NCCL 2.x failed to build on Mac OS

[TomHeaven]

I tried to build NCCL 2.4 on Mac OS but failed with the following errors:

iMac:nccl tomheaven$ make
/Applications/Xcode.app/Contents/Developer/usr/bin/make -C src build BUILDDIR=/Volumes/Data/libraries/nccl/build
Compiling  init.cu                             > /Volumes/Data/libraries/nccl/build/obj/init.o
include/transport.h(64): error: identifier "pthread_mutex_t" is undefined

include/transport.h(71): error: identifier "pthread_cond_t" is undefined

include/transport.h(72): error: identifier "pthread_mutex_t" is undefined

include/cpuset.h(22): error: identifier "cpu_set_t" is undefined

include/cpuset.h(23): error: identifier "cpu_set_t" is undefined

include/cpuset.h(45): error: identifier "cpu_set_t" is undefined

include/cpuset.h(45): error: identifier "mask" is undefined

include/cpuset.h(45): error: expected a ")"

include/cpuset.h(45): error: expected a ";"

/usr/include/dlfcn.h(50): error: expected a declaration

/usr/include/dlfcn.h(52): error: identifier "Dl_info" is undefined

/usr/include/dlfcn.h(85): error: expected a declaration

init.cu(41): warning: parsing restarts here after previous syntax error

init.cu(861): error: "cpu_set_t" is not a type name

init.cu(862): error: identifier "CPU_ZERO_S" is undefined

init.cu(882): error: expected a ";"

init.cu(883): error: identifier "sched_getaffinity" is undefined

init.cu(886): error: expected a ";"

init.cu(887): error: identifier "gpuMask" is undefined

init.cu(888): error: expected a ";"

init.cu(889): error: identifier "finalMask" is undefined

init.cu(889): error: identifier "gpuMask" is undefined

init.cu(889): error: identifier "CPU_AND" is undefined

init.cu(892): error: identifier "CPU_COUNT" is undefined

init.cu(894): error: expression preceding parentheses of apparent call must have (pointer-to-) function type

init.cu(896): error: identifier "sched_setaffinity" is undefined

init.cu(902): error: expected a ";"

init.cu(903): error: identifier "affinitySave" is undefined

init.cu(903): error: identifier "sched_getaffinity" is undefined

init.cu(918): error: identifier "sched_setaffinity" is undefined

init.cu(1085): error: expected a ";"

init.cu(1086): error: identifier "affinitySave" is undefined

init.cu(1086): error: identifier "sched_getaffinity" is undefined

init.cu(1100): error: identifier "sched_setaffinity" is undefined

33 errors detected in the compilation of "/var/folders/2j/db1czwqj1jd1yf8n_m94y_6r0000gn/T//tmpxft_000059a2_00000000-11_init.compute_70.cpp1.ii".
make[1]: *** [/Volumes/Data/libraries/nccl/build/obj/init.o] Error 1
make: *** [src.build] Error 2

I find previous issues #61 and #62, which suggests minor changes may make the project work on Mac OS. I hope that come true in the near future.

[TomHeaven]

I managed to migrate this project to MacOS by adding missing funcitons and fix building parameters. The project page is: https://github.com/TomHeaven/nccl-osx.

It is NOT fully funcitonal but can be used in Pytorch and enables GLOO backend.