Topology Visualizer extracts topology information from RCCL log file and presents graphically. Less than optimal connections between GPUs and nodes are highlighted in red for easy identification.

Requirements

Following packages are required to run Topology Visualizer:

gawk
graphviz

Usage

Topology Visualizer accepts both RCCL log files or simulator output, i.e. Topology Explorer.

RCCL logs needs to be collected with NCCL_DEBUG=INFO and NCCL_DEBUG_SUBSYS=INIT,GRAPH environmental variables. Example command line:

mpirun -np 4 -host rocm-framework-1,rocm-framework-3,rocm-framework-5,rocm-framework-6 \
  -env HSA_FORCE_FINE_GRAIN_PCIE 1 -env NCCL_DEBUG INFO -env NCCL_DEBUG_SUBSYS INIT,GRAPH \
  ~/rccl-tests/build/all_reduce_perf -b 8 -e 128M -f 2 -g 8 | tee ~/4_nodes.log

./topo_visual.sh -i 4_nodes.log

Legend

Solid lines: connections over P2P or shared memory

Dashed lines: connections over network

Green: P2P connections, network connections with GPU RDMA

Red: Connections over shared memory or without GPU RDMA

README.md

Topology Visualizer

Requirements

Usage

Legend

Example Output

Copyright