e79753d6b3b01b3e046783998a17e55585183d76
[u/mrichter/AliRoot.git] / ANALYSIS / macros / AODtrain.C
1 // ### Settings that make sense when using the Alien plugin
2 //==============================================================================
3 Int_t       runOnData          = 1;       // Set to 1 if processing real data
4 Int_t       iCollision         = 0;       // 0=pp, 1=Pb-Pb
5 Int_t       run_flag           = 1100;    // year (2011 = 1100)
6 //==============================================================================
7 Bool_t      doCDBconnect        =1;
8 Bool_t      usePhysicsSelection = kTRUE; // use physics selection
9 Bool_t      useTender           = kFALSE; // use tender wagon
10 Bool_t      useCentrality       = kTRUE; // centrality
11 Bool_t      useV0tender         = kFALSE;  // use V0 correction in tender
12 Bool_t      useDBG              = kTRUE;  // activate debugging
13 Bool_t      useMC               = kFALSE;  // use MC info
14 Bool_t      useKFILTER          = kFALSE;  // use Kinematics filter
15 Bool_t      useTR               = kFALSE;  // use track references
16 Bool_t      useCORRFW           = kFALSE; // do not change
17 Bool_t      useAODTAGS          = kFALSE; // use AOD tags
18 Bool_t      useSysInfo          = kFALSE; // use sys info
19
20 // ### Analysis modules to be included. Some may not be yet fully implemented.
21 //==============================================================================
22 Int_t       iAODhandler        = 1;      // Analysis produces an AOD or dAOD's
23 Int_t       iESDfilter         = 1;      // ESD to AOD filter (barrel + muon tracks)
24 Int_t       iESDfilterReVtx    = -1;     // Request revertexing in ESD filtering
25 Int_t       iMUONcopyAOD       = 1;      // Task that copies only muon events in a separate AOD (PWG3)
26 Int_t       iJETAN             = 1;      // Jet analysis (PWG4)
27 Int_t       iJETANdelta        = 1;      // Jet delta AODs
28 Int_t       iPWGHFvertexing     = 1;      // Vertexing HF task (PWG3)
29 Int_t       iPWGDQJPSIfilter    = 0;      // JPSI filtering (PWG3)
30 Int_t       iPWGHFd2h           = 1;      // D0->2 hadrons (PWG3)
31 Int_t       iPWGPP               =1;      // high pt filter task
32 Int_t       iPWGLFForward       = 1;      // Forward mult task (PWGLF)
33 Bool_t doPIDResponse  = 1;
34 Bool_t doPIDqa        = 1; //new
35
36 // ### Configuration macros used for each module
37 //==============================================================================
38  TString configPWGHFd2h = (iCollision==0)?"$ALICE_ROOT/PWGHF/vertexingHF/ConfigVertexingHF.C"
39                           :"$ALICE_ROOT/PWGHF/vertexingHF/ConfigVertexingHF_highmult.C";
40                                                  
41 // Temporaries.
42 void AODmerge();
43 void AddAnalysisTasks();
44 Bool_t LoadCommonLibraries();
45 Bool_t LoadAnalysisLibraries();
46 Bool_t LoadLibrary(const char *);
47 TChain *CreateChain();
48 const char *cdbPath = "raw://";
49 Int_t run_number = 0;
50
51 //______________________________________________________________________________
52 void AODtrain(Int_t merge=0)
53 {
54 // Main analysis train macro.
