I am experiencing a memory leak that has been shutting down my computer recently. I have been making numerous calls to TTree::Draw to fill TH3 histograms. In order to speed things up, I investigated using ProofLite which in the past I had only used with TSelectors. Speed certainly increased, however, I noticed out of control memory usage that would at times kill my computer. I am attaching a script that replicates what I observe using this version of root:
you can compile with g++ and run twice like so:
The script creates 50 TH3’s with 100x100x50 bins deleting the created histogram right after creation. By adding an argument to the script, proof is not invoked. The script also creates histograms which monitor the memory usage. Attached is a plot showing my observations with and without proof.
Hopefully I am doing something wrong? Or is this a memory leak or fragmentation?
proof_ttree_draw.cxx (2.85 KB)