ENH: have MUST_READ_IF_MODIFIED on IOdictionary construction

TODO

@@ -1,100 +1,23 @@
-- allocate/free tags.
+- check 
-Not tested.
+    new fvMesh
-
+    new fvMeshSubset
-OK - test blockMesh with cyclics
+for consistency with createMesh.H
-unitTestCases/singleCyclic/
+
-
+
-OK - test cyclics sequential running.
+
-unitTestCases/singleCyclic/
+- Check the following:
-
+
-OK - test decomposePar
+doc/changes/inotify.txt
-tested channel395
+ 
-
+
-OK - FaceCellWave
+
-    unitTestCases/twoCavityCyclicForWallDistance/
+
-
+
-OK - non-parallel finite volume : channelFoam
+
-    unitTestCases/channel395-splitCyclic vs. channel395-dev
+
-
+
-OK - parallel finite volume with processorCyclic: channelFoam
+
-    unitTestCases/channel395-splitCyclic vs. channel395-dev
+
-
-OK - preProcessing/foamUpgradeCyclics
-
-OK - gamg - sequential.
-Tested on channel395-splitCyclic with GAMG.
-OK - gamg parallel.
-Tested on channel395-splitCyclic with GAMG.
-
-- initTransfer in GAMGprocessorInterfaces using nonblocking+tags
-untested.
-
-OK - cyclic baffles.
-Tested on t-junction-with-fan
-
-OK. - jumpCyclics/fanFvPatchField. All usages of jump() now need to account
-for being owner() or not.
-Tested on t-junction-with-fan.
-
-OK - regionSplit
-tested on singleCyclic
-
-OK - pointFields on cyclics. volPointInterpolation.
-tested on channel395-splitCyclic
-
-OK - fvMeshSubset
-tested on singleCyclic
-
-OK - pointEdgeWave (maybe test through inversePointDistanceDiffusivity?)
-tested on twoCavityCyclicForWallDistance
-
-OK - scotchDecomp
-tested with testCalcCSR on twoCavityCyclicForWallDistance
-
-NOT WORKING - fvMeshDistribute to split cyclic patches into ones
-  with different separation.
-tested on singleCyclic
-
-OK - test createPatch pointSync
-note: only works if face-centre position of 0th faces is ok since uses
-this for separation. Should in fact make cyclic planar using patch centre and
-normal?
-test on twoCavityCyclicForWallDistance with point (0 1 0) set to (0 1.001 0)
-
-NO PROBLEM - renumberMesh
-It doesn't do renumbering through cyclics.
-
-OK - rotational cyclics.
-Tested on movingCone-with-cyclics
-
-OK - LUscalarMatrix::convert still expects interfaces to be cyclic
-tested on channel395 with 'directSolveCoarsest true;' 
-
-OK - grep for size()/2
-
-- all tutorials with cyclics:
-    OK - incompressible/DNS/dnsFoam/boxTurb16
-    OK - incompressible/channelFoam/channel395
-    slight differences due to divergence. combustion/XiFoam/les/pitzDaily3D
-    OK - no cyclics. combustion/fireFoam/les/smallPoolFire2D
-    discreteMethods/dsmcFoam/freeSpacePeriodic
-    discreteMethods/dsmcFoam/wedge15Ma5
-    discreteMethods/molecularDynamics/mdEquilibrationFoam/periodicCubeArgon
-    OK - incompressible/boundaryFoam/boundaryLaunderSharma
-    OK - incompressible/boundaryFoam/boundaryWallFunctions
-    OK - incompressible/boundaryFoam/boundaryWallFunctionsProfile
-    OK - needs createBaffles. incompressible/pimpleFoam/t-junction-with-fan
-    OK - incompressible/simpleSRFFoam/mixer
-    OK - needs createBaffles. lagrangian/porousExplicitSourceReactingParcelFoam/filter
-    needs special coupledbcs. lagrangian/reactingParcelFilmFoam/multipleBoxes
 
 
-OK - createBaffles
 
-- have foamUpgradeCyclics split 'value' field
-- activeBaffleVelocity
-- kivaToFoam/readKivaGrid.H sorts cyclics (but in incorrect order?)
-- isoSurface.C
-- referredCellList.C
-- work out scheduled communication?
-OK - add neighbourPatch checking to 16x.