55
56   if (merge || doCDBconnect) {
57     TGrid::Connect("alien://");
58     if (!gGrid || !gGrid->IsConnected()) {
59       ::Error("QAtrain", "No grid connection");
60       return;
61     }
62   }
63   // Set temporary merging directory to current one
64   gSystem->Setenv("TMPDIR", gSystem->pwd());
65   // Set temporary compilation directory to current one
66   gSystem->SetBuildDir(gSystem->pwd(), kTRUE);
67    printf("==================================================================\n");
68    printf("===========    RUNNING FILTERING TRAIN   ==========\n");
69    printf("==================================================================\n");
70    printf("=  Configuring analysis train for:                               =\n");
71    if (usePhysicsSelection)   printf("=  Physics selection                                                =\n");
72    if (useTender)    printf("=  TENDER                                                        =\n");
73    if (iESDfilter)   {
74      printf("=  ESD filter                                                    =\n");
75      if (iESDfilterReVtx>=0)  printf("=  ESD event revertexed before filterering, algo %2d              =\n",iESDfilterReVtx);
76    }
77    if (iMUONcopyAOD) printf("=  MUON copy AOD                                                 =\n");
78    if (iJETAN)       printf("=  Jet analysis                                                  =\n");
79    if (iJETANdelta)  printf("=     Jet delta AODs                                             =\n");
80    if (iPWGHFvertexing) printf("=  PWGHF vertexing                                                =\n");
81    if (iPWGDQJPSIfilter) printf("=  PWGDQ j/psi filter                                             =\n");
82    if (iPWGHFd2h) printf("=  PWGHF D0->2 hadrons QA                                     =\n");
83
84    // Load common libraries and set include path
85    if (!LoadCommonLibraries()) {
86       ::Error("AnalysisTrain", "Could not load common libraries");
87       return;
88    }
89     
90    // Make the analysis manager and connect event handlers
91    AliAnalysisManager *mgr  = new AliAnalysisManager("Analysis Train", "Production train");
92    if (useSysInfo) mgr->SetNSysInfo(100);
93    // Load analysis specific libraries
94    if (!LoadAnalysisLibraries()) {
95       ::Error("AnalysisTrain", "Could not load analysis libraries");
96       return;
97    }   
98
99    // Create input handler (input container created automatically)
100    // ESD input handler
101    AliESDInputHandler *esdHandler = new AliESDInputHandler();
102    mgr->SetInputEventHandler(esdHandler);       
103    // Monte Carlo handler
104    if (useMC) {
105       AliMCEventHandler* mcHandler = new AliMCEventHandler();
106       mgr->SetMCtruthEventHandler(mcHandler);
107       mcHandler->SetReadTR(useTR); 
108    }   
109    // AOD output container, created automatically when setting an AOD handler
110    if (iAODhandler) {
111       // AOD output handler
112       AliAODHandler* aodHandler   = new AliAODHandler();
113       aodHandler->SetOutputFileName("AliAOD.root");
114       mgr->SetOutputEventHandler(aodHandler);
115    }
116    // Debugging if needed
117    if (useDBG) mgr->SetDebugLevel(3);
118
119    AddAnalysisTasks(cdbPath);
120    if (merge) {
121       AODmerge();
122       mgr->InitAnalysis();
123       mgr->SetGridHandler(new AliAnalysisAlien);
124       mgr->StartAnalysis("gridterminate",0);
125       return;
126    }   
127    // Run the analysis                                                                                                                     
128    //
129    TChain *chain = CreateChain();
130    if (!chain) return;
131                                                                                                                                                    
132    TStopwatch timer;
133    timer.Start();
134    mgr->SetSkipTerminate(kTRUE);
135    if (mgr->InitAnalysis()) {
136       mgr->PrintStatus();
137       mgr->StartAnalysis("local", chain);
138    }
139    timer.Print();
140 }                                                                                                                                          
141                                                                                                                                             
142 //______________________________________________________________________________                                                           
143 void AddAnalysisTasks(const char *cdb_location){                                                                                                                                          
144   // Add all analysis task wagons to the train                                                                                               
145    AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();                                                                     
146
147   //
148   // Tender and supplies. Needs to be called for every event.
