docs: Triton TRT-LLM user guide (#7529)

Author: krishung5

docs/getting_started/trtllm_user_guide.md

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+
+# TensorRT-LLM User Guide
+
+## What is TensorRT-LLM
+
+[TensorRT-LLM](https://github.com/NVIDIA/TensorRT-LLM)
+(TRT-LLM) is an open-source library designed to accelerate and optimize the
+inference performance of large language models (LLMs) on NVIDIA GPUs. TRT-LLM
+offers users an easy-to-use Python API to build TensorRT engines for LLMs,
+incorporating state-of-the-art optimizations to ensure efficient inference on
+NVIDIA GPUs.
+
+## How to run TRT-LLM models with Triton Server via TensorRT-LLM backend
+
+The
+[TensorRT-LLM Backend](https://github.com/triton-inference-server/tensorrtllm_backend)
+lets you serve TensorRT-LLM models with Triton Inference Server. Check out the
+[Getting Started](https://github.com/triton-inference-server/tensorrtllm_backend?tab=readme-ov-file#getting-started)
+section in the TensorRT-LLM Backend repo to learn how to utlize the
+[NGC Triton TRT-LLM container](https://catalog.ngc.nvidia.com/orgs/nvidia/containers/tritonserver)
+to prepare engines for your LLM models and serve them with Triton.
+
+## How to use your custom TRT-LLM model
+
+All the supported models can be found in the
+[examples](https://github.com/NVIDIA/TensorRT-LLM/tree/main/examples) folder in
+the TRT-LLM repo. Follow the examples to convert your models to TensorRT
+engines.
+
+After the engine is built, [prepare the model repository](https://github.com/triton-inference-server/tensorrtllm_backend?tab=readme-ov-file#prepare-the-model-repository)
+for Triton, and
+[modify the model configuration](https://github.com/triton-inference-server/tensorrtllm_backend?tab=readme-ov-file#modify-the-model-configuration).
+
+Only the *mandatory parameters* need to be set in the model config file. Feel free
+to modify the optional parameters as needed. To learn more about the
+parameters, model inputs, and outputs, see the
+[model config documentation](ttps://github.com/triton-inference-server/tensorrtllm_backend/blob/main/docs/model_config.md) for more details.
+
+## Advanced Configuration Options and Deployment Strategies
+
+Explore advanced configuration options and deployment strategies to optimize
+and run Triton with your TRT-LLM models effectively:
+
+- [Model Deployment](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#model-deployment): Techniques for efficiently deploying and managing your models in various environments.
+- [Multi-Instance GPU (MIG) Support](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#mig-support): Run Triton and TRT-LLM models with MIG to optimize GPU resource management.
+- [Scheduling](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#scheduling): Configure scheduling policies to control how requests are managed and executed.
+- [Key-Value Cache](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#key-value-cache): Utlizte KV cache and KV cache reuse to optimize memory usage and improve performance.
+- [Decoding](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#decoding): Advanced methods for generating text, including top-k, top-p, top-k top-p, beam search, Medusa, and speculative decoding.
+- [Chunked Context](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#chunked-context): Splitting the context into several chunks and batching them during generation phase to increase overall throughput.
+- [Quantization](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#quantization): Apply quantization techniques to reduce model size and enhance inference speed.
+- [LoRa (Low-Rank Adaptation)](https://github.com/triton-inference-server/tensorrtllm_backend/tree/main?tab=readme-ov-file#lora): Use LoRa for efficient model fine-tuning and adaptation.
+
+## Tutorials
+
+Make sure to check out the
+[tutorials](https://github.com/triton-inference-server/tutorials) repo to see
+more guides on serving popular LLM models with Triton Server and TensorRT-LLM,
+as well as deploying them on Kubernetes.
+
+## Benchmark
+
+[GenAI-Perf](https://github.com/triton-inference-server/perf_analyzer/tree/main/genai-perf)
+is a command line tool for measuring the throughput and latency of LLMs served
+by Triton Inference Server. Check out the
+[Quick Start](https://github.com/triton-inference-server/perf_analyzer/tree/main/genai-perf#quick-start)
+to learn how to use GenAI-Perf to benchmark your LLM models.
+
+## Performance Best Practices
+
+Check out the
+[Performance Best Practices guide](https://nvidia.github.io/TensorRT-LLM/performance/perf-best-practices.html)
+to learn how to optimize your TensorRT-LLM models for better performance.
+
+## Metrics
+
+Triton Server provides
+[metrics](https://github.com/triton-inference-server/server/blob/main/docs/user_guide/metrics.md)
+indicating GPU and request statistics.
+See the
+[Triton Metrics](https://github.com/triton-inference-server/tensorrtllm_backend?tab=readme-ov-file#triton-metrics)
+section in the TensorRT-LLM Backend repo to learn how to query the Triton
+metrics endpoint to obtain TRT-LLM statistics.
+
+## Ask questions or report issues
+
+Can't find what you're looking for, or have a question or issue? Feel free to
+ask questions or report issues in the GitHub issues page:
+
+- [TensorRT-LLM](https://github.com/NVIDIA/TensorRT-LLM/issues)
+- [TensorRT-LLM Backend](https://github.com/triton-inference-server/tensorrtllm_backend/issues)
+- [Triton Inference Server](https://github.com/triton-inference-server/server/issues)