applications/solvers/DNS/dnsFoam/readTransportProperties.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/DNS/dnsFoam/readTurbulenceProperties.H

@@ -7,7 +7,7 @@
             "turbulenceProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/basic/laplacianFoam/createFields.H

@@ -23,7 +23,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/basic/scalarTransportFoam/createFields.H

@@ -39,7 +39,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/SCOPEXiEq/SCOPEXiEq.C

@@ -62,7 +62,7 @@ Foam::XiEqModels::SCOPEXiEq::SCOPEXiEq
                 "combustionProperties",
                 Su.mesh().time().constant(),
                 Su.mesh(),
-                IOobject::MUST_READ
+                IOobject::MUST_READ_IF_MODIFIED
             )
         ),
         thermo

applications/solvers/combustion/PDRFoam/createFields.H

@@ -110,7 +110,7 @@
             "PDRProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/combustion/PDRFoam/readCombustionProperties.H

@@ -7,7 +7,7 @@
             "combustionProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/combustion/XiFoam/readCombustionProperties.H

@@ -7,7 +7,7 @@
             "combustionProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/combustion/dieselEngineFoam/readCombustionProperties.H

@@ -7,7 +7,7 @@ IOdictionary combustionProperties
         "combustionProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/solvers/combustion/fireFoam/createFields.H

@@ -65,7 +65,7 @@ IOdictionary combustionProperties
         "combustionProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/solvers/combustion/reactingFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/combustion/rhoReactingFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/compressible/rhoCentralFoam/readThermophysicalProperties.H

@@ -9,7 +9,7 @@ IOdictionary thermophysicalProperties
         "thermophysicalProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/solvers/compressible/rhoSonicFoam/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/compressible/rhopSonicFoam/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/compressible/sonicDyMFoam/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/compressible/sonicDyMFoam/readTransportProperties.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/compressible/sonicLiquidFoam/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/compressible/sonicLiquidFoam/readTransportProperties.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/discreteMethods/molecularDynamics/mdEquilibrationFoam/readmdEquilibrationDict.H

@@ -7,7 +7,7 @@ IOdictionary mdEquilibrationDict
         "mdEquilibrationDict",
         runTime.system(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/solvers/electromagnetics/electrostaticFoam/createFields.H

@@ -7,7 +7,7 @@
             "physicalProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/electromagnetics/magneticFoam/createFields.H

@@ -21,7 +21,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/electromagnetics/mhdFoam/createFields.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/financial/financialFoam/createFields.H

@@ -7,7 +7,7 @@
             "financialProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/heatTransfer/chtMultiRegionFoam/regionProperties/regionProperties.C

@@ -36,7 +36,7 @@ Foam::regionProperties::regionProperties(const Time& runTime)
             "regionProperties",
             runTime.time().constant(),
             runTime.db(),
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     ),

applications/solvers/incompressible/boundaryFoam/createFields.H

@@ -44,7 +44,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/incompressible/channelFoam/readTransportProperties.H

@@ -6,7 +6,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/solvers/incompressible/icoFoam/createFields.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/incompressible/shallowWaterFoam/readGravitationalAcceleration.H

@@ -7,7 +7,7 @@ IOdictionary gravitationalProperties
         "gravitationalProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/solvers/lagrangian/coalChemistryFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/lagrangian/incompressibleUncoupledKinematicParcelFoam/createFields.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/lagrangian/porousExplicitSourceReactingParcelFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/lagrangian/reactingParcelFilmFoam/createFields.H

@@ -97,7 +97,7 @@
             "additionalControls",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/lagrangian/reactingParcelFilmFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/lagrangian/reactingParcelFoam/readChemistryProperties.H

@@ -7,7 +7,7 @@ IOdictionary chemistryProperties
         "chemistryProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE,
         false
     )

applications/solvers/multiphase/bubbleFoam/createFields.H

@@ -91,7 +91,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/multiphase/bubbleFoam/createRASTurbulence.H

@@ -5,7 +5,7 @@
             "RASProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/multiphase/cavitatingFoam/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/multiphase/interPhaseChangeFoam/phaseChangeTwoPhaseMixtures/phaseChangeTwoPhaseMixture/phaseChangeTwoPhaseMixtureNew.C

