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+# RCCL Topology Explorer (topo_expl)
+
+The RCCL Topology Explorer is a tool for analyzing and exploring network topologies for RCCL (ROCm Communication Collectives Library) collective operations. It simulates various hardware configurations and displays the actual algo/proto combo selections that RCCL would make.
+
+## Building
+
+### Prerequisites
+- ROCm/HIP development environment
+- RCCL source code
+- hipify-perl (for source transformation)
+
+### Build Instructions
+
+```bash
+cd tools/topo_expl
+make
+```
+
+## Usage
+
+```bash
+./topo_expl -m model_id [-n numNodes=1]
+```
+
+### Parameters
+
+- `-m model_id`: Specifies the topology model to use (required)
+- `-n numNodes`: Number of nodes to simulate (default: 1)
+
+### Available Models
+
+Run `./topo_expl` without arguments to see the list of available models. Each model represents a different hardware configuration. [Each model file](./models) pertains to a particular GPU model and node configuration. It can be output by RCCL through setting the environment variable `NCCL_TOPO_DUMP_FILE`. Model XMLs have been generated for simplicity.
+
+## Example Usage: Print RCCL's algorithm/protocol selections
+
+The tool is typically run with the `NCCL_DEBUG=INFO` environment variable, but for the convenience of just printing the algo/proto table, we use version `NCCL_DEBUG=version` in this example to avoid printing topo details.
+
+```bash
+# List available models
+./topo_expl
+
+# Test MI300 configuration (model 55)
+NCCL_DEBUG=version ./topo_expl -m 55
+
+# Test a multi-node MI300 configuration with 8 nodes
+NCCL_DEBUG=version ./topo_expl -m 55 -n 8
+
+# Test MI250 configuration (model 42)
+NCCL_DEBUG=version ./topo_expl -m 42
+
+# Test a multi-node MI250 configuration with 4 nodes
+NCCL_DEBUG=version ./topo_expl -m 42 -n 4
+```
+
+
+## Sample output
+
+```bash
+# cmd used
+NCCL_DEBUG=version ./topo_expl -m 55 -n 8
+```
+
+```bash
+
+Running fp32 production choices for algorithm/protocol/maxChannels
+| Max Size(B)     | Count           | Collective      | Algorithm  | Protocol   | Max Channels |
+|-----------------|-----------------|-----------------|------------|------------|--------------|
+| 32              | 8               | AllReduce       | Tree       | LL         | 1            |
+| 64              | 16              | AllReduce       | Tree       | LL         | 1            |
+| 128             | 32              | AllReduce       | Tree       | LL         | 1            |
+| 256             | 64              | AllReduce       | Tree       | LL         | 1            |
+| 512             | 128             | AllReduce       | Tree       | LL         | 1            |
+| 1024            | 256             | AllReduce       | Tree       | LL         | 1            |
+| 2048            | 512             | AllReduce       | Tree       | LL         | 1            |
+| 4096            | 1024            | AllReduce       | Tree       | LL         | 2            |
+| 8192            | 2048            | AllReduce       | Tree       | LL         | 4            |
+| 16384           | 4096            | AllReduce       | Tree       | LL         | 8            |
+| 32768           | 8192            | AllReduce       | Tree       | LL         | 16           |
+| 65536           | 16384           | AllReduce       | Tree       | LL         | 32           |
+| 131072          | 32768           | AllReduce       | Tree       | LL         | 64           |
+| 262144          | 65536           | AllReduce       | Tree       | LL         | 64           |
+| 524288          | 131072          | AllReduce       | Tree       | LL         | 64           |
+| 1048576         | 262144          | AllReduce       | Tree       | LL         | 64           |
+| 2097152         | 524288          | AllReduce       | Tree       | LL128      | 64           |
+| 4194304         | 1048576         | AllReduce       | Tree       | LL128      | 64           |
+| 8388608         | 2097152         | AllReduce       | Tree       | LL128      | 64           |
+| 16777216        | 4194304         | AllReduce       | Tree       | LL128      | 64           |
+| 33554432        | 8388608         | AllReduce       | Tree       | LL128      | 64           |
+| 67108864        | 16777216        | AllReduce       | Tree       | Simple     | 64           |
+| 134217728       | 33554432        | AllReduce       | Tree       | Simple     | 64           |
+| 268435456       | 67108864        | AllReduce       | Tree       | Simple     | 64           |
+| 536870912       | 134217728       | AllReduce       | Ring       | Simple     | 64           |
+| 1073741824      | 268435456       | AllReduce       | Ring       | Simple     | 64           |
+| 2147483648      | 536870912       | AllReduce       | Ring       | Simple     | 64           |
+| 4294967296      | 1073741824      | AllReduce       | Ring       | Simple     | 64           |
+...
+```
+