95 lines
4.6 KiB
TOML
95 lines
4.6 KiB
TOML
[workspace]
|
|
resolver = "2"
|
|
members = [
|
|
"crates/quicksearch-core",
|
|
"crates/quicksearch-gui",
|
|
]
|
|
|
|
[workspace.package]
|
|
version = "1.1.0"
|
|
edition = "2021"
|
|
license = "GPL-3.0-or-later"
|
|
authors = ["Jeremy <jeremy@karsttech.com>"]
|
|
repository = "https://code.karsttech.com/jeremy/quick_search.git"
|
|
|
|
# Fat LTO, one codegen unit. This reverses an earlier decision, so both
|
|
# measurements are kept: the old one was right about what it measured, and it
|
|
# measured the wrong axis on the wrong kind of build.
|
|
#
|
|
# WHAT WAS MEASURED BEFORE, against an *incremental* rebuild of the GUI after
|
|
# touching core (10.2 s at the defaults):
|
|
#
|
|
# lto=thin 67 s search cold 29.9 ms warm best 14.77 ms index cold 459 ms
|
|
# lto=thin,cgu=1 152 s (build cost alone ruled it out)
|
|
# lto=fat,cgu=1 200 s search cold 29.2 ms warm best 14.57 ms index cold 479 ms
|
|
# (defaults) 10 s search cold 30.0 ms warm best 14.92 ms index cold 478 ms
|
|
#
|
|
# It concluded that the runtime gain was at the noise floor against a 6.6-19.5x
|
|
# longer build. Two things were wrong with that as a decision:
|
|
#
|
|
# * It never weighed SIZE, which turns out to be where the effect is.
|
|
# * A 10 s incremental rebuild is the worst possible denominator for a
|
|
# link-time optimization, because the LTO link is nearly the whole cost and
|
|
# there is no compile phase to amortize it against. CI never builds that
|
|
# way; it builds clean.
|
|
#
|
|
# RE-MEASURED CLEAN, on 6 cores, stripped `target/*/quicksearch`:
|
|
#
|
|
# stripped vs def search cold warm best index cold
|
|
# (defaults) 28,248,272 - 28.2 ms 14.7 ms 445 ms
|
|
# cgu=1 25,909,616 -8.3% 28.6 ms 14.8 ms 452 ms
|
|
# lto=thin 28,233,296 -0.1% (not run: no size effect)
|
|
# lto=thin,cgu=1 25,991,536 -8.0% (not run: worse than cgu=1 alone)
|
|
# lto=fat,cgu=1 24,284,912 -14.0% 27.3 ms 14.1 ms 443 ms
|
|
#
|
|
# Search is best of three runs; the spreads overlap, so read fat as "3-4%
|
|
# faster or even", never as a regression. It is both the fastest and by far the
|
|
# smallest, which is why it wins outright.
|
|
#
|
|
# Two surprises worth keeping. `codegen-units = 1` ALONE is worth 2.3 MB - the
|
|
# old table never isolated it, because every cgu=1 row there also carried LTO.
|
|
# And `lto = "thin"` alone is worth nothing at all (0.1%), while thin+cgu=1 is
|
|
# slightly *worse* than cgu=1 by itself. Thin is not a cheaper fat here; it is
|
|
# a different, useless thing.
|
|
#
|
|
# BUILD COST, clean, 6 cores. The second column is what CI actually pays on top
|
|
# of the binaries, since `cargo test --release --workspace` links every test,
|
|
# example and bin target - `--release` is `--profile=release`, so this profile
|
|
# is theirs too:
|
|
#
|
|
# bins + all test targets total
|
|
# (defaults) 143 s 28 s 171 s
|
|
# cgu=1 158 s 41 s 199 s
|
|
# lto=fat,cgu=1 198 s 100 s 298 s
|
|
#
|
|
# So +127 s on a clean CI run, not the tens of minutes the incremental figure
|
|
# above implies. Test targets link cheaply because they are small; it is the
|
|
# 320-crate dependency compile that dominates, and cgu=1 spreads across cores.
|
|
#
|
|
# WHAT IS DELIBERATELY NOT SET:
|
|
#
|
|
# `strip` would save nothing shipped. The packaging scripts and ci.yml strip the
|
|
# staged *copy*, which keeps `target/release/` symbolised for `perf` and for the
|
|
# RUST_BACKTRACE=1 release-test backtraces CI prints, and keeps `--no-strip` on
|
|
# build-deb.sh and build-appimage.sh meaning something. Setting it here would
|
|
# move the same 6.5 MB saving to a place where it costs debuggability.
|
|
#
|
|
# `panic = "abort"` is the largest win left - it would delete `.gcc_except_table`
|
|
# (428 KB after LTO) and most of `.eh_frame` (1.33 MB) - and is unavailable for
|
|
# two independent reasons. `extract/pdf.rs` runs `pdf-extract` inside
|
|
# `catch_unwind`, so aborting would turn a malformed PDF into a killed process
|
|
# instead of one skipped file. And cargo forces every dependency to rebuild with
|
|
# unwind when building tests under an abort profile, so `cargo test --release`
|
|
# would compile the whole graph a second time.
|
|
#
|
|
# Non-PIE would remove most of `.rela.dyn` (1.37 MB) and is rejected on
|
|
# hardening grounds: this program parses arbitrary user PDFs with a crate known
|
|
# to panic on malformed input, which is the last place to give up ASLR.
|
|
#
|
|
# The vendored OpenSSL (~1.3 MB of `.text`, via SQLCipher) is unreachable by any
|
|
# profile knob - `openssl-src` pins its own `-O2` - and dropping it would add a
|
|
# runtime `libcrypto` dependency, which is exactly what the AppImage's
|
|
# bundles-no-libraries invariant forbids.
|
|
[profile.release]
|
|
lto = "fat"
|
|
codegen-units = 1
|