Use the gpu modifier to read the pixel clusters from the unpacker (#31

)

When running the GPU algorithms, the pixel unpacker is reponsible
for providing both the digis and the cluster.
These changes make use of the unpacker label to access the clusters,
conditionally on the presence of the `gpu` process modifier.

DQM/TrackingMonitorSource/python/pixelTracksMonitoring_cff.py

@@ -1,4 +1,5 @@
 import FWCore.ParameterSet.Config as cms
+from Configuration.ProcessModifiers.gpu_cff import gpu
 
 import DQM.TrackingMonitor.TrackerCollisionTrackingMonitor_cfi
 pixelTracksMonitoring = DQM.TrackingMonitor.TrackerCollisionTrackingMonitor_cfi.TrackerCollisionTrackMon.clone()
@@ -21,3 +22,4 @@
 pixelTracksMonitoring.doPlotsVsLUMI             = True
 pixelTracksMonitoring.doPlotsVsBX               = True
 
+gpu.toModify(pixelTracksMonitoring, pixelCluster4lumi = "siPixelDigis")

Validation/RecoTrack/python/TrackValidation_cff.py

@@ -21,6 +21,7 @@
 import RecoTracker.IterativeTracking.iterativeTkConfig as _cfg
 import RecoTracker.IterativeTracking.iterativeTkUtils as _utils
 from Configuration.Eras.Modifier_fastSim_cff import fastSim
+from Configuration.ProcessModifiers.gpu_cff import gpu
 
 ### First define the stuff for the standard validation sequence
 ## Track selectors
@@ -712,6 +713,8 @@ def _uniqueFirstLayers(layerList):
 tpClusterProducerPixelTrackingOnly = tpClusterProducer.clone(
     pixelClusterSrc = "siPixelClustersPreSplitting"
 )
+gpu.toModify(tpClusterProducerPixelTrackingOnly, pixelClusterSrc = "siPixelDigis")
+
 quickTrackAssociatorByHitsPixelTrackingOnly = quickTrackAssociatorByHits.clone(
     cluster2TPSrc = "tpClusterProducerPixelTrackingOnly"
 )