d71ca589

fix: install ReleaseSafe, so `yes` is not 600x slower than tmux

a73x 2026-08-21 12:30

Commit message

fix: install ReleaseSafe, so `yes` is not 600x slower than tmux

ghostty gates its page-integrity check on ITS OWN optimize mode, and the
check is not cheap: a hash map rebuilt over every cell plus a fresh
DebugAllocator, on every page mutation. `install` depended on `build`,
which is Debug, so ~/.local/bin got that. 20k lines of `yes` at 80x24,
no client attached: 3713ms installed, 6ms ReleaseSafe, 6ms tmux, 24ms a
bare pty. perf put 96% of muxd's cycles in verifyIntegrity and its hash
map.

The dev tree stays Debug on purpose — the integrity assertions are worth
having while working on the engine. Only what lands on PATH changes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JDnJ6v15RvwZ2Y3zvfrWpR

Makefile

Old		New
@@ -20,9 +20,22 @@ build:
20	# (ptyclient, wsclient, rawmode, ...) is a test fixture that would shadow	20	# (ptyclient, wsclient, rawmode, ...) is a test fixture that would shadow
21	# nothing useful on PATH.	21	# nothing useful on PATH.
22	BINDIR ?= $(HOME)/.local/bin	22	BINDIR ?= $(HOME)/.local/bin
23	install: build	23	# ReleaseSafe, like `release` — not the Debug tree `build` leaves in
		24	# zig-out. ghostty gates its page-integrity check on ITS optimize mode, and
		25	# in Debug that check rebuilds a hash map over every cell (and stands up a
		26	# fresh DebugAllocator) on every page mutation: 20k lines of `yes` took
		27	# 3713ms against 6ms ReleaseSafe, tmux 6ms. Nobody wants that on PATH.
		28	#
		29	# Staged in its own prefix because a `-Doptimize=` build would otherwise
		30	# overwrite zig-out/bin, leaving the dev tree's binaries and test fixtures
		31	# silently not the ones `make test` just built — the same trap xversion-build
		32	# documents below.
		33	INSTDIR ?= dist/install
		34	install:
		35	$(ZIG) build -Doptimize=ReleaseSafe -p $(INSTDIR)
24	install -d $(BINDIR)	36	install -d $(BINDIR)
25	install -m755 zig-out/bin/muxd zig-out/bin/mux zig-out/bin/muxa zig-out/bin/muxweb $(BINDIR)/	37	install -m755 $(INSTDIR)/bin/muxd $(INSTDIR)/bin/mux \
		38	$(INSTDIR)/bin/muxa $(INSTDIR)/bin/muxweb $(BINDIR)/
26		39
27	# The artifact a release publishes, built the way every release since	40	# The artifact a release publishes, built the way every release since
28	# v0.0.1-4 has been: static musl so one binary runs on any x86_64 Linux,	41	# v0.0.1-4 has been: static musl so one binary runs on any x86_64 Linux,