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Revert "perf: disable snapshot compression (#18061)" (#18074)

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This reverts commit d12b039e1a.

It was landed as an experiment and it confirms much faster startup
if not compression is applied.
This commit is contained in:
Bartek Iwańczuk 2023-03-08 11:44:04 -04:00 • committed by GitHub
parent 88b5fd9088
commit 0e8fc4dc6c
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 75 additions and 7 deletions
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33
runtime/js.rs
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@ -1,14 +1,43 @@
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
use deno_core::Snapshot;
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
use log::debug;
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
use once_cell::sync::Lazy;
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
static RUNTIME_SNAPSHOT: &[u8] =
static COMPRESSED_RUNTIME_SNAPSHOT: &[u8] =
include_bytes!(concat!(env!("OUT_DIR"), "/RUNTIME_SNAPSHOT.bin"));
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
pub static RUNTIME_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
#[allow(clippy::uninit_vec)]
#[cold]
#[inline(never)]
|| {
let size =
u32::from_le_bytes(COMPRESSED_RUNTIME_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_RUNTIME_SNAPSHOT[4..], &mut vec)
.unwrap();
vec.into_boxed_slice()
},
);
#[cfg(not(feature = "dont_create_runtime_snapshot"))]
pub fn deno_isolate_init() -> Snapshot {
Snapshot::Static(RUNTIME_SNAPSHOT)
debug!("Deno isolate init with snapshots.");
Snapshot::Static(&RUNTIME_SNAPSHOT)
}
#[cfg(not(feature = "include_js_files_for_snapshotting"))]