[None] [doc] Add Mixed Precision Context and Generation section to Disagg

[timothygao8710]

@coderabbitai summary

Description

This PR updates the Disaggregated Serving README to document how to run context and generation servers in mixed-precision using model opt. An example usage for BF16 prefill + FP8 decode is included.

Test Coverage

Performance and accuracy tests were run for FP8 and NVFP4 with llama 3.1 8B base model on GSM8k and MMLU, with 1 Ctx/Gen Server. Example:

FP16/16 (2xH100):
"results": { "gsm8k": { "alias": "gsm8k", "exact_match,strict-match": 0.7558756633813495, "exact_match_stderr,strict-match": 0.011832404674077592, "exact_match,flexible-extract": 0.7839272175890827, "exact_match_stderr,flexible-extract": 0.011336531489638858 } },

"start_time": 34733.35253426, "end_time": 35711.569743744, "total_evaluation_time_seconds": "978.2172094840062"

FP16/8 (2xH100):
"results": { "gsm8k": { "alias": "gsm8k", "exact_match,strict-match": 0.7354056103108415, "exact_match_stderr,strict-match": 0.012150554001563231, "exact_match,flexible-extract": 0.7626990144048522, "exact_match_stderr,flexible-extract": 0.011718409178739442 } },
"start_time": 33387.524966359, "end_time": 34123.906708314, "total_evaluation_time_seconds": "736.3817419550032"

PR Checklist

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[achartier]

No need to specify prefill/decode, the terms are not used in the rest of the document.

[timothygao8710]

Changed!

[achartier]

prefill workers are more compute-bound while decode workers are more memory-bound.

Use context / generation as well here. Remove 'more'

[timothygao8710]

Changed!