Add a method to print the disk profile of an ntuple#22914
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Shows cluster groups, clusters, column ranges and pages. Comes with a test which stress tests the method with an ntuple shuffled on the 3 uppermost layers of the hierarchy: cluster groups, clusters, column ranges (pages are by definition uninterrupted serialized blobs).
Adds the ntuple header, footer and page list to the method. Updates its unit test accordingly.
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This Pull request:
Changes or fixes:
Adds
PrintDiskProfilemethod to the experimentalRNTupleInspectorclass.Its brief:
In order to implement it I've added free function
GetAnchorinto theROOT::Internalnamespace, friend to theRPageSourceFileclass. OtherwiseRNTupleInspectorhas no access to it's anchor, which is necessary to visualize an ntuple's header and footer.Comes with a unit test.
Right now only supports Speedscope, with the following results for the test ntuple:
Checklist:
This PR fixes # (nothing, it's a new feature)