Heuristic:Triton inference server Server Server Default Configuration
| Knowledge Sources | |
|---|---|
| Domains | Infrastructure, Inference_Serving |
| Last Updated | 2026-02-13 17:00 GMT |
Overview
Reference for Triton server default configuration values including port assignments (8000/8001/8002), thread counts, timeout values, and buffer sizes that are not obvious from documentation alone.
Description
The Triton Inference Server has many configurable parameters with carefully chosen defaults. These defaults are scattered across command_line_parser.cc and related header files. Understanding them is critical for deployment planning (firewall rules, load balancer configuration, resource allocation) and troubleshooting (timeout mismatches, connection drops).
Key defaults include the three-port architecture (HTTP 8000, gRPC 8001, Metrics 8002), gRPC keepalive settings tuned for long-running connections, and conservative thread counts that may need adjustment for high-throughput deployments.
Usage
Use this reference when configuring Triton for production deployment, debugging connection issues (especially gRPC keepalive/timeout problems), or sizing infrastructure (load balancer timeouts must exceed Triton's keepalive settings).
The Insight (Rule of Thumb)
Port Assignments:
- HTTP port: 8000 (--http-port)
- gRPC port: 8001 (--grpc-port)
- Metrics port: 8002 (--metrics-port)
- SageMaker port: 8080 (--sagemaker-port)
- All bind to: 0.0.0.0 by default
Thread Counts:
- gRPC inference threads: 2 (--grpc-infer-thread-count)
- SageMaker threads: 8 (--sagemaker-thread-count)
- Vertex AI threads: 8 (--vertex-ai-thread-count)
- Model load threads: 4 (--model-load-thread-count)
- Model load retries: 0 (--model-load-retry-count)
gRPC Keepalive Settings:
- Keepalive time: 7,200,000 ms = 2 hours (--grpc-keepalive-time)
- Keepalive timeout: 20,000 ms = 20 seconds (--grpc-keepalive-timeout)
- Max pings without data: 2 (--grpc-http2-max-pings-without-data)
- Min ping interval without data: 300,000 ms = 5 minutes (--grpc-http2-min-recv-ping-interval-without-data)
- Max ping strikes: 2 (--grpc-http2-max-ping-strikes)
Buffer and Size Limits:
- HTTP max input size: 67,108,864 bytes = 64 MB (--http-max-input-size)
- Metrics interval: 2,000 ms (--metrics-interval-ms)
- Response cache default: 1,048,576 bytes = 1 MB
Trade-off: The default gRPC keepalive of 2 hours is very conservative and may cause issues with proxies/load balancers that have shorter idle timeouts. Adjust --grpc-keepalive-time if connections drop unexpectedly.
Reasoning
The three-port architecture separates concerns: HTTP for inference clients, gRPC for high-performance clients, and a dedicated metrics port for monitoring systems (Prometheus). This prevents monitoring traffic from competing with inference traffic.
The gRPC keepalive defaults follow gRPC best practices for server-side settings: a long keepalive time (2 hours) avoids unnecessary ping traffic, while the 20-second timeout detects dead connections quickly once a keepalive is sent. The ping strike limit (2) prevents misbehaving clients from overwhelming the server.
The 64 MB HTTP input size limit protects against accidentally sending extremely large payloads. For models with large inputs (images, audio), this may need to be increased.
Source evidence from src/command_line_parser.cc:484-505:
// HTTP port default: 8000
// HTTP address default: 0.0.0.0
// HTTP max input size: 67108864 bytes (64MB)
Source evidence from src/command_line_parser.cc:582-619:
// grpc-keepalive-time: Default is 7200000 (2 hours)
// grpc-keepalive-timeout: Default is 20000 (20 seconds)
// grpc-http2-max-pings-without-data: Default is 2
// grpc-http2-min-recv-ping-interval-without-data: Default is 300000 (5 min)
// grpc-http2-max-ping-strikes: Default is 2