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[Perf][Rust Frontend] Coalesce decoded chunks per engine update #55012

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Merged
njhill merged 1 commit into from
Sep 2, 2026
+7 −4
Merged

[Perf][Rust Frontend] Coalesce decoded chunks per engine update #55012

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11 changes: 7 additions & 4 deletions rust/src/text/src/output/decoded.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -201,11 +201,14 @@ pub async fn decoded_text_event_stream(

break;
}
}

// TODO: avoid generating a chunk every time a token is pushed
if intermediate && let Some(chunk) = decoder.next_chunk() {
decoded.append(chunk);
}
// Coalesce output per nonterminal engine update; terminal updates flush below.
if intermediate
&& finish_reason.is_none()
&& let Some(chunk) = decoder.next_chunk()
{
decoded.append(chunk);
}

let mut new_token_ids = output.token_ids;
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