docs: TRTLLM Example of Llama4+Eagle3 (Speculative Decoding) (#1828)

Signed-off-by: KrishnanPrash <140860868+KrishnanPrash@users.noreply.github.com>
Co-authored-by: Iman Tabrizian <10105175+Tabrizian@users.noreply.github.com>

examples/tensorrt_llm/README.md

@@ -350,3 +350,51 @@ unset TRTLLM_USE_NIXL_KVCACHE
 export TRTLLM_USE_UCX_KVCACHE=1
 ```
 
+
+### Example architectures for Llama 4 Maverick Instruct + Eagle Speculative Decoding
+
+#### Notes
+* Testing for the current example used:
+  * One GB200x4 node for aggregate serving
+  * Two GB200x4 nodes for disaggregate serving
+* To run Eagle Speculative Decoding with Llama 4, ensure the container meets the following criteria:
+  * Built with a version of TensorRT-LLM based on the 0.21 release [Link](https://github.com/NVIDIA/TensorRT-LLM/tree/release/0.21)
+  * The TensorRT-LLM build includes the changes from this PR [Link](https://github.com/NVIDIA/TensorRT-LLM/pull/5975)
+* If you need to download model weights off huggingface, make sure you run the command `huggingface-cli login` and have access to the necessary gated models.
+
+##### Aggregated Serving
+```bash
+cd /workspace/examples/tensorrt_llm
+dynamo serve graphs.disagg:Frontend -f configs/llama4/eagle/eagle_agg.yaml
+```
+* Known Issue: In Aggregated Serving, setting `max_num_tokens` to higher values (e.g. `max_num_tokens: 8448`) can lead to Out of Memory (OOM) errors. This is being investigated by the TRTLLM team.
+
+##### Disaggregated Serving
+
+###### Head Node
+Start nats/etcd
+``` bash
+nats-server -js &
+etcd --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://0.0.0.0:2379 --data-dir /tmp/etcd &
+```
+
+Launch graph of Frontend and TensorRTLLMWorker (decode) on head node:
+
+```bash
+cd /workspace/examples/tensorrt_llm
+dynamo serve graphs.agg:Frontend -f configs/llama4/eagle/eagle_disagg.yaml  &
+```
+
+###### Worker Node(s)
+Set environment variables pointing at the etcd/nats endpoints on the head node.
+```bash
+export HEAD_NODE_IP="<head-node-ip>"
+export NATS_SERVER="nats://${HEAD_NODE_IP}:4222"
+export ETCD_ENDPOINTS="${HEAD_NODE_IP}:2379"
+```
+
+Deploy a Prefill worker:
+```bash
+cd /workspace/examples/tensorrt_llm
+dynamo serve components.prefill_worker:TensorRTLLMPrefillWorker -f configs/llama4/eagle/eagle_disagg.yaml --service-name TensorRTLLMPrefillWorker &
+```
\ No newline at end of file

examples/tensorrt_llm/configs/llama4/eagle/eagle_agg.yaml

+# 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.
+
+Frontend:
+  # This is the client-facing model name, you can set this to anything you'd like.
+  served_model_name: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  endpoint: dynamo.TensorRTLLMWorker.generate
+  port: 8000
+  router: round-robin
+
+TensorRTLLMWorker:
+  served_model_name: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  model-path: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  extra-engine-args: "configs/llama4/eagle/engine_configs/agg_config.yaml"
+  router: round-robin
+  ServiceArgs:
+    workers: 1
+    resources:
+      gpu: 4

examples/tensorrt_llm/configs/llama4/eagle/eagle_disagg.yaml

+# 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.
+
+Frontend:
+  served_model_name: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  endpoint: dynamo.TensorRTLLMWorker.generate
+  port: 8000
+  router: round-robin
+
+TensorRTLLMWorker:
