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36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
# Topology Visualizer
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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.
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## Requirements
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Following packages are required to run Topology Visualizer:
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1. gawk
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2. graphviz
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## Usage
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Topology Visualizer accepts both RCCL log files or simulator output, i.e. [Topology Explorer](https://github.com/ROCm/rocm-systems/tree/develop/projects/rccl/tools/topo_expl "Topology Explorer").
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RCCL logs needs to be collected with NCCL_DEBUG=INFO and NCCL_DEBUG_SUBSYS=INIT,GRAPH environmental variables. Example command line:
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```shell
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mpirun -np 4 -host rocm-framework-1,rocm-framework-3,rocm-framework-5,rocm-framework-6 \
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-env HSA_FORCE_FINE_GRAIN_PCIE 1 -env NCCL_DEBUG INFO -env NCCL_DEBUG_SUBSYS INIT,GRAPH \
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~/rccl-tests/build/all_reduce_perf -b 8 -e 128M -f 2 -g 8 | tee ~/4_nodes.log
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./topo_visual.sh -i 4_nodes.log
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```
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## Legend
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Solid lines: connections over P2P or shared memory
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Dashed lines: connections over network
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Green: P2P connections, network connections with GPU RDMA
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Red: Connections over shared memory or without GPU RDMA
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## Example Output
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## Copyright
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All source code and accompanying documentation are copyright (c) 2019-2020 Advanced Micro Devices, Inc. All rights reserved.
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