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45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
---
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title: "Observability"
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metatags:
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description: "SGLang observability: Prometheus metrics, request logging, request dump and replay, crash dump debugging."
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---
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## Production Metrics
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SGLang exposes the following metrics via Prometheus. You can enable them by adding `--enable-metrics` when launching the server.
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You can query them by:
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```bash Command
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curl http://localhost:30000/metrics
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```
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See [Production Metrics](../references/production_metrics) and [Production Request Tracing](../references/production_request_trace) for more details.
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## Logging
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By default, SGLang does not log any request contents. You can log them by using `--log-requests`.
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You can control the verbosity by using `--log-request-level`.
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See [Logging](./server_arguments#logging) for more details.
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You can change verbosity at runtime:
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```bash Command
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python3 -m sglang.srt.managers.configure_logging --url http://localhost:30000 --log-level=debug
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```
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## Request Dump and Replay
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You can dump all requests and replay them later for benchmarking or other purposes.
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To start dumping, use the following command to send a request to a server:
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```bash Command
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python3 -m sglang.srt.managers.configure_logging --url http://localhost:30000 --dump-requests-folder /tmp/sglang_request_dump --dump-requests-threshold 100
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```
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The server will dump the requests into a pickle file for every 100 requests.
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To replay the request dump, use `scripts/playground/replay_request_dump.py`.
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## Crash Dump and Replay
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Sometimes the server might crash, and you may want to debug the cause of the crash.
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SGLang supports crash dumping, which will dump all requests from the 5 minutes before the crash, allowing you to replay the requests and debug the reason later.
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To enable crash dumping, use `--crash-dump-folder /tmp/crash_dump`.
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To replay the crash dump, use `scripts/playground/replay_request_dump.py`.
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