I recently came across the following:
root.cern.ch/drupal/content/spin … -disk-spin
which I found very interesting, since possibilities to speed up root are always very welcome.
I’d be really interested in using the TTreePerfStats also with a TChain, since this is (at least personally) more often the use case as single trees.
When my chain consists of only 1 file, the CacheSize seems to have the same effect as in the example (I get a very similar plot from the TTreePerfStats).
However as soon as the chain consists of a few files, the CacheSize doesn’t seem to have an effect anymore (see attachement, one has to Zoom in on the x-axis to get a proper picture).
How would I effectively set the CacheSize for the complete TChain?