@@ -46,7 +46,7 @@ Foam::phaseChangeTwoPhaseMixture::New
                 "transportProperties",
                 U.time().constant(),
                 U.db(),
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )

applications/solvers/multiphase/settlingFoam/createFields.H

@@ -50,7 +50,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );
@@ -184,7 +184,7 @@
             "RASProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/multiphase/twoPhaseEulerFoam/createFields.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );
@@ -153,7 +153,7 @@
             "interfacialProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/multiphase/twoPhaseEulerFoam/kineticTheoryModels/kineticTheoryModel/kineticTheoryModel.C

@@ -56,7 +56,7 @@ Foam::kineticTheoryModel::kineticTheoryModel
             "kineticTheoryProperties",
             Ua_.time().constant(),
             Ua_.mesh(),
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     ),

applications/solvers/multiphase/twoPhaseEulerFoam/readPPProperties.H

@@ -5,7 +5,7 @@
             "ppProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/stressAnalysis/solidDisplacementFoam/readMechanicalProperties.H

@@ -7,7 +7,7 @@
             "mechanicalProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/solvers/stressAnalysis/solidDisplacementFoam/readThermalProperties.H

@@ -7,7 +7,7 @@
             "thermalProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/test/LduMatrix/createFields.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/test/dataEntry/testDataEntry.C

@@ -48,7 +48,7 @@ int main(int argc, char *argv[])
             "dataEntryProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/test/fvSolutionCombine/fvSolutionCombine.C

@@ -116,7 +116,7 @@ int main(int argc, char *argv[])
             dictName,
             "system",
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/utilities/errorEstimation/estimateScalarError/estimateScalarError.C

@@ -57,7 +57,7 @@ int main(int argc, char *argv[])
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/errorEstimation/icoErrorEstimate/icoErrorEstimate.C

@@ -56,7 +56,7 @@ int main(int argc, char *argv[])
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/errorEstimation/icoMomentError/icoMomentError.C

@@ -57,7 +57,7 @@ int main(int argc, char *argv[])
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/errorEstimation/momentScalarError/momentScalarError.C

@@ -58,7 +58,7 @@ int main(int argc, char *argv[])
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/advanced/autoRefineMesh/autoRefineMesh.C

@@ -639,7 +639,7 @@ int main(int argc, char *argv[])
         "motionProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     );
 
@@ -669,7 +669,7 @@ int main(int argc, char *argv[])
             "autoRefineMeshDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/advanced/combinePatchFaces/combinePatchFaces.C

@@ -74,7 +74,7 @@ void checkSnapMesh
             "snapMeshDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/advanced/modifyMesh/modifyMesh.C

@@ -346,7 +346,7 @@ int main(int argc, char *argv[])
             "modifyMeshDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/advanced/selectCells/edgeStats.C

@@ -78,7 +78,7 @@ Foam::edgeStats::edgeStats(const polyMesh& mesh)
         "motionProperties",
         mesh.time().constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     );
 

applications/utilities/mesh/advanced/selectCells/selectCells.C

@@ -346,7 +346,7 @@ int main(int argc, char *argv[])
             "selectCellsDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/conversion/foamToStarMesh/getTimeIndex.H

@@ -29,7 +29,7 @@
                     runTime.timeName(),
                     "uniform",
                     runTime,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE,
                     false
                 )

applications/utilities/mesh/conversion/foamToSurface/getTimeIndex.H

@@ -29,7 +29,7 @@
                     runTime.timeName(),
                     "uniform",
                     runTime,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE,
                     false
                 )

applications/utilities/mesh/generation/blockMesh/blockMeshApp.C

@@ -121,7 +121,7 @@ int main(int argc, char *argv[])
                   : dictPath
                 ),
                 runTime,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )
@@ -137,7 +137,7 @@ int main(int argc, char *argv[])
                 runTime.constant(),
                 polyMeshDir,
                 runTime,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )

applications/utilities/mesh/generation/extrudeMesh/extrudeMesh.C

@@ -218,7 +218,7 @@ int main(int argc, char *argv[])
             runTimeExtruded.constant(),
             regionDir,
             runTimeExtruded,
-            IOobject::MUST_READ
+            IOobject::MUST_READ_IF_MODIFIED
         )
     );
 

applications/utilities/mesh/generation/snappyHexMesh/snappyHexMesh.C

@@ -144,7 +144,7 @@ int main(int argc, char *argv[])
             "decomposeParDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );
@@ -157,7 +157,7 @@ int main(int argc, char *argv[])
             "snappyHexMeshDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
        )
     );

applications/utilities/mesh/manipulation/createPatch/createPatch.C

@@ -532,7 +532,7 @@ int main(int argc, char *argv[])
               : word::null
             ),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/utilities/mesh/manipulation/mirrorMesh/mirrorFvMesh.C

