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When context takeover is disabled, a zlib stream is reset after each message
and carries nothing over to the next one. Instead of keeping its deflate and
inflate streams for its whole lifetime, a connection now takes a stream from a
pool when a message starts and returns it after the last fragment. Pools are
keyed by the `zlib{Deflate,Inflate}Options` objects and the window size, and
hold at most `concurrencyLimit` streams.
With 1,000 connections that each sent and received one compressed message, the
memory used per connection on the server dropped from about 267 KiB to about
31 KiB. The compressed output does not change.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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When context takeover is disabled, a zlib stream is reset after each message and carries nothing over to the next one. Instead of keeping its deflate and inflate streams for its whole lifetime, a connection now takes a stream from a pool when a message starts and returns it after the last fragment. Pools are keyed by the
zlib{Deflate,Inflate}Optionsobjects and the window size, and hold at mostconcurrencyLimitstreams.With 1,000 connections that each sent and received one compressed message, the memory used per connection on the server dropped from about 267 KiB to about 31 KiB. The compressed output does not change.