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Code Issues Packages 1 Wiki Activity

chore(build): don't compress TSC snapshot in debug build (#17772)

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Compressing the TSC snapshot in debug build took
~45s on M1 MacBook Pro; without compression it took ~1s.
Thus we're not not using compressed snapshot, trading off
a lot of build time for some startup time in debug build.
This commit is contained in:
Bartek Iwańczuk 2023-02-14 02:46:32 +01:00 committed by GitHub
parent 0f1349bca8
commit 2502a37d41
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 29 additions and 7 deletions
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10
cli/build.rs
View file

@ -280,7 +280,17 @@ mod ts {
startup_snapshot: None,
extensions: vec![],
extensions_with_js: vec![tsc_extension],
// NOTE(bartlomieju): Compressing the TSC snapshot in debug build took
// ~45s on M1 MacBook Pro; without compression it took ~1s.
// Thus we're not not using compressed snapshot, trading off
// a lot of build time for some startup time in debug build.
#[cfg(debug_assertions)]
compression_cb: None,
#[cfg(not(debug_assertions))]
compression_cb: Some(Box::new(|vec, snapshot_slice| {
eprintln!("Compressing TSC snapshot...");
vec.extend_from_slice(
&zstd::bulk::compress(snapshot_slice, 22)
.expect("snapshot compression failed"),

8
cli/tsc/mod.rs
View file

@ -56,6 +56,14 @@ pub static COMPILER_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
static COMPRESSED_COMPILER_SNAPSHOT: &[u8] =
include_bytes!(concat!(env!("OUT_DIR"), "/COMPILER_SNAPSHOT.bin"));
// NOTE(bartlomieju): Compressing the TSC snapshot in debug build took
// ~45s on M1 MacBook Pro; without compression it took ~1s.
// Thus we're not not using compressed snapshot, trading off
// a lot of build time for some startup time in debug build.
#[cfg(debug_assertions)]
return COMPRESSED_COMPILER_SNAPSHOT.to_vec().into_boxed_slice();
#[cfg(not(debug_assertions))]
zstd::bulk::decompress(
&COMPRESSED_COMPILER_SNAPSHOT[4..],
u32::from_le_bytes(COMPRESSED_COMPILER_SNAPSHOT[0..4].try_into().unwrap())

18
core/snapshot_util.rs
View file

@ -2,6 +2,7 @@
use std::path::Path;
use std::path::PathBuf;
use std::time::Instant;
use crate::Extension;
use crate::InternalModuleLoaderCb;
@ -22,7 +23,8 @@ pub struct CreateSnapshotOptions {
}
pub fn create_snapshot(create_snapshot_options: CreateSnapshotOptions) {
let start = std::time::Instant::now();
let mut mark = Instant::now();
let js_runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
startup_snapshot: create_snapshot_options.startup_snapshot,
@ -35,11 +37,12 @@ pub fn create_snapshot(create_snapshot_options: CreateSnapshotOptions) {
let snapshot = js_runtime.snapshot();
let snapshot_slice: &[u8] = &snapshot;
println!(
"Snapshot size: {}, took {}s ({})",
"Snapshot size: {}, took {:#?} ({})",
snapshot_slice.len(),
start.elapsed().as_secs_f64(),
Instant::now().saturating_duration_since(mark),
create_snapshot_options.snapshot_path.display()
);
mark = Instant::now();
let maybe_compressed_snapshot: Box<dyn AsRef<[u8]>> =
if let Some(compression_cb) = create_snapshot_options.compression_cb {
@ -54,11 +57,12 @@ pub fn create_snapshot(create_snapshot_options: CreateSnapshotOptions) {
(compression_cb)(&mut vec, snapshot_slice);
println!(
"Snapshot compressed size: {}, took {}s ({})",
"Snapshot compressed size: {}, took {:#?} ({})",
vec.len(),
start.elapsed().as_secs_f64(),
Instant::now().saturating_duration_since(mark),
create_snapshot_options.snapshot_path.display()
);
mark = std::time::Instant::now();
Box::new(vec)
} else {
@ -71,9 +75,9 @@ pub fn create_snapshot(create_snapshot_options: CreateSnapshotOptions) {
)
.unwrap();
println!(
"Snapshot written to: {}, took: {}s",
"Snapshot written, took: {:#?} ({})",
Instant::now().saturating_duration_since(mark),
create_snapshot_options.snapshot_path.display(),
start.elapsed().as_secs_f64()
);
}