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Use 3 or 6 compression threads for rust-installer

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Limit to 3 threads for 32-bit platforms, otherwise we use 6 threads.
This avoids exceeding the amount of memory we can allocate on a 32-bit
platform.
This commit is contained in:
Mark Rousskov 2023-02-28 21:19:43 -05:00
parent ddc2d1e806
commit dabafb44e0
1 changed files with 16 additions and 5 deletions
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21
src/tools/rust-installer/src/compression.rs
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@ -61,13 +61,24 @@ impl CompressionFormat {
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);
}
let compressor = XzEncoder::new_stream(
std::io::BufWriter::new(file),
xz2::stream::MtStreamBuilder::new()
.threads(1)
.filters(filters)
.encoder()
.unwrap(),
builder.encoder().unwrap(),
);
Box::new(compressor)
}