@@ -39,7 +39,7 @@ Foam::mirrorFvMesh::mirrorFvMesh(const IOobject& io)
             "mirrorMeshDict",
             time().system(),
             *this,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     ),

applications/utilities/mesh/manipulation/mirrorMesh/readMirrorDict.H

@@ -7,7 +7,7 @@
             "mirrorMeshDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/mesh/manipulation/refineMesh/refineMesh.C

@@ -334,7 +334,7 @@ int main(int argc, char *argv[])
                 "refineMeshDict",
                 runTime.system(),
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );

applications/utilities/mesh/manipulation/renumberMesh/renumberMesh.C

@@ -483,7 +483,7 @@ int main(int argc, char *argv[])
                 "decomposeParDict",
                 runTime.system(),
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );

applications/utilities/mesh/manipulation/stitchMesh/stitchMesh.C

@@ -298,7 +298,7 @@ int main(int argc, char *argv[])
                 args.options()["toleranceDict"],
                 runTime.constant(),
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );

applications/utilities/mesh/manipulation/topoSet/topoSet.C

@@ -83,7 +83,7 @@ int main(int argc, char *argv[])
             (
                 dictPath,
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
           : IOobject
@@ -91,7 +91,7 @@ int main(int argc, char *argv[])
                 dictName,
                 runTime.system(),
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         ) 

applications/utilities/parallelProcessing/decomposePar/decomposePar.C

@@ -163,7 +163,7 @@ int main(int argc, char *argv[])
                 runTime.time().system(),
                 regionDir,          // use region if non-standard
                 runTime,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )

applications/utilities/parallelProcessing/decomposePar/domainDecomposition.C

@@ -94,7 +94,7 @@ Foam::domainDecomposition::domainDecomposition(const IOobject& io)
             "decomposeParDict",
             time().system(),
             *this,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     ),

applications/utilities/parallelProcessing/redistributeMeshPar/redistributeMeshPar.C

@@ -581,7 +581,7 @@ int main(int argc, char *argv[])
             "decomposeParDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/postProcessing/dataConversion/foamDataToFluent/foamDataToFluent.C

@@ -94,7 +94,7 @@ int main(int argc, char *argv[])
                 "foamDataToFluentDict",
                 runTime.system(),
                 mesh,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );

applications/utilities/postProcessing/dataConversion/foamToEnsightParts/getTimeIndex.H

@@ -26,7 +26,7 @@
 
         if (io.headerOk())
         {
-            io.readOpt() = IOobject::MUST_READ;
+            io.readOpt() = IOobject::MUST_READ_IF_MODIFIED;
             IOdictionary timeObject(io);
 
             timeObject.lookup("index") >> timeIndex;

applications/utilities/postProcessing/dataConversion/foamToGMV/readConversionProperties.H

@@ -5,7 +5,7 @@ IOdictionary conversionProperties
         "conversionProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/utilities/postProcessing/graphics/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3Foam.C

@@ -444,7 +444,7 @@ void Foam::vtkPV3Foam::updateFoamMesh()
                 meshRegion_,
                 dbPtr_().timeName(),
                 dbPtr_(),
-                IOobject::MUST_READ
+                IOobject::MUST_READ_IF_MODIFIED
             )
         );
 

applications/utilities/postProcessing/graphics/PV3Readers/PV3blockMeshReader/vtkPV3blockMesh/vtkPV3blockMesh.C

