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build: disable v8 snapshot compression by default

Browse Source 
In the upstream, V8 also disables snapshot compression on the
desktop by default because the size reduction is not worth the
performance hit.
https://chromium-review.googlesource.com/c/v8/v8/+/3275554

Locally the binary size of Node.js is increased by ~2.7MB
(+3.2%) with a significant speedup in startup after snapshot
compression is disabled on macOS.

Also adds a --v8-enable-snapshot-compression to configure.py for
users who prefer a size reduction over speedup in startup.
Ideally we should implement our own compression for the source
code + the code cache + the snapshot instead of relying on V8's
builtin compression for just the snapshot.

PR-URL: https://github.com/nodejs/node/pull/45716
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
This commit is contained in:
Joyee Cheung 2022-12-02 17:24:30 +01:00
parent 7f9e4faf0c
commit a996638e53
No known key found for this signature in database
GPG Key ID: 92B78A53C8303B8D
2 changed files with 9 additions and 1 deletions
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8
configure.py
View File

@ -805,6 +805,12 @@ parser.add_argument('--v8-enable-short-builtin-calls',
help='Enable V8 short builtin calls support. This feature is enabled '+
'on x86_64 platform by default.')
parser.add_argument('--v8-enable-snapshot-compression',
action='store_true',
dest='v8_enable_snapshot_compression',
default=None,
help='Enable the built-in snapshot compression in V8.')
parser.add_argument('--node-builtin-modules-path',
action='store',
dest='node_builtin_modules_path',
@ -1482,6 +1488,8 @@ def configure_v8(o):
o['variables']['v8_enable_hugepage'] = 1 if options.v8_enable_hugepage else 0
if options.v8_enable_short_builtin_calls or o['variables']['target_arch'] == 'x64':
o['variables']['v8_enable_short_builtin_calls'] = 1
if options.v8_enable_snapshot_compression:
o['variables']['v8_enable_snapshot_compression'] = 1
if options.v8_enable_object_print and options.v8_disable_object_print:
raise Exception(
'Only one of the --v8-enable-object-print or --v8-disable-object-print options '

2
tools/v8_gypfiles/features.gypi
View File

@ -216,7 +216,7 @@
'v8_enable_regexp_interpreter_threaded_dispatch%': 1,
# Disable all snapshot compression.
'v8_enable_snapshot_compression%': 1,
'v8_enable_snapshot_compression%': 0,
# Enable control-flow integrity features, such as pointer authentication
# for ARM64.