149   //
150    AliAnalysisManager::SetCommonFileName("AODQA.root");
151    if (useTender) {
152       gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/TenderSupplies/AddTaskTender.C");
153       // IF V0 tender needed, put kTRUE below
154       AliAnalysisTaskSE *tender = AddTaskTender(useV0tender);
155 //      tender->SetDebugLevel(2);
156    }
157    //
158   // PIDResponse(JENS)
159   //
160   if (doPIDResponse) {
161     gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/macros/AddTaskPIDResponse.C"); 
162     AliAnalysisTaskPIDResponse *PIDResponse = AddTaskPIDResponse();
163 //    PIDResponse->SelectCollisionCandidates(AliVEvent::kAny);
164   }  
165  
166   //
167   // PIDqa(JENS)
168   //
169   if (doPIDqa) {
170     gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/macros/AddTaskPIDqa.C");
171     AliAnalysisTaskPIDqa *PIDQA = AddTaskPIDqa();
172     PIDQA->SelectCollisionCandidates(AliVEvent::kAny);
173   }  
174   // CDB connection
175   //
176   if (doCDBconnect && !useTender) {
177     gROOT->LoadMacro("$ALICE_ROOT/PWGPP/PilotTrain/AddTaskCDBconnect.C");
178     AliTaskCDBconnect *taskCDB = AddTaskCDBconnect(cdb_location, run_number);
179     if (!taskCDB) return;
180     AliCDBManager *cdb = AliCDBManager::Instance();
181     cdb->SetDefaultStorage(cdb_location);
182 //    taskCDB->SetRunNumber(run_number);
183   }    
184  
185    if (usePhysicsSelection) {
186    // Physics selection task
187       gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/macros/AddTaskPhysicsSelection.C");
188       mgr->RegisterExtraFile("event_stat.root");
189       AliPhysicsSelectionTask *physSelTask = AddTaskPhysicsSelection(useMC);
190 //      AliOADBPhysicsSelection * oadbDefaultPbPb = CreateOADBphysicsSelection();      
191 //      physSelTask->GetPhysicsSelection()->SetCustomOADBObjects(oadbDefaultPbPb,0,0);
192       mgr->AddStatisticsTask(AliVEvent::kAny);
193    }
194    
195
196 //Jacek
197    if (iPWGPP) {
198       gROOT->LoadMacro("$ALICE_ROOT/PWGPP/macros/AddTaskFilteredTree.C");
199       AddTaskFilteredTree("FilterEvents_Trees.root");
200    }   
201    
202    // Centrality (only Pb-Pb)
203    if (useCentrality) {
204       gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/macros/AddTaskCentrality.C");
205       AliCentralitySelectionTask *taskCentrality = AddTaskCentrality();
206       //taskCentrality->SelectCollisionCandidates(AliVEvent::kAny);
207    }
208    
209 // --- PWGLF - Forward (cholm@nbi.dk) -----------------------------
210    if (iPWGLFForward && usePhysicsSelection) { 
211         gROOT->LoadMacro("$ALICE_ROOT/PWGLF/FORWARD/analysis2/AddTaskForwardMult.C");
212      UShort_t pwglfForwardSys = 0; // iCollision+1; // pp:1, PbPb:2, pPb:3
213      UShort_t pwglfSNN        = 0;            // GeV, 0==unknown
214      Short_t  pwglfField      = 0;
215      AddTaskForwardMult(useMC && useTR,        // Need track-refs 
216                         pwglfForwardSys,       // Collision system
217                         pwglfSNN, 
218                         pwglfField);
219         gROOT->LoadMacro("$ALICE_ROOT/PWGLF/FORWARD/analysis2/AddTaskCentralMult.C");
220         AddTaskCentralMult(useMC, pwglfForwardSys, pwglfSNN, pwglfField);
221    }
222  
223     
224
225    if (iESDfilter) {
226       //  ESD filter task configuration.
227       gROOT->LoadMacro("$ALICE_ROOT/ANALYSIS/ESDfilter/macros/AddTaskESDFilter.C");
228       AliAnalysisTaskESDfilter *taskesdfilter = 0;
229       if (iMUONcopyAOD) {
230          printf("Registering delta AOD file\n");
231          mgr->RegisterExtraFile("AliAOD.Muons.root");
232          mgr->RegisterExtraFile("AliAOD.Dimuons.root");
233          taskesdfilter = AddTaskESDFilter(useKFILTER, kTRUE, kFALSE, kFALSE /*usePhysicsSelection*/,kFALSE,kTRUE,kFALSE,kFALSE,run_flag);
234       } else {
