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Issue #53738 describes in detail how switching to using the actual trigger point over the precomputed trigger causes a memory regression, that arises from the fact that the PI controller in front of the cons/mark ratio has a long time constant (for overdamping), so it retains a long history of inputs. This change, for the Go 1.19 cycle, just reverts to using the precomputed trigger because it's safer, but in the future we should consider moving away from such a history-sensitive smoothing function. See the big comment in the diff and #53738 for more details. Performance difference vs. 1.18 after this change: https://perf.golang.org/search?q=upload:20220714.15 Fixes #53738. Change-Id: I636993a730a3eaed25da2a2719860431b296c6f9 Reviewed-on: https://go-review.googlesource.com/c/go/+/417557 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> |
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