@@ -315,7 +315,7 @@ void Foam::vtkPV3blockMesh::updateFoamMesh()
                 dbPtr_().constant(),
                 polyMesh::meshSubDir,
                 dbPtr_(),
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )

applications/utilities/postProcessing/graphics/fieldview9Reader/readerDatabase.C

@@ -260,7 +260,7 @@ void Foam::readerDatabase::loadMesh()
     meshPtr_ = new fvMeshSubset
     (
         *runTimePtr_,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::AUTO_WRITE
     );
 

applications/utilities/postProcessing/lagrangian/particleTracks/createFields.H

@@ -5,7 +5,7 @@ IOdictionary propsDict
         "particleTrackProperties",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ
+        IOobject::MUST_READ_IF_MODIFIED
     )
 );
 

applications/utilities/postProcessing/miscellaneous/execFlowFunctionObjects/execFlowFunctionObjects.C

@@ -62,7 +62,7 @@ namespace Foam
                     args["dict"],
                     runTime.system(),
                     runTime,
-                    IOobject::MUST_READ
+                    IOobject::MUST_READ_IF_MODIFIED
                 )
             );
 
@@ -130,7 +130,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "RASProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         );
@@ -140,7 +140,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "LESProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         );
@@ -184,7 +184,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
                     "transportProperties",
                     runTime.constant(),
                     mesh,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE
                 )
             );
@@ -214,7 +214,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "RASProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         );
@@ -224,7 +224,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "LESProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         );
@@ -266,7 +266,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
                     "transportProperties",
                     runTime.constant(),
                     mesh,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE
                 )
             );

applications/utilities/postProcessing/miscellaneous/pdfPlot/createFields.H

@@ -5,7 +5,7 @@
             "pdfDict",
             runTime.constant(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/postProcessing/miscellaneous/postChannel/postChannel.C

@@ -69,7 +69,7 @@ int main(int argc, char *argv[])
             "postChannelDict",
             mesh.time().constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/postProcessing/miscellaneous/postChannel/readTransportProperties.H

@@ -7,7 +7,7 @@
             "transportProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/postProcessing/velocityField/Mach/Mach.C

@@ -98,7 +98,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
                     "thermodynamicProperties",
                     runTime.constant(),
                     mesh,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE
                 )
             );

applications/utilities/postProcessing/velocityField/Mach/readThermodynamicProperties.H

@@ -7,7 +7,7 @@
             "thermodynamicProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/postProcessing/velocityField/Pe/Pe.C

@@ -81,7 +81,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "RASProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         );
 
@@ -90,7 +90,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
             "LESProperties",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         );
 
@@ -174,7 +174,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
                         "transportProperties",
                         runTime.constant(),
                         mesh,
-                        IOobject::MUST_READ,
+                        IOobject::MUST_READ_IF_MODIFIED,
                         IOobject::NO_WRITE
                     )
                 );
@@ -299,7 +299,7 @@ void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
                         "transportProperties",
                         runTime.constant(),
                         mesh,
-                        IOobject::MUST_READ,
+                        IOobject::MUST_READ_IF_MODIFIED,
                         IOobject::NO_WRITE
                     )
                 );

applications/utilities/preProcessing/boxTurb/readBoxTurbDict.H

@@ -7,7 +7,7 @@
             "boxTurbDict",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/preProcessing/changeDictionary/changeDictionary.C

@@ -292,7 +292,7 @@ int main(int argc, char *argv[])
             "changeDictionaryDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );
@@ -405,7 +405,7 @@ int main(int argc, char *argv[])
                     fieldName,
                     instance,
                     mesh,
-                    IOobject::MUST_READ,
+                    IOobject::MUST_READ_IF_MODIFIED,
                     IOobject::NO_WRITE,
                     false
                 )

applications/utilities/preProcessing/dsmcInitialise/dsmcInitialise.C

@@ -50,7 +50,7 @@ int main(int argc, char *argv[])
             "dsmcInitialiseDict",
             mesh.time().system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/preProcessing/engineSwirl/createFields.H

@@ -7,7 +7,7 @@ IOdictionary engineGeometry
         "engineGeometry",
         runTime.constant(),
         mesh,
-        IOobject::MUST_READ,
+        IOobject::MUST_READ_IF_MODIFIED,
         IOobject::NO_WRITE
     )
 );

applications/utilities/preProcessing/foamUpgradeCyclics/foamUpgradeCyclics.C

@@ -279,7 +279,7 @@ void rewriteField
             fieldName,
             runTime.timeName(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/utilities/preProcessing/foamUpgradeFvSolution/foamUpgradeFvSolution.C

