Merge branch 'fix/iterative-full-parallel' into 'master'

Added missing GetRowComm in AllReduce call.

This MR fixes the IterativeFull solver to work in parallel.

See merge request !685

CHANGELOG.md

@@ -58,11 +58,12 @@ v4.4.0
 v4.3.4
 ------
 **Library:**
-- Fix performance issue with `v_ExtractDataToCoeffs` for post-processing of large
-  simulations (!672)
+- Fix performance issue with `v_ExtractDataToCoeffs` for post-processing of
+  large simulations (!672)
 - Added additional assertions to ensure homogeneous simulations have an even
   number of planes per process (!666)
 - Fix compilation with NEKTAR_USE_MESHGEN option
+- Fix IterativeFull solver in parallel (!685)
 
 v4.3.3
 ------

library/MultiRegions/GlobalLinSysIterativeFull.cpp

@@ -136,7 +136,8 @@ namespace Nektar
             int nGlobDofs = pLocToGloMap->GetNumGlobalCoeffs();
             int nDirTotal = nDirDofs;
             
-            expList->GetComm()->AllReduce(nDirTotal, LibUtilities::ReduceSum);
+            expList->GetComm()->GetRowComm()
+                   ->AllReduce(nDirTotal, LibUtilities::ReduceSum);
             
             Array<OneD, NekDouble> tmp(nGlobDofs), tmp2;