[!334] adds option for fake mpi

Merge branch 'feature/no-mpi-option' into 'master'

ref:extensions/dune-codegen Useful for performance measuring with Intel SDE.

See merge request [extensions/dune-codegen!334]

  [extensions/dune-codegen!334]: gitlab.dune-project.org/extensions/dune-codegen/merge_requests/334

cmake/modules/DuneCodegenMacros.cmake

@@ -116,6 +116,11 @@ function(dune_add_generated_executable)
     message(FATAL_ERROR "Unrecognized arguments in dune_add_generated_executable. This usually indicates a typo.")
   endif()
 
+  set(MPI_OPTION "0")
+  if(MPI_FOUND)
+    set(MPI_OPTION "1")
+  endif()
+
   # Apply defaults and enforce requirements
   if(NOT GEN_TARGET)
     message(FATAL_ERROR "Need to specify the TARGET parameter for dune_add_generated_executable")
@@ -139,6 +144,7 @@ function(dune_add_generated_executable)
                                --target-name ${GEN_TARGET}
                                --driver-file ${GEN_SOURCE}
                                --project-basedir ${CMAKE_BINARY_DIR}
+                               --with-mpi ${MPI_OPTION}
                                ${GEN_FORM_COMPILER_ARGS}
                        DEPENDS ${GEN_UFLFILE} ${UFL2PDELAB_SOURCES} ${GEN_DEPENDS} ${DUNE_CODEGEN_ADDITIONAL_PYTHON_SOURCES}
                        COMMENT "Generating driver for the target ${GEN_TARGET}"
@@ -199,6 +205,7 @@ function(dune_add_generated_executable)
                                --ini-file ${GEN_INIFILE}
                                --target-name ${GEN_TARGET}
                                --operator-to-build ${op}
+                               --with-mpi ${MPI_OPTION}
                                ${ANALYZE_GRID_OPTION}
                        DEPENDS ${GEN_UFLFILE} ${UFL2PDELAB_SOURCES} ${GEN_DEPENDS} ${DUNE_CODEGEN_ADDITIONAL_PYTHON_SOURCES} ${ANALYZE_GRID_FILE}
                        COMMENT "Generating operator file ${depdata___${op}} for the target ${GEN_TARGET}"

python/dune/codegen/options.py

@@ -58,6 +58,7 @@ class CodegenGlobalOptionsArray(ImmutableRecord):
     debug_interpolate_input = CodegenOption(default=False, helpstr="Should the input for printresidual and printmatix be interpolated (instead of random input).")
     use_likwid = CodegenOption(default=False, helpstr="Use likwid instead of own performance measurements.")
     autotune_google_benchmark = CodegenOption(default=False, helpstr="Use google-benchmark library for autotuning (when autotuning is activated).")
+    with_mpi = CodegenOption(default=True, helpstr="The module was configured with mpi")
 
     # Arguments that are mainly to be set by logic depending on other options
     max_vector_width = CodegenOption(default=256, helpstr=None)

python/dune/codegen/pdelab/driver/__init__.py

@@ -215,7 +215,10 @@ def name_initree():
 @preamble(section="init")
 def define_mpihelper(name):
     include_file("dune/common/parallel/mpihelper.hh", filetag="driver")
-    return "Dune::MPIHelper& {} = Dune::MPIHelper::instance(argc, argv);".format(name)
+    if get_option("with_mpi"):
+        return "Dune::MPIHelper& {} = Dune::MPIHelper::instance(argc, argv);".format(name)
+    else:
+        return "Dune::FakeMPIHelper& {} = Dune::FakeMPIHelper::instance(argc, argv);".format(name)
 
 
 def name_mpihelper():