Reply To: Multiple GPU compiler error: cannot find -lmpi_cxx: No such file or director

[aseidler]

Hi thanhphatvt,

the following helped for me:

i changed the “lib” in the Makefile in olb.1.7.r0/externals to this:

all: lib zlib tinyxml
.PHONY: zlib tinyxml

lib:
mkdir -p lib

zlib:
make -C zlib
cp zlib/build/libz.a lib/

clean_zlib:
make -C zlib clean

tinyxml:
make -C tinyxml
cp tinyxml/build/libtinyxml.a lib/

clean_tinyxml:
make -C tinyxml clean

clean: clean_zlib clean_tinyxml
rm -f lib/libz.a lib/libtinyxml.a

and than this is my final config.mk for olb.1.7r0:

CXX := nvcc -ccbin=mpicxx
CC := nvcc -ccbin=mpicc

CXXFLAGS := -O3
CXXFLAGS += -std=c++17

PARALLEL_MODE := MPI

PLATFORMS := CPU_SISD GPU_CUDA

CUDA_ARCH := 80

FLOATING_POINT_TYPE := float

USE_EMBEDDED_DEPENDENCIES := ON

Furthermore i got the problem on our HPC that OpenMPI is not working when just loading the module so here are my modules I am using for HPC in Dresden:

ml release/23.04 GCC/11.3.0 OpenMPI/4.1.4 CUDA/11.7 UCX-CUDA

I hope that this answer is helpful for you.

-Alex