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Update Tutorial.md to clarify link_num calculation #61

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Jan 3, 2025
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Update Tutorial.md to clarify link_num calculation #61

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12 changes: 12 additions & 0 deletions docs/Tutorial.md
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Expand Up @@ -167,8 +167,20 @@ As shown in the figure below, the first row represents various parameters: `node
| `link_num` | Total number of connections |
| `gpu_type_str` | Type of GPU |

The following command generates the topology shown in the image:
```bash
python3 ./astra-sim-alibabacloud/inputs/topo/gen_HPN_7.0_topo_mulgpus_one_link.py -g 8 -gt A100 -bw 400Gbps -nvbw 2400Gbps -psn 1
```
<img src="./images/simai_topo.png" alt="simai_topo" width="30%">

The `link_num` is `20` because each ASW (Aggregation Switch) is connected to a single PSW (Pod Switch, node 17). Since the topology uses `-psn 1` (single-plane topology), only one plane of PSWs is utilized, limiting the connections to `4` between ASWs and PSWs.

To increase the `link_num` to `24`, you need to enable a dual-plane topology by setting `-ps`n to `2` in the command. This will activate both planes of PSWs, doubling the connections between ASWs and PSWs. For example:

```bash
python3 ./astra-sim-alibabacloud/inputs/topo/gen_HPN_7.0_topo_mulgpus_one_link.py -g 8 -gt A100 -bw 400Gbps -nvbw 2400Gbps -psn 2
```

You can choose to customize any `topo` following the format shown above. Of course, we also provide a script to directly generate a `topo` for the HPN architecture.

```bash
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