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Auto merge of #109888 - Mark-Simulacrum:balanced-compression, r=pietroalbini

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Remove optimal xz settings from CI

This is a companion PR to rust-lang/promote-release#58, which moves the relevant optimal code to rust-lang/promote-release. As mentioned in the comments of that PR, this is expected to cut CI costs (and time, though predominantly felt on fast builders) and reduce wasted resources due to in-practice single-threaded compression not using the full 8+ vCPU builders we have available.

This probably shouldn't land before that PR + a simpleinfra change to enable the recompression of xz artifacts. But if it does land, it's just a matter of a few nightlies with slightly larger artifacts, so not a big deal.

r? `@pietroalbini`
This commit is contained in:
bors 2023-04-04 03:54:22 +00:00
commit bd991d9953
2 changed files with 13 additions and 46 deletions
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7
src/ci/run.sh
View File

@ -58,7 +58,12 @@ RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-manage-submodules"
RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-locked-deps"
RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-cargo-native-static"
RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.codegen-units-std=1"
RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set dist.compression-profile=best"
# rust-lang/promote-release will recompress CI artifacts, and while we care
# about the per-commit artifact sizes, it's not as important that they're
# highly compressed as it is that the process is fast. Best compression
# generally implies single-threaded compression which results in wasting most
# of our CPU resources.
RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set dist.compression-profile=balanced"
# When building for mingw, limit the number of parallel linker jobs during
# the LLVM build, as not to run out of memory.

52
src/tools/rust-installer/src/compression.rs
View File

@ -89,43 +89,11 @@ impl CompressionFormat {
xz2::stream::MtStreamBuilder::new().threads(6).preset(6).encoder().unwrap()
}
CompressionProfile::Best => {
let mut filters = xz2::stream::Filters::new();
// the preset is overridden by the other options so it doesn't matter
let mut lzma_ops = xz2::stream::LzmaOptions::new_preset(9).unwrap();
// This sets the overall dictionary size, which is also how much memory (baseline)
// is needed for decompression.
lzma_ops.dict_size(64 * 1024 * 1024);
// Use the best match finder for compression ratio.
lzma_ops.match_finder(xz2::stream::MatchFinder::BinaryTree4);
lzma_ops.mode(xz2::stream::Mode::Normal);
// Set nice len to the maximum for best compression ratio
lzma_ops.nice_len(273);
// Set depth to a reasonable value, 0 means auto, 1000 is somwhat high but gives
// good results.
lzma_ops.depth(1000);
// 2 is the default and does well for most files
lzma_ops.position_bits(2);
// 0 is the default and does well for most files
lzma_ops.literal_position_bits(0);
// 3 is the default and does well for most files
lzma_ops.literal_context_bits(3);
filters.lzma2(&lzma_ops);
let mut builder = xz2::stream::MtStreamBuilder::new();
builder.filters(filters);
// On 32-bit platforms limit ourselves to 3 threads, otherwise we exceed memory
// usage this process can take. In the future we'll likely only do super-fast
// compression in CI and move this heavyweight processing to promote-release (which
// is always 64-bit and can run on big-memory machines) but for now this lets us
// move forward.
if std::mem::size_of::<usize>() == 4 {
builder.threads(3);
} else {
builder.threads(6);
}
builder.encoder().unwrap()
// Note that this isn't actually the best compression settings for the
// produced artifacts, the production artifacts on static.rust-lang.org are
// produced by rust-lang/promote-release which hosts recompression logic
// and is tuned for optimal compression.
xz2::stream::MtStreamBuilder::new().threads(6).preset(9).encoder().unwrap()
}
};
@ -245,20 +213,14 @@ impl Write for CombinedEncoder {
}
fn flush(&mut self) -> std::io::Result<()> {
self.encoders
.par_iter_mut()
.map(|w| w.flush())
.collect::<std::io::Result<Vec<()>>>()?;
self.encoders.par_iter_mut().map(|w| w.flush()).collect::<std::io::Result<Vec<()>>>()?;
Ok(())
}
}
impl Encoder for CombinedEncoder {
fn finish(self: Box<Self>) -> Result<(), Error> {
self.encoders
.into_par_iter()
.map(|e| e.finish())
.collect::<Result<Vec<()>, Error>>()?;
self.encoders.into_par_iter().map(|e| e.finish()).collect::<Result<Vec<()>, Error>>()?;
Ok(())
}
}