lix-releng-staging/Makefile
eldritch horrors 3c52344300 out with the -O3, in with the -O2
-O3 does not measurably improve performance of the resulting binaries,
neither with lto enabled nor with lto disabled. what it does to however
is cause gcc warning spew in libstdc++ that we can't do anything
about (and that upon inspection of libstdc++ source looks like a gcc
bug).

with lto, -O3:

Benchmark 1: GC_INITIAL_HEAP_SIZE=10g nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      4.608 s ±  0.027 s    [User: 3.866 s, System: 0.522 s]
    Range (min … max):    4.579 s …  4.640 s    10 runs

Benchmark 2:  nix eval -f <nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix>
    Time (mean ± σ):     408.1 ms ±  25.5 ms    [User: 360.0 ms, System: 28.1 ms]
    Range (min … max):   387.6 ms … 439.0 ms    10 runs

with lto, -O2:

Benchmark 1: GC_INITIAL_HEAP_SIZE=10g nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      4.632 s ±  0.044 s    [User: 3.874 s, System: 0.544 s]
    Range (min … max):    4.563 s …  4.673 s    10 runs

Benchmark 2:  nix eval -f <nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix>
    Time (mean ± σ):     394.0 ms ±  23.9 ms    [User: 351.2 ms, System: 27.6 ms]
    Range (min … max):   377.8 ms … 429.3 ms    10 runs

without lto, -O3:

Benchmark 1: GC_INITIAL_HEAP_SIZE=10g nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      4.700 s ±  0.024 s    [User: 3.906 s, System: 0.559 s]
    Range (min … max):    4.663 s …  4.717 s    10 runs

Benchmark 2:  nix eval -f <nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix>
    Time (mean ± σ):     400.4 ms ±  25.6 ms    [User: 353.7 ms, System: 26.8 ms]
    Range (min … max):   379.8 ms … 430.6 ms    10 runs

without lto, -O2:

Benchmark 1: GC_INITIAL_HEAP_SIZE=10g nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      4.724 s ±  0.030 s    [User: 3.924 s, System: 0.570 s]
    Range (min … max):    4.687 s …  4.749 s    10 runs

Benchmark 2:  nix eval -f <nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix>
    Time (mean ± σ):     392.4 ms ±  24.3 ms    [User: 350.9 ms, System: 26.4 ms]
    Range (min … max):   376.9 ms … 428.0 ms    10 runs

fixes #46

Change-Id: Ib8afad8a07c278f57f2e3317d00cce4f9ec0f338
2024-03-15 15:31:49 -06:00

73 lines
1.7 KiB
Makefile

include mk/build-dir.mk
-include $(buildprefix)Makefile.config
clean-files += $(buildprefix)Makefile.config
ifeq ($(ENABLE_BUILD), yes)
makefiles = \
mk/precompiled-headers.mk \
local.mk \
src/libutil/local.mk \
src/libstore/local.mk \
src/libfetchers/local.mk \
src/libmain/local.mk \
src/libexpr/local.mk \
src/libcmd/local.mk \
src/nix/local.mk \
src/resolve-system-dependencies/local.mk \
scripts/local.mk \
misc/bash/local.mk \
misc/fish/local.mk \
misc/zsh/local.mk \
misc/systemd/local.mk \
misc/launchd/local.mk \
misc/upstart/local.mk
endif
ifeq ($(ENABLE_BUILD)_$(ENABLE_TESTS), yes_yes)
UNIT_TEST_ENV = _NIX_TEST_UNIT_DATA=unit-test-data
makefiles += \
tests/unit/libutil/local.mk \
tests/unit/libutil-support/local.mk \
tests/unit/libstore/local.mk
endif
ifeq ($(ENABLE_TESTS), yes)
makefiles += \
tests/unit/libstore-support/local.mk \
tests/unit/libexpr/local.mk \
tests/unit/libexpr-support/local.mk \
tests/functional/local.mk \
tests/functional/ca/local.mk \
tests/functional/dyn-drv/local.mk \
tests/functional/test-libstoreconsumer/local.mk \
tests/functional/repl_characterization/local.mk \
tests/functional/plugins/local.mk
else
makefiles += \
mk/disable-tests.mk
endif
# Some makefiles require access to built programs and must be included late.
makefiles-late =
ifeq ($(ENABLE_BUILD), yes)
makefiles-late += doc/manual/local.mk
makefiles-late += doc/internal-api/local.mk
endif
# Miscellaneous global Flags
OPTIMIZE = 1
ifeq ($(OPTIMIZE), 1)
GLOBAL_CXXFLAGS += -O2 $(CXXLTO)
GLOBAL_LDFLAGS += $(CXXLTO)
else
GLOBAL_CXXFLAGS += -O0 -U_FORTIFY_SOURCE
endif
include mk/lib.mk
GLOBAL_CXXFLAGS += -g -Wall -Wimplicit-fallthrough -include $(buildprefix)config.h -std=c++2a -I src