GPU TPC: increased margins for track-model decoding buffers

Author: cima22

GPU/GPUTracking/DataCompression/GPUTPCDecompression.cxx

@@ -118,9 +118,9 @@ void GPUTPCDecompression::RegisterMemoryAllocation()
 void GPUTPCDecompression::SetMaxData(const GPUTrackingInOutPointers& io)
 {
   uint32_t maxAttachedClsMargin1 = *std::max_element(mInputGPU.nSliceRowClusters, mInputGPU.nSliceRowClusters + mInputGPU.nSliceRows);
-  float clsRatio1 = std::max(mInputGPU.nUnattachedClusters > 0 ? float(mInputGPU.nAttachedClusters) / float(mInputGPU.nUnattachedClusters) : 1.5f, 1.5f); // minimum raio = 1.5
+  float clsRatio1 = (mInputGPU.nUnattachedClusters > 0 ? float(mInputGPU.nAttachedClusters) / float(mInputGPU.nUnattachedClusters) : 1.0f) * 1.5f;
   maxAttachedClsMargin1 *= clsRatio1;
-  uint32_t maxAttachedClsMargin2 = mInputGPU.nAttachedClusters / mInputGPU.nSliceRows * 3;                                               // mean #attached cls per SectorRow multiplied by tuned number 3
+  uint32_t maxAttachedClsMargin2 = mInputGPU.nAttachedClusters / mInputGPU.nSliceRows * 3.5;                                             // mean #attached cls per SectorRow multiplied by 3.5 (tuned)
   mMaxNativeClustersPerBuffer = std::max({maxAttachedClsMargin1, maxAttachedClsMargin2, 1000u});                                         // take biggest margin, 1000 clusters minimum
   mMaxNativeClustersPerBuffer = std::min(mMaxNativeClustersPerBuffer, mRec->GetProcessingSettings().tpcMaxAttachedClustersPerSectorRow); // upperbound given by configurable param
 }