<!--
SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

# Running DeepSeek-R1 Disaggregated with WideEP

Dynamo supports SGLang's implementation of wide expert parallelism and large scale P/D for DeepSeek-R1! You can read their blog post [here](https://www.nvidia.com/en-us/technologies/ai/deepseek-r1-large-scale-p-d-with-wide-expert-parallelism/) for more details. We provide a Dockerfile for this in `container/Dockerfile.sglang-deepep` and configurations to deploy this at scale. In this example, we will run 1 prefill worker on 4 H100 nodes and 1 decode worker on 9 H100 nodes (104 total GPUs).

## Instructions

1. Build the SGLang DeepEP container.

```bash
git clone -b v0.4.8.post1 https://github.com/sgl-project/sglang.git
cd sglang/docker
docker build -f Dockerfile -t deepep .
```

You will now have a `deepep:latest` image

2. Build the Dynamo container

```bash
cd $DYNAMO_ROOT
docker build -f container/Dockerfile.sglang-deepep . -t dynamo-deepep --no-cache
```

3. You can run this container on each 8xH100 node using the following command.

> [!IMPORTANT]
> We recommend downloading DeepSeek-R1 and then mounting it to the container. You can find the model [here](https://huggingface.co/deepseek-ai/DeepSeek-R1)

```bash
docker run \
    --gpus all \
    -it \
    --rm \
    --network host \
    --volume /PATH_TO_DSR1_MODEL/:/model/ \
    --shm-size=10G \
    --ulimit memlock=-1 \
    --ulimit stack=67108864 \
    --ulimit nofile=65536:65536 \
    --cap-add CAP_SYS_PTRACE \
    --ipc host \
    dynamo-deepep:latest
```

In each container, you should be in the `/sgl-workspace/dynamo/examples/sglang` directory.

4. On the head prefill node, run the helper script provided to generate commands to start the `nats-server`, `etcd`. This script will also tell you which environment variables to export on each node to make deployment easier.

```bash
./utils/gen_env_vars.sh
```

5. Run the ingress and prefill worker

```bash
# run ingress
dynamo run in=http out=dyn &
# run prefill worker
python3 components/worker.py \
  --model-path /model/ \
  --served-model-name deepseek-ai/DeepSeek-R1 \
  --skip-tokenizer-init \
  --disaggregation-mode prefill \
  --disaggregation-transfer-backend nixl \
  --disaggregation-bootstrap-port 30001 \
  --dist-init-addr ${HEAD_PREFILL_NODE_IP}:29500 \
  --nnodes 4 \
  --node-rank 0 \
  --tp-size 32 \
  --dp-size 32 \
  --enable-dp-attention \
  --decode-log-interval 1 \
  --enable-deepep-moe \
  --page-size 1 \
  --trust-remote-code \
  --moe-dense-tp-size 1 \
  --enable-dp-lm-head \
  --disable-radix-cache \
  --watchdog-timeout 1000000 \
  --enable-two-batch-overlap \
  --deepep-mode normal \
  --mem-fraction-static 0.85 \
  --deepep-config /configs/deepep.json \
  --ep-num-redundant-experts 32 \
  --ep-dispatch-algorithm dynamic \
  --eplb-algorithm deepseek
```

On the other prefill node (since this example has 4 total prefill nodes), run the same command but change `--node-rank` to 1,2, and 3

7. Run the decode worker on the head decode node

```bash
python3 components/decode_worker.py \
  --model-path /model/ \
  --served-model-name deepseek-ai/DeepSeek-R1 \
  --skip-tokenizer-init \
  --disaggregation-mode decode \
  --disaggregation-transfer-backend nixl \
  --disaggregation-bootstrap-port 30001 \
  --dist-init-addr ${HEAD_DECODE_NODE_IP}:29500 \
  --nnodes 9 \
  --node-rank 0 \
  --tp-size 72 \
  --dp-size 72 \
  --enable-dp-attention \
  --decode-log-interval 1 \
  --enable-deepep-moe \
  --page-size 1 \
  --trust-remote-code \
  --moe-dense-tp-size 1 \
  --enable-dp-lm-head \
  --disable-radix-cache \
  --watchdog-timeout 1000000 \
  --enable-two-batch-overlap \
  --deepep-mode low_latency \
  --mem-fraction-static 0.835 \
  --ep-num-redundant-experts 32 \
  --cuda-graph-bs 256
```

On the other decode nodes (this example has 9 total decode nodes), run the same command but change `--node-rank` to 1, 2, 3, 4, 5, 6, 7, and 8

## Benchmarking

In the official [blog post repro instructions](https://github.com/sgl-project/sglang/issues/6017), SGL uses batch inference to benchmark their prefill and decode workers. They do this by pretokenizing the ShareGPT dataset and then creating a batch of 8192 requests with ISL 4096 and OSL 5 (for prefill stress test) and a batch of 40000 with ISL 2000 and OSL 100 (for decode stress test). If you want to repro these benchmarks, you will need to add the following flags to the prefill and decode commands:

prefill:
```bash
...
--max-running-requests 8192 \
--max-total-tokens 131072 \
--context-length 8192 \
--init-expert-location /configs/prefill_in4096.json \
--chunked-prefill-size 524288

```

decode:
```bash
...
--max-running-requests 18432 \
--context-length 4500 \
--init-expert-location /configs/decode_in2000out100.json
```

We currently provide 2 different ways to perform an end to end benchmark which includes using our OpenAI frontend and tokenization. We will continue to add better support for these sorts of large single batch workloads in the future.

1. **GenAI Perf to benchmark end to end performance with 8k ISL 256 OSL**
We've found that 8k ISL 256 OSL provides a good baseline for measuring end to end disaggregated serving performance for DSR1. As WideEP allows for a higher throughput, we provide a script that runs this workload at high concurrencies. DeepGEMM kernels can sometimes take a while to warm up. We provide a short ramping warmup script that can be used.

Example usage:
```bash
# warmup
./utils/bench.sh HEAD_PREFILL_NODE_IP --type warmup
# run benchmark
./utils/bench.sh HEAD_PREFILL_NODE_IP --type e2e
```

2. **GenAI Perf to benchmark completions with custom dataset**
We provide a script that generates a JSONL file of the ShareGPT dataset and then use GenAI Perf to benchmark the prefill and decode workers. We use ShareGPT in order to leverage the pre-existing EPLB distributions provided by the SGLang team. If you don't want to use ShareGPT - you can also use GenAIPerf's synthetic dataset setup But note you will have to use dynamic EPLB configurations or record your own as the `init-expert-location` provided by SGLang is tuned specifically for the ShareGPT dataset at a 4096 ISL and 5 OSL.

Example usage:
```bash
# generate data
python3 utils/generate_bench_data.py --output data.jsonl --num-prompts 8192 --input-len 4096 --output-len 5 --model deepseek-ai/DeepSeek-R1
# run benchmark
./utils/bench.sh HEAD_PREFILL_NODE_IP --type custom_completions
```
