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Speed up network transfer for small buffers #8318

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Merged
fjetter merged 1 commit into from
Nov 6, 2023
Merged

Speed up network transfer for small buffers #8318

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7 changes: 5 additions & 2 deletions distributed/comm/tcp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -418,8 +418,11 @@ def _add_frames_header(
frames_nbytes = [header_nbytes, *frames_nbytes]
frames_nbytes_total += header_nbytes

if frames_nbytes_total < 2**17: # 128kiB
# small enough, send in one go
if frames_nbytes_total < 2**17 or ( # 128 kiB total
frames_nbytes_total < 2**25 # 32 MiB total
and frames_nbytes_total // len(frames) < 2**15 # 32 kiB mean
):
# very small or very fragmented; send in one go
frames = [b"".join(frames)]
frames_nbytes = [frames_nbytes_total]

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