# Log Description - FastDeploy: Large Language Model Deployment

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# Log Description

FastDeploy generates the following log files during deployment. Below is an explanation of each log's purpose. By default, logs are stored in the `log` directory under the execution path. To specify a custom directory, set the environment variable `FD_LOG_DIR`.

## Inference Service Logs

- `backup_env.*.json` : Records environment variables set during instance startup. The number of files matches the number of GPU cards.
- `envlog.*` : Logs environment variables set during instance startup. The number of files matches the number of GPU cards.
- `console.log` : Records model startup time and other information. This log is also printed to the console.
- `data_processor.log` : Logs input/output data encoding and decoding details.
- `fastdeploy.log` : Records configuration information during instance startup, as well as request and response details during runtime.
- `workerlog.*` : Tracks model loading progress and inference operator errors. Each GPU card has a corresponding file.
- `worker_process.log` : Logs engine inference data for each iteration.
- `prefix_cache_manager.log` : Records KV Cache logical index allocation for each request and cache hit status.
- `launch_worker.log` : Logs model startup information and error messages.
- `gpu_worker.log` : Records KV Cache block count information during profiling.
- `gpu_model_runner.log` : Contains model details and loading time.

## Online Inference Client Logs

- `api_server.log` : Logs startup parameters and received request information.

## Scheduler Logs

- `scheduler.log` : Records scheduler information, including node status and request allocation details.

## Speculative Decoding Logs

- `speculate.log` : Contains speculative decoding-related information.

## Prefix Caching Logs

- `cache_queue_manager.log` : Logs startup parameters and received request information.
- `cache_transfer_manager.log` : Logs startup parameters and received request information.
- `launch_cache_manager.log` : Records cache transfer startup parameters and error messages.

## PD Disaggregation Logs

- `cache_messager.log` : Logs transmission protocols and messages used by the P instance.
- `splitwise_connector.log` : Records data received from P/D instances and connection establishment details.

## CudaGraph Logs

- `cudagraph_piecewise_backend.log` : Logs CudaGraph startup and error information.