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Mac push: Opening a long chat no longer holds ~730 MB (from #2045) #2060
Description
This draft was closed, unmerged, when the 2026-10-29 Mac stability and performance push was stopped early to save usage. Its branch is kept: reopen the PR or start from the branch, rebase onto the latest base, and finish the steps below.
PR: #2045 (session: an opened chat lets go of the journal lines it replayed)
Branch: perf/engine-long-chat-memory
What it fixes. Opening a 1,376-entry chat made the engine hold ~730 MB (73 MB listed but not opened) and the first page took 1.1 s. The fix, chosen after a heap profile, is in internal/session; there is no wire change.
Done. Heap attribution and the internal/session change.
Left. An s7 before/after plus the long-chat A/B; touched-package and importer gates; a Codex round; CI comparison.
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AbirAbbas commentedon Nov 2, 2026
Merged in #2045 (squash 86ebdda on app/v3), rebased onto app/v3 f7422fb. CI on the rebased head (PR gate and Full check) failed only on tests that also fail on the app/v3 baseline, or that flaked on unrelated branches in the same rounds. Code review of the rebased head: no findings. Not yet exercised on a real Mac: nothing Mac-specific; the long-chat memory reading on the Mac is still to take.