Reduce compile time / memory footprint of DQ

Author: ktf

PWGDQ/Tasks/CMakeLists.txt

@@ -9,6 +9,21 @@
 # granted to it by virtue of its status as an Intergovernmental Organization
 # or submit itself to any jurisdiction.
 
+# tableReader_withAssoc.cxx is 5000 lines of task definitions, and seven
+# workflow variants below #include it verbatim -- differing only in which
+# adaptAnalysisTask<> entries they list, with identical preprocessor state and
+# identical link libraries. Without this it is parsed and instantiated seven
+# times, and it is the heaviest thing in the PWG: a cc1plus compiling one of
+# these was OOM-killed at ~8 GB RSS.
+#
+# Skipped under recc, which caches compilations remotely instead.
+add_library(TableReaderWithAssocPCH OBJECT tableReaderWithAssocPCH.cxx)
+target_link_libraries(TableReaderWithAssocPCH PUBLIC O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore)
+if(NOT DEFINED ENV{USE_RECC})
+  target_precompile_headers(TableReaderWithAssocPCH PRIVATE
+    [["PWGDQ/Tasks/tableReader_withAssoc.cxx"]])
+endif()
+
 o2physics_add_dpl_workflow(table-reader
                     SOURCES tableReader.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2Physics::AnalysisCore O2Physics::PWGDQCore O2Physics::MLCore
@@ -17,36 +32,43 @@ o2physics_add_dpl_workflow(table-reader
 o2physics_add_dpl_workflow(table-reader-with-assoc
                     SOURCES tableReader_withAssoc_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-same-event-pairing-barrel-only
                     SOURCES tableReader_withAssoc_SameEventPairingBarrelOnly_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-same-event-pairing-muon-only
                     SOURCES tableReader_withAssoc_SameEventPairingMuonOnly_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-same-event-pairing
                     SOURCES tableReader_withAssoc_SameEventPairing_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-asymmetric-pairing
                     SOURCES tableReader_withAssoc_AsymmetricPairing_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-dilepton-track-pairing
                     SOURCES tableReader_withAssoc_DileptonTrackPairing_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-dilepton-track-track-pairing
                     SOURCES tableReader_withAssoc_DileptonTrackTrackPairing_workflowSpec.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DetectorsBase O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2Physics::PWGDQCore O2Physics::MLCore
+                    REUSE_FROM TableReaderWithAssocPCH
                     COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(table-reader-with-assoc-direct

PWGDQ/Tasks/tableReaderWithAssocPCH.cxx

@@ -0,0 +1,14 @@
+// Copyright 2019-2026 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+// Carrier for the precompiled header shared by the tableReader_withAssoc
+// workflow variants; see TableReaderWithAssocPCH in this directory's
+// CMakeLists.txt. It exists only to own the PCH.