derek.holloway
7502bf64a4
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1.6 KiB
1.6 KiB
Debug Tracks
Debug Tracks are a way to display tabular results from running a PerfettoSQL
query as a new so-called "debug" track. Specifically, if the resultant table can
be visualised in a slice format (for example, the
slice table), a debug track can be created from
it.
For a result table to be able to be visualised in a slice format, it should include:
- A name (the name of the slice) column.
- A non-null timestamp (the timestamp, in nanoseconds, at the start of the slice) column.
- (Optionally) a duration (the duration, in nanoseconds, of the slice) column.
To create a new debug track:
- Run a SQL query, and ensure its results are
slice-like (as described above).
- Navigate to the Timeline view, and click on "Show debug track" to set up a
new debug track. Note that the names of the columns in the result table do
not necessarily have to be
name,ts, ordur. Columns which semantically match but have a different name can be selected from the drop-down selectors.
- The debug track is visible as a pinned track near the top of the Timeline
view with slices from the table from which the track was created (note that
slices with no/zero duration will be displayed as instant events). The debug
track may be manually unpinned and then it should appear on the top of other
unpinned tracks.