235         taskesdfilter = AddTaskESDFilter(useKFILTER, kFALSE, kFALSE, kFALSE /*usePhysicsSelection*/,kFALSE,kTRUE,kFALSE,kFALSE,run_flag); // others
236       }   
237       if (iESDfilterReVtx>=0 && taskesdfilter) taskesdfilter->SetRefitVertexTracks(iESDfilterReVtx);
238    }   
239
240 // ********** PWG3 wagons ******************************************************           
241    // PWGHF vertexing
242    if (iPWGHFvertexing) {
243       gROOT->LoadMacro("$ALICE_ROOT/PWGHF/vertexingHF/macros/AddTaskVertexingHF.C");
244       if (!iPWGHFd2h) TFile::Cp(gSystem->ExpandPathName(configPWGHFd2h.Data()), "file:ConfigVertexingHF.C");
245       AliAnalysisTaskSEVertexingHF *taskvertexingHF = AddTaskVertexingHF();
246       if (!taskvertexingHF) ::Warning("AnalysisTrainNew", "AliAnalysisTaskSEVertexingHF cannot run for this train conditions - EXCLUDED");
247       else mgr->RegisterExtraFile("AliAOD.VertexingHF.root");
248       taskvertexingHF->SelectCollisionCandidates(0);
249    }   
250       
251    // PWGDQ JPSI filtering (only pp)
252    if (iPWGDQJPSIfilter && (iCollision==0)) {
253       gROOT->LoadMacro("$ALICE_ROOT/PWGDQ/dielectron/macros/AddTaskJPSIFilter.C");
254       AliAnalysisTaskSE *taskJPSIfilter = AddTaskJPSIFilter();
255       if (!taskJPSIfilter) ::Warning("AnalysisTrainNew", "AliAnalysisTaskDielectronFilter cannot run for this train conditions - EXCLUDED");
256       else mgr->RegisterExtraFile("AliAOD.Dielectron.root");
257       taskJPSIfilter->SelectCollisionCandidates(0);
258    }   
259
260    // PWGHF D2h
261    if (iPWGHFd2h) {   
262      gROOT->LoadMacro("$ALICE_ROOT/PWGHF/vertexingHF/AddD2HTrain.C");
263      TFile::Cp(gSystem->ExpandPathName(configPWGHFd2h.Data()), "file:ConfigVertexingHF.C");
264      AddD2HTrain(kFALSE, 1,0,0,0,0,0,0,0,0,0,0);                                 
265    }
266    
267    // ********** PWG4 wagons ******************************************************
268    // Jet analysis
269
270    // Configurations flags, move up?
271    TString kDeltaAODJetName = "AliAOD.Jets.root"; //
272    Bool_t  kIsPbPb = (iCollision==0)?false:true; // can be more intlligent checking the name of the data set
273    TString kDefaultJetBackgroundBranch = "";
274    TString kJetSubtractBranches = "";
275    UInt_t kHighPtFilterMask = 272;// from esd filter
276    UInt_t iPhysicsSelectionFlag = 0;
277    if (iJETAN) {
278      gROOT->LoadMacro("$ALICE_ROOT/PWGJE/macros/AddTaskJets.C");
279      // Default jet reconstructor running on ESD's
280      AliAnalysisTaskJets *taskjets = AddTaskJets("AOD","UA1",0.4,kHighPtFilterMask,1.,0); // no background subtraction     
281      if (!taskjets) ::Fatal("AnalysisTrainNew", "AliAnalysisTaskJets cannot run for this train conditions - EXCLUDED");
282      if(kDeltaAODJetName.Length()>0) taskjets->SetNonStdOutputFile(kDeltaAODJetName.Data());
283      if (iJETANdelta) {
284         //            AddTaskJetsDelta("AliAOD.Jets.root"); // need to modify this accordingly in the add task jets
285         mgr->RegisterExtraFile(kDeltaAODJetName.Data());
286         TString cTmp("");
287         if(kIsPbPb){
288           // UA1 intrinsic background subtraction
289           taskjets = AddTaskJets("AOD","UA1",0.4,kHighPtFilterMask,1.,2); // background subtraction
290           if(kDeltaAODJetName.Length()>0)taskjets->SetNonStdOutputFile(kDeltaAODJetName.Data());
291        }
292        // SICONE 
293        taskjets = AddTaskJets("AOD","SISCONE",0.4,kHighPtFilterMask,0.15,0); //no background subtration to be done later....                                                                                  
294        if(kDeltaAODJetName.Length()>0)taskjets->SetNonStdOutputFile(kDeltaAODJetName.Data());
295        cTmp = taskjets->GetNonStdBranch();
296        if(cTmp.Length()>0)kJetSubtractBranches += Form("%s ",cTmp.Data());
297          
298        // Add the clusters..
