[mpi] add engine_mpi travis build (#83)

.travis.yml

@@ -8,6 +8,7 @@ env:
     - TASK=lint LINT_LANG=python
     - TASK=doc
     - TASK=build
+    - TASK=mpi-build
     - TASK=test
 
 # dependent apt packages
@@ -24,6 +25,11 @@ addons:
       - python-numpy
       - gcc-4.8
       - g++-4.8
+      - openmpi-bin
+      - openmpi-common
+      - openssh-client
+      - openssh-server
+      - libopenmpi-dev
       
 before_install:
   - git clone https://github.com/dmlc/dmlc-core

scripts/travis_script.sh

@@ -14,6 +14,11 @@ if [ ${TASK} == "build" ]; then
     make all || exit -1
 fi
 
+if [ ${TASK} == "mpi-build" ]; then
+    cd test
+    make mpi && make speed_test.mpi || exit -1
+fi
+
 if [ ${TASK} == "test" ]; then
     cd test
     make all || exit -1

test/Makefile

@@ -52,7 +52,7 @@ $(OBJ) :
 	$(CXX) -c $(CFLAGS) -o $@ $(firstword $(filter %.cpp %.c %.cc, $^) )
 
 $(MPIBIN) :
-	$(MPICXX) $(CFLAGS) -o $@ $(filter %.cpp %.o %.c %.cc, $^) $(LDFLAGS) -lrabit_mpi
+	$(MPICXX) $(CFLAGS) -o $@ $(filter %.cpp %.o %.c %.cc, $^) ../lib/librabit_mpi.so $(LDFLAGS)
 
 clean:
 	$(RM) $(OBJ) $(BIN) $(MPIBIN) $(MPIOBJ) *~ ../src/*~