> Snapshot
> --------
>
> ``Snapshot(timestamp: datetime.datetime, traceback_limit: int, stats:
> dict=None, traces: dict=None)`` class:
>
> Snapshot of statistics and traces of memory blocks allocated by
> Python.
>
> ``apply_filters(filters)`` method:
>
> Apply filters on the ``traces`` and ``stats`` dictionaries,
> *filters* is a list of ``Filter`` instances.
Snapshot.apply_filters() currently works in-place. This is not
convinient. It should create a new Snapshot instance.
For example, I have a huge snapshot with +800K traces. I would like to
ignore <unknown> and <frozen importlib._bootrap> filenames: I apply a
first filter to exclude <*>. Then I only want to see allocations
related to the regular expressions: I apply a second pair of filters
to only include */sre*.py and */re.py.
Ok, now I want to see other files. Uh oh, I loose all others traces, I
have to reload the huge snapshot. And again, exclude <*>.
I would prefer something like:
full_snapshot = Snapshot.load("huge.pickle")
clean = full_snapshot.apply_filters([Filter(False, "<*>")])
# delete maybe full_snapshot here
regex = clean.apply_filters([Filter(True, "*/re.py"), Filter(True,
"*/sre*.py")])
other = clean.apply_filters([Filter(False, "*/re.py"), Filter(False,
"*/sre*.py")])
...
> ``Filter(include: bool, filename_pattern: str, lineno: int=None,
> traceback: bool=False)`` class:
> ...
> ``traceback`` attribute:
>
> If *traceback* is ``True``, all frames of the traceback are checked.
> If *traceback* is ``False``, only the most recent frame is checked.
>
> This attribute is ignored if the traceback limit is less than ``2``.
> See the ``get_traceback_limit()`` function.
Hum, I don't really like the traceback name. traceback=False is
confusing because the traceback is used by the filter even if
traceback=False.
Other names: all_frames, any_frame, most_recent_frame_only, ...?
Example:
f1 = Filter("*/linecache.py", all_frames=True)
f2 = Filter("*/linecache.py") # all_frames is False by default
Victor
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