similar (see nosetests/call_exception.py)
Function name is a start, but the complete namespace should be recorded to avoid ambiguity (such as package.module.class.method). Probably that file and lineno should also be recorded. Suggestions welcome.
Here is an example of the trace for the following foo.py code:
def baz():
pass
def bar():
baz()
def foo():
bar()
if __name__=='__main__':
foo()
lttng create lttng enable-event -u python:call,python:c_call,python:return,python:c_return lttng start python3 -m linuxProfile.ust foo.py lttng stop lttng view
Trace produced:
[17:27:14.772391868] (+?.?????????) berta python:c_call: { cpu_id = 4 }, { co_name = "exec" }
[17:27:14.772405974] (+0.000014106) berta python:call: { cpu_id = 4 }, { co_name = "<module>" }
[17:27:14.772417488] (+0.000011514) berta python:call: { cpu_id = 4 }, { co_name = "foo" }
[17:27:14.772425974] (+0.000008486) berta python:call: { cpu_id = 4 }, { co_name = "bar" }
[17:27:14.772435480] (+0.000009506) berta python:call: { cpu_id = 4 }, { co_name = "baz" }
[17:27:14.772444008] (+0.000008528) berta python:return: { cpu_id = 4 }, { }
[17:27:14.772453087] (+0.000009079) berta python:return: { cpu_id = 4 }, { }
[17:27:14.772461700] (+0.000008613) berta python:return: { cpu_id = 4 }, { }
[17:27:14.772470012] (+0.000008312) berta python:return: { cpu_id = 4 }, { }
[17:27:14.772478886] (+0.000008874) berta python:c_return: { cpu_id = 4 }, { }
[17:27:14.772496402] (+0.000017516) berta python:c_call: { cpu_id = 4 }, { co_name = "disable" }
Source the file env.sh, and then build the project in develop mode:
python3 setup.py develop --install-dir=develop/
The linuxProfile module will be installed as normal user and available for import in Python 3.
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