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[RF] Parallelize per-channel workspace creation in MakeModelAndMeasurementsFast #18683
Description
Explain what you would like to see improved and how.
Add an option to MakeModelAndMeasurementsFast to create the per-channel workspaces in parallel.
Right now, a for-loop over all channels is done and a workspace for each channel is created sequentially. This is usually fast.
However, in my case, to create a single channel workspace takes about 2 min (already with disabled file creation). This is still not much. However, my analysis has O(200) channels. Therefore, these 2 min per workspace stack to multiple hours.
If instead, multiple per-channel workspaces could be created in parallel, the runtime could be drastically reduced.
ROOT version
ROOT 6.37.01 from heads/master@v6-37-01-6587-gc7b62f1e9c
Installation method
Build from source
Operating system
AlmaLinux 9
Additional context
No response
Activity
[-]Parallelize per-channel workspace creation in MakeModelAndMeasurementsFast[/-][+][RF] Parallelize per-channel workspace creation in MakeModelAndMeasurementsFast[/+]guitargeek commentedon Aug 25, 2026
Addressed with a performance optimization that prevents the original bad performance scaling, so we don't need to parallelize:
[RF] Skip cloning recycled nodes in RooWorkspace::import()
[RF] Skip cloning recycled nodes in RooWorkspace::import()
[RF] Skip cloning recycled nodes in RooWorkspace::import()