feat: enable JSON output by Arno500 · Pull Request #22 · huggingface/gpu-fryer

Arno500 · 2026-02-05T13:55:49Z

I rewrote most of the logging system. This allows to have proper JSON output for parsing by external program. There is a few standardized types that will limit the amount of structures required to implement.

The original text output is kept mostly as-is, except for the problem output, since it was not coherent depending on the problem. Some log lines (log_raw) are kept as-is because I was too lazy to implement them as JSON and they probably do not have that much value when used programmatically.

Serde could have been made optional, but it would have made the code more complicated and most of the dependencies are already there anyway.

Arno500 · 2026-02-05T14:01:19Z

Here is a sample output:

cargo run -- --json

{"type":"detected_gpus","detected_gpus":[{"index":0,"name":"Tesla V100-PCIE-16GB","uuid":"ace03226-4b45-24c9-7ceb-2acf6c3bd2ad"},{"index":1,"name":"Tesla V100-PCIE-16GB","uuid":"2d1b21c2-9f4c-3413-6d8c-0fe2780096c9"}]}
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Arno500 · 2026-03-16T15:29:51Z

Hi @Hugoch it's now been more than a month, would you have a bit of time to review that? 🙏🏻
Thanks a lot!

Hugoch · 2026-03-17T09:29:58Z

Hey @Arno500 ! Thanks a lot for the contribution!

Do you have a clear use case of the JSON output as part of logging? I totally understand the need for a final JSON report for parsing (similar as #17) , but I'm not sure there's much value in parsing the ongoing burn?

Arno500 · 2026-03-17T09:49:43Z

Hi again!
Indeed! We're developping a software called "hwbench" where the goal is to be able to orchestrate multiple benchmarks to evaluate performance, consistency and environments of the machines that we test or buy. Since we're buying more and more GPU-based machines, we need to have a way to verify the behaviors of GPU as well.

gpu-fryer is definitely our go-to tool for this. But to orchestrate it, if we want to collect metrics as they come and follow the state, we definitely need a way to parse the output. We could have parsed "the old way", but it's really annoying to do and inconsistent whereas with the change we can just parse the JSON as-is in any language. (there are also the issues where the output format changes with the update, "oops, we added a line jump there because it was looking better", etc.)
In this specific case, being able to follow throttling events, etc. is crucial, since we collect and log everything to be able to graph the data afterwards with hwgraph.

Arno500 · 2026-03-17T17:02:24Z

Thank you for the thorough review. I did correct all the suggestions

Hugoch

Thanks for the edits! A few more remarks and we should be good to merge :)

I rewrote most of the logging system. This allows to have proper JSON output for parsing by external program. There is a few standardized types that will limit the amount of structures required to implement. The original text output is kept mostly as-is, except for the `problem` output, since it was not coherent depending on the problem. Some log lines (`log_raw`) are kept as-is because I was too lazy to implement them as JSON and they probably do not have that much value when used programmatically.

Hugoch

Thanks for all the modification @Arno500 ! Let's 🚀

Arno500 · 2026-03-23T12:51:48Z

I let you merge whenever!

Hugoch reviewed Mar 17, 2026

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Arno500 force-pushed the main branch from 7b73fb5 to e4e5fbb Compare March 17, 2026 17:01

Hugoch reviewed Mar 18, 2026

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Arno500 force-pushed the main branch from e4e5fbb to 5650fe4 Compare March 20, 2026 10:02

Hugoch approved these changes Mar 23, 2026

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Hugoch merged commit edd3ba1 into huggingface:main Mar 23, 2026
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