[OMPI users] Strange OpenMPI errors on building Caffe 1.0

Prentice Bisbal

2017-05-05 14:40:52 UTC

This error should really be posted to the caffe mailing list. This is an
error with caffe. Most likely, you are not specifying the location to
your Open MPI installation properly. And Caffe definitely depends on
OpenMPI you errors:

.build_release/lib/libcaffe.so: undefined reference to
`ompi_mpi_cxx_op_intercept'
.build_release/lib/libcaffe.so: undefined reference to
`MPI::Datatype::Free()'
.build_release/lib/libcaffe.so: undefined reference to `MPI::Comm::Comm()'
.build_release/lib/libcaffe.so: undefined reference to `MPI::Win::Free()'

Are basically saying that the libcaffe shared library (libcaffe.so) was
compiled making references to MPI functions, but now can't find the
libraries that actually provide those functions. This means that when
libcaffe.so was compiled, it could find the OpenMPI headers containing
the function prototypes, but can't the actual libraries.

To fix, your command needs a -L argument specifying the path to where
the OpenMPI libaries are located, followed by -l (lower case L)
arguments for each of the MPI libraries you need. -lmpi is probably one
of them, but most MPI implementations require additional libraries, such
as -lopen-rte, -lopen-pal, etc., for Open MPI

While I think I've answered your questions, it's best you ask this on a
Caffe mailing list, because if the build process could find your MPI
headers but not your MPI libraries, you either configured your build
incorrectly, or something about the Caffe configure/build process is
broken, so you either need to find out how to configure your build
correctly, or report a bug in the Caffe build process.

Prentice

Post by Lane, William
I know this could possibly be off-topic, but the errors are OpenMPI
errors and if anyone could shed light on the nature of these errors I
CXX/LD -o .build_release/tools/upgrade_solver_proto_text.bin
g++ .build_release/tools/upgrade_solver_proto_text.o -o
.build_release/tools/upgrade_solver_proto_text.bin -pthread -fPIC
-DCAFFE_VERSION=1.0.0-rc5 -DNDEBUG -O2 -DUSE_OPENCV -DUSE_LEVELDB
-DUSE_LMDB -DCPU_ONLY -DWITH_PYTHON_LAYER
-I/hpc/apps/python27/include/python2.7
-I/hpc/apps/python27/externals/numpy/1.9.2/lib/python2.7/site-packages/numpy/core/include
-I/usr/local/include -I/hpc/apps/hdf5/1.8.17/include
-I.build_release/src -I./src -I./include
-I/hpc/apps/atlas/3.10.2/include -Wall -Wno-sign-compare -lcaffe
-L/hpc/apps/gflags/lib -L/hpc/apps/python27/lib
-L/hpc/apps/python27/lib/python2.7 -L/hpc/apps/atlas/3.10.2/lib
-L.build_release/lib -lglog -lgflags -lprotobuf -lboost_system
-lboost_filesystem -lm -lhdf5_hl -lhdf5 -lleveldb -lsnappy -llmdb
-lopencv_core -lopencv_highgui -lopencv_imgproc -lboost_thread
-lstdc++ -lboost_python -lpython2.7 -lcblas -latlas \
-Wl,-rpath,\$ORIGIN/../lib
.build_release/lib/libcaffe.so: undefined reference to
`ompi_mpi_cxx_op_intercept'
.build_release/lib/libcaffe.so: undefined reference to
`MPI::Datatype::Free()'
.build_release/lib/libcaffe.so: undefined reference to `MPI::Comm::Comm()'
.build_release/lib/libcaffe.so: undefined reference to `MPI::Win::Free()'
collect2: error: ld returned 1 exit status
I've read this may be due to a dependency of Caffe that uses OpenMPI
(since I've been told Caffe itself doesn't use OpenMPI).
Would adding -l directives to LIBRARIES line in the Makefile for Caffe
that reference all OpenMPI libraries fix this problem?
For example, -l mpi.
Thank you in advance. Hopefully this isn't entirely OT.
William L.
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