NCCL_GRAPH The INFO of the logo cannot be printed to the console or to a specified file

[lmhahatest]

Please, which NCCL_DEBUG setting needs to be configured in order for the information identified by NCCL_GRAPH to be printed to the console or a specified file?
eg：
INFO(NCCL_GRAPH, "init.cc 1 Ring 2-1 LM test %02d : %d -> %d -> %d", c, comm->channels[c].ring.prev, comm->rank, comm->channels[c].ring.next); can't work when run "mpirun -np 4 -x NCCL_ALGO=ring -x NCCL_DEBUG=TRACE all_reduce_perf -b 8G -e 8G -f 2 -g 1 2>&1 |tee output_file.txt"

[marksantesson]

Hi lmhahatest, In general, to see any INFO log you need to have "NCCL_DEBUG=INFO" or more (i.e., ABORT or TRACE will also work), and then also indicate "NCCL_DEBUG_SUBSYS=GRAPH" to get those settings. If you do not set NCCL_DEBUG_SUBSYS explicitly then you will get the default, which in v2.23 is INIT, BOOTSTRAP, and ENV as per the default for ncclDebugMask in src/debug.cc.

Does that answer your question?