evolution-gaming / sstream / 29936046492

39%

Build Type

push

Committed by web-flow

Commit Message

Reduce per-element boxing in core combinators (#234)

Rewrites `stateful`/`statefulM`/`flatMapLast` to thread state through
local mutable `var`s, cutting per-element allocation 16–23% B/op
(JMH-proven, `SyncIO` and `IO`). Code style is sacrificed for
performance; see the before/after table in
`StreamCombinatorBenchmark.scala:16`.

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Co-authored-by: sshevchenko <sshevchenko@evolution.com>
Co-authored-by: Mareks Rampāns <8796159+mr-git@users.noreply.github.com>

Coverage Stats

20 of 350 new or added lines in 3 files covered. (5.71%)

15 existing lines in 2 files now uncovered.

233 of 592 relevant lines covered (39.36%)

0.63 hits per line