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Tell ROOT how many thread to use #33038

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merged 1 commit into from Mar 3, 2021
Merged

Tell ROOT how many thread to use #33038

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5 changes: 4 additions & 1 deletion FWCore/Services/plugins/InitRootHandlers.cc
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Expand Up @@ -21,6 +21,7 @@
#include "tbb/concurrent_unordered_set.h"
#include "tbb/task.h"
#include "tbb/task_scheduler_observer.h"
#include "tbb/global_control.h"
#include <memory>

#include <thread>
Expand Down Expand Up @@ -830,7 +831,9 @@ namespace edm {
// Enable Root implicit multi-threading
bool imt = pset.getUntrackedParameter<bool>("EnableIMT");
if (imt && not ROOT::IsImplicitMTEnabled()) {
ROOT::EnableImplicitMT();
//cmsRun uses global_control to set the number of allowed threads to use
// we need to tell ROOT the same value in order to avoid unnecessary warnings
ROOT::EnableImplicitMT(tbb::global_control::active_value(tbb::global_control::max_allowed_parallelism));
}
}

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