299        gROOT->LoadMacro("$ALICE_ROOT/PWGJE/macros/AddTaskJetCluster.C");
300        AliAnalysisTaskJetCluster *taskCl = 0;
301        Float_t fCenUp = 0;
302        Float_t fCenLo = 0;
303        Float_t fTrackEtaWindow = 0.9;
304        taskCl = AddTaskJetCluster("AOD","",kHighPtFilterMask,iPhysicsSelectionFlag,"KT",0.4,0,1, kDeltaAODJetName.Data(),0.15,fTrackEtaWindow,0); // this one is for the background and random jets, random cones with no skip                                                                                 
305        taskCl->SetBackgroundCalc(kTRUE);
306        taskCl->SetNRandomCones(10);
307        taskCl->SetCentralityCut(fCenLo,fCenUp);
308        taskCl->SetGhostEtamax(fTrackEtaWindow);
309        kDefaultJetBackgroundBranch = Form("%s_%s",AliAODJetEventBackground::StdBranchName(),taskCl->GetJetOutputBranch());
310
311        taskCl = AddTaskJetCluster("AOD","",kHighPtFilterMask,iPhysicsSelectionFlag,"ANTIKT",0.4,2,1,kDeltaAODJetName.Data(),0.15);
312        taskCl->SetCentralityCut(fCenLo,fCenUp);
313        if(kIsPbPb)taskCl->SetBackgroundBranch(kDefaultJetBackgroundBranch.Data());
314        taskCl->SetNRandomCones(10);
315        kJetSubtractBranches += Form("%s ",taskCl->GetJetOutputBranch());
316
317        taskCl = AddTaskJetCluster("AOD","",kHighPtFilterMask,iPhysicsSelectionFlag,"ANTIKT",0.2,0,1,kDeltaAODJetName.Data(),0.15);
318        taskCl->SetCentralityCut(fCenLo,fCenUp);
319        if(kIsPbPb)taskCl->SetBackgroundBranch(kDefaultJetBackgroundBranch.Data());
320        kJetSubtractBranches += Form("%s ",taskCl->GetJetOutputBranch());
321          
322        // DO THE BACKGROUND SUBTRACTION
323        if(kIsPbPb&&kJetSubtractBranches.Length()){
324          gROOT->LoadMacro("$ALICE_ROOT/PWGJE/macros/AddTaskJetBackgroundSubtract.C");
325          AliAnalysisTaskJetBackgroundSubtract *taskSubtract = 0;
326          taskSubtract = AddTaskJetBackgroundSubtract(kJetSubtractBranches,1,"B0","B%d");
327          taskSubtract->SetBackgroundBranch(kDefaultJetBackgroundBranch.Data());
328          if(kDeltaAODJetName.Length()>0)taskSubtract->SetNonStdOutputFile(kDeltaAODJetName.Data());
329        }
330      } 
331    }
332 }
333 //______________________________________________________________________________
334 Bool_t LoadCommonLibraries()
335 {
336 // Load common analysis libraries.
337    if (!gSystem->Getenv("ALICE_ROOT")) {
338       ::Error("AnalysisTrainNew.C::LoadCommonLibraries", "Analysis train requires that analysis libraries are compiled with a local AliRoot"); 
339       return kFALSE;
340    }   
341    Bool_t success = kTRUE;
342    // Load framework classes. Par option ignored here.
343    success &= LoadLibrary("libSTEERBase.so");
344    success &= LoadLibrary("libESD.so");
345    success &= LoadLibrary("libAOD.so");
346    success &= LoadLibrary("libANALYSIS.so");
347    success &= LoadLibrary("libOADB.so");
348    success &= LoadLibrary("libANALYSISalice.so");
349    success &= LoadLibrary("libCORRFW.so");
350    gROOT->ProcessLine(".include $ALICE_ROOT/include");
351    if (success) {
352       ::Info("AnalysisTrainNew.C::LoadCommodLibraries", "Load common libraries:    SUCCESS");
353       ::Info("AnalysisTrainNew.C::LoadCommodLibraries", "Include path for Aclic compilation:\n%s",
354               gSystem->GetIncludePath());
355    } else {           
356       ::Info("AnalysisTrainNew.C::LoadCommodLibraries", "Load common libraries:    FAILED");
357    }   
358    return success;
359 }
360
361 //______________________________________________________________________________
362 Bool_t LoadAnalysisLibraries()
363 {
364 // Load common analysis libraries.
