RooFit computation library libRooBatchCompute_AVX2 was loaded before RooFit initialisation began

luminociter · April 22, 2023, 9:25am

I am running a code using a steering macro that does run time compilation. Arguments are passed to the interpreter using the format:

gInterpreter->LoadMacro("Macro_Name.cxx+");

The firt time I run the steering macro root ocmpiles the necessary libraries and runs the code. If I try to re-run int, without replacing the + at the end of the LoadMacro with a ++ (which will force a recompile), I get the following message:

Error in <TRint::HandleTermInput()>: std::logic_error caught: RooFit computation library libRooBatchCompute_AVX2 was loaded before RooFit initialisation began.

jonas · April 23, 2023, 4:53pm

Thank you very much for reporting this!

I have opened a PR to fix this:

github.com/root-project/root

[RF] Don't throw an error if `roobatchcompute` lib was already loaded

root-project:master ← guitargeek:rbc_init

opened 04:50PM - 23 Apr 23 UTC

guitargeek

+2 -4

The `roobatchcompute` library dynamically loads the most performant implementati…on library that the CPU supports. However, it throws an error if the library was already loaded. Indeed, in most usecases it's correct that the implementation library is not loaded before the RooBatchCompute main library is initialized, but if a RooFit script is executed via `gInterpreter->LoadMacro("Macro_Name.cxx++")`, the library is already loaded the second time the macro is launched like this. Hence, it's better is the `batchcompute` library throws no exception if the implementation is already loaded. This fixes a problem reported on the forum: https://root-forum.cern.ch/t/roofit-computation-library-libroobatchcompute-avx2-was-loaded-before-roofit-initialisation-began/54580

This will also be included in the next patch releases for 6.26 and 6.28, which is 6.26.12 and 6.28.04.

Cheers,
Jonas