| name | trtllm-serve-config-guide |
| description | Generate a source-backed starting `trtllm-serve --config` YAML for basic aggregate single-node PyTorch serving, aligned with checked-in TensorRT-LLM configs and deployment docs. Preserves explicit latency / balanced / throughput objectives. Excludes disaggregated, multi-node, and non-MTP speculative configs. |
| license | Apache-2.0 |
| metadata | {"author":"NVIDIA Corporation"} |
Serve Config Guide
Scope: aggregate/IFB (in-flight batching) colocated prefill+decode, single node, PyTorch backend, non-speculative by default; DeepSeek-R1 MTP is the standard mode (all checked-in configs include it).
Input: model, GPU, ISL (input sequence length), OSL (output sequence length), concurrency, TP, performance objective (Min Latency | Balanced | Max Throughput | unspecified).
Output: repo-grounded starting YAML for trtllm-serve --config.
If the request is adjacent but out of scope, provide a best-effort answer using the nearest in-scope config as a starting point, clearly label inferred vs. verified fields, and point to the relevant feature doc in docs/source/features/ (e.g., speculative-decoding, disagg-serving, parallel-strategy) or examples/llm-api/.
Constraints
-
Speculative exclusion: Exclude configs containing speculative_config by default. Exception: exact checked-in DeepSeek-R1 MTP configs (models with decoding_type: MTP in examples/configs/). When including MTP, copy the full speculative_config block verbatim — never interpolate speculative fields.
-
Objective preservation: Preserve the user's stated objective through config selection. Use database.py profile labels (Min Latency, Balanced, Max Throughput; plus Low Latency/High Throughput in smaller sets) as selection aids. If a config is unlabeled, treat it as a default starting point — do not claim it matches a specific objective. If the only match conflicts with the stated objective, call out the mismatch.
-
Source preference: Prefer checked-in configs over interpolation. When docs and configs disagree, prefer the config for the exact scenario and note the mismatch. Mark any interpolation as unverified.
Response Format
For exact matches: Config → Source → Launch command
For interpolated configs: Config → Source used as starting point → What to benchmark (single list of knobs worth sweeping, not per-field unverified tags)
Step 0: Lock Objective and Decode Mode
Identify the user's objective (Min Latency | Balanced | Max Throughput | unspecified) and decode mode (non-speculative or DeepSeek-R1 MTP per Constraint 1). Preserve both through the remaining steps.
Step 1: Exact Database Match
Search examples/configs/database/lookup.yaml for an exact (model, gpu, isl, osl, concurrency, num_gpus) match. Use database.py as a loader/helper.
- Apply speculative exclusion.
- When multiple recipes exist at different concurrency points, use profile labels to match the user's objective per objective preservation.
- Prefer an exact match that also matches the stated objective over manual tuning.
Step 2: Nearest Checked-In Config
If no exact match, widen the search to also include examples/configs/curated/lookup.yaml.
Apply the same constraints as Step 1. Additionally:
- A partial match from
database/ is preferred over a partial match from curated/ for the same model (database configs are benchmark-tuned).
- Exclude disaggregated-only or prefill-only entries (e.g.,
qwen3-disagg-prefill.yaml).
- For curated configs, only treat intent as explicit when the repo labels it (e.g.,
*-latency.yaml, *-throughput.yaml, or guide text).
- If no in-scope config matches the stated objective, pick the nearest same-model starting point and call out the mismatch.
Step 3: Read Model Docs
Search docs/source/deployment-guide/ and examples/models/core/ for the model's deployment guide and README. Read both before adjusting knobs.
Excluded sources: Do NOT use docs/source/legacy/ tuning values or benchmark numbers — those were measured on the TensorRT engine-building backend and do not transfer to PyTorch backend serving.
DeepSeek-V3 caveat: For DeepSeek-V3/V3.2-Exp, use examples/models/core/deepseek_v3/README.md, not the R1 deployment guide.
Step 4: Adjust Source-Backed Fields
Commonly scenario-dependent fields (adjust only these, guided by the checked-in source):
max_batch_size, max_num_tokens, max_seq_len, enable_attention_dp, attention_dp_config.*, kv_cache_config.free_gpu_memory_fraction, moe_expert_parallel_size (MoE), moe_config.backend (when guide specifies), stream_interval, num_postprocess_workers, cuda_graph_config.max_batch_size/batch_sizes, and MTP-specific fields when using DeepSeek-R1 MTP configs.
Do not assume other fields are constant across models/GPUs. For tuning notes, read references/knob-heuristics.md.
Validation Checklist
