GPU multi-threading: Tuned values for number of CPU threads for clusterizer and sector-tracking with TBB

Author: davidrohr

GPU/GPUTracking/Global/GPUChainTracking.cxx

@@ -718,7 +718,7 @@ int32_t GPUChainTracking::RunChain()
   }
 
   if (GetProcessingSettings().autoAdjustHostThreads && !mRec->IsGPU() && mIOPtrs.clustersNative) {
-    mRec->SetNActiveThreads(mIOPtrs.clustersNative->nClustersTotal / 5000);
+    mRec->SetNActiveThreads(mIOPtrs.clustersNative->nClustersTotal / 1500);
   }
 
   if (mIOPtrs.clustersNative && runRecoStep(RecoStep::TPCConversion, &GPUChainTracking::ConvertNativeToClusterData)) {

GPU/GPUTracking/Global/GPUChainTrackingClusterizer.cxx

@@ -577,7 +577,7 @@ int32_t GPUChainTracking::RunTPCClusterizer(bool synchronizeOutput)
     return 1;
   }
   if (GetProcessingSettings().autoAdjustHostThreads && !doGPU) {
-    mRec->SetNActiveThreads(mRec->MemoryScalers()->nTPCdigits / 20000);
+    mRec->SetNActiveThreads(mRec->MemoryScalers()->nTPCdigits / 6000);
   }
 
   mRec->MemoryScalers()->nTPCHits = mRec->MemoryScalers()->NTPCClusters(mRec->MemoryScalers()->nTPCdigits);
@@ -1067,6 +1067,10 @@ int32_t GPUChainTracking::RunTPCClusterizer(bool synchronizeOutput)
     mPipelineNotifyCtx = nullptr;
   }
 
+  if (GetProcessingSettings().autoAdjustHostThreads && !doGPU) {
+    mRec->SetNActiveThreads(-1);
+  }
+
 #endif
   return 0;
 }