message: Try travis-ci testing on ubuntu with MPICH using 4 mpi tasks.
  Also, enabled the tests in miniapps/performance with codecov.
diff: @@ -14,7 +14,7 @@ env:
  global:
  - TMPDIR=/tmp
  # Travis VM environment provides 2 processor cores.
  - - NPROCS=2
  + - NPROCS=4
  matrix:
  - DEBUG=YES
  MPI=YES
  @@ -39,8 +39,10 @@ addons:
  - ubuntu-toolchain-r-test
  packages:
  - g++-4.9
  - - openmpi-bin
  - - libopenmpi-dev;
  + - mpich
  + - libmpich-dev
  +# - openmpi-bin
  +# - libopenmpi-dev;
  # Test with GCC on Linux an Clang on Mac
  matrix:
  @@ -110,11 +112,22 @@ install:
  fi
  script:
  + # System info
  + - if [ "$TRAVIS_OS_NAME" == "linux" ]; then
  + cat /proc/{version,cpuinfo,meminfo};
  + elif [ "$TRAVIS_OS_NAME" == "osx" ]; then
  + /usr/sbin/sysctl kern.version hw;
  + fi;
  +
  # Compiler
  - if [ $MPI == "YES" ]; then
  export MYCXX=mpic++;
  + if [ "$TRAVIS_OS_NAME" == "linux" ]; then
  + export MPICH_CXX="$CXX";
  + else
  export OMPI_CXX="$CXX";
  $MYCXX --showme:version;
  + fi;
  else
  export MYCXX="$CXX";
  fi
  @@ -127,7 +140,7 @@ script:
  SKIP_TEST_DIRS="" &&
  if [ "$CODECOV" == "YES" ]; then
  CPPFLAGS="--coverage -g";
  - SKIP_TEST_DIRS="miniapps/performance";
  +# SKIP_TEST_DIRS="miniapps/performance";
  fi &&
  make config MFEM_USE_MPI=$MPI MFEM_DEBUG=$DEBUG MFEM_CXX="$MYCXX"
  MFEM_MPI_NP=$NPROCS CPPFLAGS="$CPPFLAGS" &&
  