+  served_model_name: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  model-path: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  # Path to a YAML file containing additional keyword arguments to pass to the TRTLLM engine.
+  # The fields in `extra-engine-args` holds higher priority than the above TRTLLM engine fields.
+  extra-engine-args: "configs/llama4/eagle/engine_configs/decode_config.yaml"
+  router: round-robin
+  enable-disagg: true
+  ServiceArgs:
+    workers: 1
+    resources:
+      gpu: 4
+
+TensorRTLLMPrefillWorker:
+  model-path: "nvidia/Llama-4-Maverick-17B-128E-Instruct-FP8"
+  # Path to a YAML file containing additional keyword arguments to pass to the TRTLLM engine.
+  # The fields in `extra-engine-args` holds higher priority than the above TRTLLM engine fields.
+  extra-engine-args: "configs/llama4/eagle/engine_configs/prefill_config.yaml"
+  router: round-robin
+  ServiceArgs:
+    workers: 1
+    resources:
+      gpu: 4

examples/tensorrt_llm/configs/llama4/eagle/engine_configs/agg_config.yaml

+# 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.
+
+backend: pytorch
+tensor_parallel_size: 4
+moe_expert_parallel_size: 4
+max_batch_size: 256
+# When max_num_tokens set to higher values, can cause OOM issues.
+# Will be investigated in the future with TRTLLM team.
+max_num_tokens: 1024
+max_seq_len: 8448
+autotuner_enabled: false
+disable_overlap_scheduler: true
+
+# Enable Speculative Decoding in the model engine
+speculative_config:
+  decoding_type: Eagle
+  max_draft_len: 1
+  pytorch_weights_path: nvidia/Llama-4-Maverick-17B-128E-Eagle3
+  eagle3_one_model: False
+
+kv_cache_config:
+  free_gpu_memory_fraction: 0.5
+  enable_block_reuse: false
+
+use_cuda_graph: true
+cuda_graph_padding_enabled: true
+cuda_graph_batch_sizes:
+- 1
+- 2
+- 4
+- 8
+- 16
+- 32
+- 64
+- 128
+- 256
+print_iter_log: true
+kv_cache_dtype: fp8

examples/tensorrt_llm/configs/llama4/eagle/engine_configs/decode_config.yaml

+# 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.
+
+backend: pytorch
+tensor_parallel_size: 4
+moe_expert_parallel_size: 4
+max_batch_size: 256
+max_num_tokens: 512
+# 8704 = 8192 ISL + 512 OSL
+max_seq_len: 8704
+disable_overlap_scheduler: true
+autotuner_enabled: false
+
+# Enable Speculative Decoding in the model engine
+speculative_config:
+  decoding_type: Eagle
+  max_draft_len: 1
+  pytorch_weights_path: nvidia/Llama-4-Maverick-17B-128E-Eagle3
+  eagle3_one_model: False
+
+kv_cache_config:
+  free_gpu_memory_fraction: 0.5
+  enable_block_reuse: false
+
+use_cuda_graph: true
+cuda_graph_padding_enabled: true
+cuda_graph_batch_sizes:
+- 1
+- 2
+- 4
+- 8
+- 16
+- 32
+- 64
+- 128
+- 256
+print_iter_log: true
+kv_cache_dtype: fp8

examples/tensorrt_llm/configs/llama4/eagle/engine_configs/prefill_config.yaml

+# 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.
+
+backend: pytorch
+tensor_parallel_size: 4
+moe_expert_parallel_size: 4
+max_batch_size: 1
+max_num_tokens: 8192
+max_seq_len: 8192
+print_iter_log: true
+kv_cache_dtype: fp8
+disable_overlap_scheduler: true
+autotuner_enabled: false
+
+# Enable Speculative Decoding in the model engine
+speculative_config:
+  decoding_type: Eagle
+  max_draft_len: 1
+  pytorch_weights_path: nvidia/Llama-4-Maverick-17B-128E-Eagle3
+  eagle3_one_model: False
+
+kv_cache_config:
+  free_gpu_memory_fraction: 0.5
+  enable_block_reuse: false