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Update README.md to improve KV Cache description of DP #198

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Update README.md to improve KV Cache description of DP #198

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4 changes: 2 additions & 2 deletions blogs/software-tools-optimization/vllm-moe-guide/README.md
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Expand Up @@ -407,13 +407,13 @@ When you use `--data-parallel-size 8` **without** `--enable-expert-parallel`:
- Requires AllGather before routed experts (gather shared expert outputs)
- Requires ReduceScatter after routed experts (reduce and distribute results)
- **MoE shared expert: SHARDED**
- KV cache: **Full KV cache on each GPU** (NOT partitioned \- each GPU processes its own separate batch)
- KV cache is **partitioned** across GPUs; each GPU holds the cache only for the requests it is assigned.
- Communication: Uses AllGather (before routed experts) \+ ReduceScatter (after routed experts), **NOT AllToAll**
- **No DP Attention behavior**

**Figure 6** illustrates this architecture, showing how routed experts are sharded across all 8 GPUs with AllGather and ReduceScatter communication patterns.

```{figure} ./images/dp_without_ep_moe_v2.svg
```{figure} ./images/dp_without_ep_moe_v3.svg
:alt: Data flow for DP=8 without Expert Parallelism
:width: 800px
:align: center
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76 changes: 6 additions & 70 deletions ...moe-guide/images/dp_without_ep_moe_v2.svg → ...moe-guide/images/dp_without_ep_moe_v3.svg
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