365    if (useTender || doCDBconnect) {
366       if (!LoadLibrary("TENDER") ||
367           !LoadLibrary("TENDERSupplies")) return kFALSE;
368    }       
369    // CDBconnect
370    if (doCDBconnect && !useTender) {
371       if (!LoadLibrary("PWGPP")) return kFALSE;
372    }
373           
374    if (iESDfilter || iPWGMuonTrain) {
375       if (!LoadLibrary("PWGmuon")) return kFALSE;
376    }   
377    // JETAN
378    if (iJETAN) {
379       if (!LoadLibrary("JETAN")) return kFALSE;
380    }
381    if (iJETANdelta) {
382       if (!LoadLibrary("JETAN") ||
383           !LoadLibrary("CGAL") ||
384           !LoadLibrary("fastjet") ||
385           !LoadLibrary("siscone") ||
386           !LoadLibrary("SISConePlugin") ||
387           !LoadLibrary("FASTJETAN")) return kFALSE;
388    }  
389    // PWG2 FORWARD
390    if (iPWGLFForward) {
391       //if (!LoadLibrary("PWGLFforward", mode, kTRUE)) return kFALSE;
392       if (!LoadLibrary("PWGLFforward2")) return kFALSE;
393    }   
394    
395    // PWG3 Vertexing HF
396    if (iPWGHFvertexing || iPWGHFd2h) {
397       if (!LoadLibrary("PWGflowBase") ||
398           !LoadLibrary("PWGflowTasks") ||
399           !LoadLibrary("PWGHFvertexingHF")) return kFALSE;
400    }    
401  //    if (iPWGHFvertexing || iPWG3d2h) {
402  //     if (!LoadLibrary("PWG3base") ||
403  //         !LoadLibrary("PWGHFvertexingHF")) return kFALSE;
404  //  }   
405    // PWG3 dielectron
406    if (iPWGDQJPSIfilter) {
407       if (!LoadLibrary("PWGDQdielectron")) return kFALSE;
408    }   
409    
410    ::Info("AnalysisTrainNew.C::LoadAnalysisLibraries", "Load other libraries:   SUCCESS");
411    return kTRUE;
412 }
413
414 //______________________________________________________________________________
415 Bool_t LoadLibrary(const char *module)
416 {
417 // Load a module library in a given mode. Reports success.
418    Int_t result;
419    TString mod(module);
420    if (!mod.Length()) {
421       ::Error("AnalysisTrainNew.C::LoadLibrary", "Empty module name");
422       return kFALSE;
423    }   
424    // If a library is specified, just load it
425    if (mod.EndsWith(".so")) {
426       mod.Remove(mod.Index(".so"));
427       result = gSystem->Load(mod);
428       if (result < 0) {
429          ::Error("AnalysisTrainNew.C::LoadLibrary", "Could not load library %s", module);
430          return kFALSE;
431       }
432       return kTRUE;
433    } 
434    // Check if the library is already loaded
435    if (strlen(gSystem->GetLibraries(Form("%s.so", module), "", kFALSE)) > 0) return kTRUE;    
436    result = gSystem->Load(Form("lib%s.so", module));
437    if (result < 0) {
438       ::Error("AnalysisTrainNew.C::LoadLibrary", "Could not load module %s", module);
439       return kFALSE;
440    }
441    return kTRUE;
442 }           
443
444
445 //______________________________________________________________________________
446 TChain *CreateChain()
447 {
448 // Create the input chain
449    chain = new TChain("esdTree");
450    if (gSystem->AccessPathName("AliESDs.root")) 
451       ::Error("AnalysisTrainNew.C::CreateChain", "File: AliESDs.root not in ./data dir");
452    else 
453        chain->Add("AliESDs.root");
454    if (chain->GetNtrees()) return chain;
455    return NULL;
456 }   
457
458 //______________________________________________________________________________
459 void AODmerge()
460 {
461 // Merging method. No staging and no terminate phase.
462   TStopwatch timer;
463   timer.Start();
464   TString outputDir = "wn.xml";
465   TString outputFiles = "EventStat_temp.root,AODQA.root,AliAOD.root,AliAOD.VertexingHF.root,FilterEvents_Trees.root,AliAOD.Muons.root,AliAOD.Jets.root";
466   TString mergeExcludes = "";
467   TObjArray *list = outputFiles.Tokenize(",");
468   TIter *iter = new TIter(list);
469   TObjString *str;
470   TString outputFile;
471   Bool_t merged = kTRUE;
472   while((str=(TObjString*)iter->Next())) {
473     outputFile = str->GetString();
474     // Skip already merged outputs
475     if (!gSystem->AccessPathName(outputFile)) {
476        printf("Output file <%s> found. Not merging again.",outputFile.Data());
477        continue;
478     }
479     if (mergeExcludes.Contains(outputFile.Data())) continue;
480     merged = AliAnalysisAlien::MergeOutput(outputFile, outputDir, 10, 0);
481     if (!merged) {
482        printf("ERROR: Cannot merge %s\n", outputFile.Data());
483        continue;
484     }
485   }
486   // all outputs merged, validate
487   ofstream out;
488   out.open("outputs_valid", ios::out);
489   out.close();
490   timer.Print();
491 }