@@ -70,7 +70,7 @@ int main(int argc, char *argv[])
             "fvSolution",
             runTime.system(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/utilities/preProcessing/mapFields/mapFields.C

@@ -291,7 +291,7 @@ int main(int argc, char *argv[])
                 "mapFieldsDict",
                 runTimeTarget.system(),
                 runTimeTarget,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE,
                 false
             )
@@ -310,7 +310,7 @@ int main(int argc, char *argv[])
                 "decomposeParDict",
                 runTimeSource.system(),
                 runTimeSource,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );
@@ -375,7 +375,7 @@ int main(int argc, char *argv[])
                 "decomposeParDict",
                 runTimeTarget.system(),
                 runTimeTarget,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );
@@ -446,7 +446,7 @@ int main(int argc, char *argv[])
                 "decomposeParDict",
                 runTimeSource.system(),
                 runTimeSource,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );
@@ -464,7 +464,7 @@ int main(int argc, char *argv[])
                 "decomposeParDict",
                 runTimeTarget.system(),
                 runTimeTarget,
-                IOobject::MUST_READ,
+                IOobject::MUST_READ_IF_MODIFIED,
                 IOobject::NO_WRITE
             )
         );

applications/utilities/preProcessing/mdInitialise/mdInitialise.C

@@ -44,7 +44,7 @@ int main(int argc, char *argv[])
             "mdInitialiseDict",
             runTime.system(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

applications/utilities/preProcessing/setFields/setFields.C

@@ -186,7 +186,7 @@ int main(int argc, char *argv[])
             "setFieldsDict",
             runTime.system(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/preProcessing/wallFunctionTable/wallFunctionTableApp.C

@@ -47,7 +47,7 @@ int main(int argc, char *argv[])
             "wallFunctionDict",
             runTime.constant(),
             mesh,
-            IOobject::MUST_READ
+            IOobject::MUST_READ_IF_MODIFIED
         )
     );
 

applications/utilities/surface/surfaceMeshExport/surfaceMeshExport.C

@@ -241,7 +241,7 @@ int main(int argc, char *argv[])
             importName,
             runTime.constant(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     );

applications/utilities/thermophysical/equilibriumCO/equilibriumCO.C

@@ -62,7 +62,7 @@ int main(int argc, char *argv[])
             "BurcatCpData",
             runTime.constant(),
             runTime,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
             false
         )

src/OSspecific/POSIX/fileMonitor.C

@@ -30,6 +30,7 @@ Class
 #include "IOstreams.H"
 #include "Pstream.H"
 #include "PackedList.H"
+#include "PstreamReduceOps.H"
 
 #ifdef FOAM_USE_STAT
 #   include "OSspecific.H"
@@ -57,12 +58,14 @@ const Foam::NamedEnum<Foam::fileMonitor::fileState, 3>
 
 namespace Foam
 {
-    class fileStateEqOp
+    // Reduction operator for PackedList of fileState
+    class reduceFileStates
     {
         public:
-        void operator()(unsigned int& x, const unsigned int& y) const
+        unsigned int operator()(const unsigned int x, const unsigned int y)
+        const
         {
-            // x,y are list of 2bits representing fileState
+            // x,y are sets of 2bits representing fileState
 
             unsigned int mask = 3u;
             unsigned int shift = 0;
@@ -82,7 +85,17 @@ namespace Foam
                 shift += 2;
                 mask <<= 2;
             }
-            x = result;
+            return result;
+        }
+    };
+
+    // Combine operator for PackedList of fileState
+    class combineReduceFileStates
+    {
+        public:
+        void operator()(unsigned int& x, const unsigned int y) const
+        {
+            x = reduceFileStates()(x, y);
         }
     };
 }
@@ -323,7 +336,19 @@ void Foam::fileMonitor::updateStates(const bool syncPar) const
         // Save local state for warning message below
         PackedList<2> thisProcStats(stats);
 
-        Pstream::listCombineGather(stats.storage(), fileStateEqOp());
+        if (stats.storage().size() == 1)
+        {
+            // Optimisation valid for most cases.
+            reduce(stats.storage()[0], reduceFileStates());
+        }
+        else
+        {
+            Pstream::listCombineGather
+            (
+                stats.storage(),
+                combineReduceFileStates()
+            );
+        }
 
         i = 0;
         forAllIter(Map<fileState>, state_, iter)