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Reducing TTFT by CPUMaxxing Tokenization

Crusoe and NVIDIA Dynamo developed fastokens, an open-source Rust BPE tokenizer that achieves a 9.1× average speedup over HuggingFace and up to 40% faster TTFT on long-context workloads.

SourceHacker News AIAuthor: intrepidsoldier
Reducing TTFT by CPUMaxxing Tokenization
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Key points

  • fastokens delivers 9.1× average speedup, up to 31× on long prompts.
  • Optimizations include parallel pre-tokenization, two-level caching, and dynamic memory management.
  • Open-source and integrates with NVIDIA Dynamo and SGLang, supporting many popular models.
  • On GB200 NVL72, 100K token latency drops from 149-165ms to 6-13ms, a >92% reduction.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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