NCCL_HOME set, and still nccl.h: No such file or directory

[WurmD]

$ git clone https://github.com/NVIDIA/nccl.git
$ git clone https://github.com/NVIDIA/nccl-tests.git
$ cd nccl-tests
$ make MPI=1 NCCL_HOME=/home/dario/nccl/src 

make -C src build
make[1]: Entering directory '/mnt/home/dario/nccl-tests/src'
Compiling  all_reduce.cu                       > ../build/all_reduce.o
In file included from all_reduce.cu:8:0:
common.h:9:10: fatal error: nccl.h: No such file or directory
 #include "nccl.h"
          ^~~~~~~~
compilation terminated.
Makefile:82: recipe for target '../build/all_reduce.o' failed
make[1]: *** [../build/all_reduce.o] Error 1
make[1]: Leaving directory '/mnt/home/dario/nccl-tests/src'
Makefile:17: recipe for target 'src.build' failed
make: *** [src.build] Error 2

What now?

[kwen2501]

If NCCL is built under the same folder where you clone it, then nccl.h should be under the build subfolder rather than the src subfolder. Thus, you can use the command: make -j MPI=1 NCCL_HOME=/home/dario/nccl/build

[WurmD]

cd ~/nccl
make -j src.build
cd ~/nccl-tests
make MPI=1 NCCL_HOME=/home/dario/nccl/build MPI_HOME=/usr/lib/x86_64-linux-gnu/openmpi

success ^_^

[XiaoqingNLP]

@WurmD I am used the lastest nccl version and found that my nccl.h file path is ./build/include/nccl.h. How can I deal this problem ?

[sjeaugey]

What is the problem? nccl.h being under include/ is expected.

If you compile NCCL tests with NCCL_HOME=/path/to/nccl/build then the build will include -I $NCCL_HOME/include so it should find nccl.h.

[XiaoqingNLP]

@sjeaugey Thank you, I have solved.