Eli Zaretskii writes: >> From: Helmut Eller >> Date: Sun, 31 Aug 2025 11:21:41 +0200 >> >> On Sun, Aug 31 2025, Eli Zaretskii wrote: >> >> >> It looks like the bug is in ArenaStep: it should divide the by >> >> clocks_per_second before calling PolicyShouldCollectWorld. >> > >> > What does this affect in Emacs? >> >> This affects how often MPS begins opportunistic GC, i.e. it affects only >> sessions where igc-step-interval > 0. >> >> Because of the bug, full collections are started more frequently because >> availableTime > collectionTime is true more often. (availableTime is >> 10^6 times bigger than it should be.) >> >> The documentation of PolicyShouldCollectWorld says that it starts a full >> collection only if it expects that the full collection can be completed >> within availableTime (= igc-step-interval) and if enough time (= per >> process time) has passed since the last full collection. >> >> > And is this relevant to using a non-debug build of the library? >> >> Yes. > > OK, thanks. I guess it will be interesting to see what happens if > people use a patched MPS with this bug fixed. Good find, Helmut. There used to be a comment in arena_step wondering what's going on, but it got removed, apparently. Does this look right?