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perf: disable snapshot compression (#18061)

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This commit disables snapshot compression for the CLI snapshot.]

Decompressing the snapshot on startup takes ~2.5ms.
This commit is contained in:
Bartek Iwańczuk 2023-03-07 08:57:58 -04:00 • committed by GitHub
parent fe368b72c1
commit d12b039e1a
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 7 additions and 75 deletions
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31
cli/js.rs
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@ -1,37 +1,12 @@
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use deno_core::Snapshot;
use log::debug;
use once_cell::sync::Lazy;
pub static CLI_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
#[allow(clippy::uninit_vec)]
#[cold]
#[inline(never)]
|| {
static COMPRESSED_CLI_SNAPSHOT: &[u8] =
include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
let size =
u32::from_le_bytes(COMPRESSED_CLI_SNAPSHOT[0..4].try_into().unwrap())
as usize;
let mut vec = Vec::with_capacity(size);
// SAFETY: vec is allocated with exact snapshot size (+ alignment)
// SAFETY: non zeroed bytes are overwritten with decompressed snapshot
unsafe {
vec.set_len(size);
}
lzzzz::lz4::decompress(&COMPRESSED_CLI_SNAPSHOT[4..], &mut vec).unwrap();
vec.into_boxed_slice()
},
);
static CLI_SNAPSHOT: &[u8] =
include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
pub fn deno_isolate_init() -> Snapshot {
debug!("Deno isolate init with snapshots.");
Snapshot::Static(&CLI_SNAPSHOT)
Snapshot::Static(CLI_SNAPSHOT)
}
#[cfg(test)]