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perf: move the mel buffer into the 1-item MelBatch instead of copying it - #67
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encode_16k and transcribe_16k_ctc_logits both assigned feats to mb1.data by copy. That branch is the long-audio path, where feats is n_mels * T floats (tens of MB for minutes of audio), so the copy doubles peak mel-buffer footprint for exactly the inputs where memory is tightest. feats is dead after the assignment on that branch: it is only read again by the encoder.forward() call in the else branch. Found by Coverity (COPY_INSTEAD_OF_MOVE) running over the copy of parakeet.cpp vendored in Firefox. Signed-off-by: Sylvestre Ledru <[email protected]> Assisted-by: Claude:claude-opus-5 [Claude Code]
mudler
approved these changes
Sep 26, 2026
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encode_16k and transcribe_16k_ctc_logits both assigned feats to mb1.data by copy. That branch is the long-audio path, where feats is n_mels * T floats (tens of MB for minutes of audio), so the copy doubles peak mel-buffer footprint for exactly the inputs where memory is tightest.
feats is dead after the assignment on that branch: it is only read again by the encoder.forward() call in the else branch.
Found by Coverity (COPY_INSTEAD_OF_MOVE) running over the copy of parakeet.cpp vendored in Firefox.
https://bugzilla.mozilla.org/show_bug.cgi?id=2069578
Assisted-by: Claude:claude-opus-5 [Claude Code]