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mise-pin zig 0.15.2; rebuild libghostty-vt ReleaseFast — 27-32x pipeline speedup

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Added .mise.toml pinning zig = "0.15.2" (the minimum the vendored
Ghostty commit requires) and taught the Makefile to resolve zig
through mise when available, falling back to PATH. Contributors run
`mise install` once and `make deps` just works.

Re-ran the pipeline benchmarks after rebuilding libghostty-vt with
ReleaseFast (same hardware, AMD Ryzen 7 7800X3D):

                                Debug         ReleaseFast    speedup
  Pipeline 8-colour @120fps     63 fps         2030 fps       32x
  Pipeline truecolor @120fps    34 fps          931 fps       27x
  Emulator-only truecolor       34 fps         2051 fps       60x

7-16x headroom over 120 fps for the heaviest workload (truecolor
full-screen redraws). Static library size 33 MiB -> 13 MiB.

TODO.md baseline numbers updated to reflect post-fix throughput;
the "Debug-mode lib" finding is folded into the result it produced
rather than left as an open item.
This commit is contained in:
Harry Bayliss
2026-05-15 13:54:48 +01:00
parent 2f109a84fa
commit bda799a3c6
4 changed files with 47 additions and 39 deletions
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15
Makefile
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@@ -31,10 +31,19 @@ deps-fetch: $(SOURCE)/.git/HEAD
# debug build of the upstream lib.
GHOSTTY_VT_OPTIMIZE ?= ReleaseFast
# Resolve zig via the project's mise pin (.mise.toml) when available,
# falling back to whatever's on PATH. mise keeps the zig version in
# lockstep with what the pinned ghostty commit requires; without it,
# contributors have to chase the version requirement themselves.
ZIG := $(shell command -v mise >/dev/null && mise which zig 2>/dev/null || command -v zig 2>/dev/null)
$(INSTALL)/lib/libghostty-vt.a: $(SOURCE)/.git/HEAD
@command -v zig >/dev/null || { echo "ERROR: zig not on PATH (need >=0.15.2 to build libghostty-vt)"; exit 1; }
@echo ">> building libghostty-vt with zig (optimize=$(GHOSTTY_VT_OPTIMIZE))"
@cd $(SOURCE) && zig build -Demit-lib-vt -Doptimize=$(GHOSTTY_VT_OPTIMIZE) --prefix $(INSTALL)
@if [ -z "$(ZIG)" ]; then \
echo "ERROR: zig not available. Run \`mise install\` (see .mise.toml — needs zig 0.15.2) or install zig manually."; \
exit 1; \
fi
@echo ">> building libghostty-vt with $(ZIG) (optimize=$(GHOSTTY_VT_OPTIMIZE))"
@cd $(SOURCE) && $(ZIG) build -Demit-lib-vt -Doptimize=$(GHOSTTY_VT_OPTIMIZE) --prefix $(INSTALL)
@test -f $(INSTALL)/lib/libghostty-vt.a || { echo "ERROR: expected static lib at $(INSTALL)/lib/libghostty-vt.a"; exit 1; }
@echo ">> libghostty-vt installed under $(INSTALL)"