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Proof is a framework to use multiple CPU in the ROOT.
Faster analysis can be done with this extension.
In ideal case, processing time should be reduced by the number of processes, but there are other factors such as disk I/O and memory usage
The optimal choice for the number of jobs seems to be around workers=8, a significant performance drop is observed with large value due to memory consumption.
From the HYU computing node, it took 5min, x4 faster than the single CPUs.