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- DefaultKeyFunc(value)
- Keys values in a standard way for grouping in merging and summary.
Merging and summarization can be parameterized by a function that groups
values into equivalence classes. Any function that returns a comparable
object can be used as a key_func, but merge_values and summary both use this
function by default, to allow the default grouping to change as Telemtry does.
Args:
value: A Telemetry Value instance
Returns:
A comparable object used to group values.
- GroupStably(all_values, key_func)
- Groups an array by key_func, with the groups returned in a stable order.
Returns a list of groups.
- MergeLikeValuesFromDifferentPages(all_values, key_func=<function DefaultKeyFunc>)
- Merges values that measure the same thing on different pages.
After using MergeLikeValuesFromSamePage, one still ends up with values from
different pages:
ScalarValue(page1, 'x', 1, 'foo')
ScalarValue(page1, 'y', 30, 'bar')
ScalarValue(page2, 'x', 2, 'foo')
ScalarValue(page2, 'y', 40, 'baz')
This function will group values with the same name and tir_label together:
ListOfScalarValues(None, 'x', [1, 2], 'foo')
ListOfScalarValues(None, 'y', [30], 'bar')
ListOfScalarValues(None, 'y', [40], 'baz')
The workhorse of this code is Value.MergeLikeValuesFromDifferentPages.
Not all values that go into this function will come out: not every value can
be merged across pages. Values whose MergeLikeValuesFromDifferentPages returns
None will be omitted from the results.
This requires (but assumes) that the values passed in with the same name pass
the Value.IsMergableWith test. If this is not obeyed, the results
will be undefined.
- MergeLikeValuesFromSamePage(all_values, key_func=<function DefaultKeyFunc>)
- Merges values that measure the same thing on the same page.
A page may end up being measured multiple times, meaning that we may end up
with something like this:
ScalarValue(page1, 'x', 1, 'foo')
ScalarValue(page2, 'x', 4, 'bar')
ScalarValue(page1, 'x', 2, 'foo')
ScalarValue(page2, 'x', 5, 'baz')
This function will produce:
ListOfScalarValues(page1, 'x', [1, 2], 'foo')
ListOfScalarValues(page2, 'x', [4], 'bar')
ListOfScalarValues(page2, 'x', [5], 'baz')
The workhorse of this code is Value.MergeLikeValuesFromSamePage.
This requires (but assumes) that the values passed in with the same grouping
key pass the Value.IsMergableWith test. If this is not obeyed, the
results will be undefined.
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