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YJIT: reduce default exec mem size to 48MiB (#9685)

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YJIT: reduce default exec mem size to 48MiB based

Based on user feedback from @jhawthorn and others.
Better for small and memory-constrained deployments.

NOTE: This commit should be included in the next Ruby 3.3.x point
release. @xrxr should we tag someone specific?
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Maxime Chevalier-Boisvert 2024-01-24 13:14:36 -05:00 committed by GitHub
parent 6b9317c9d5
commit 1702528258
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2 changed files with 3 additions and 3 deletions
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2
doc/yjit/yjit.md
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@ -165,7 +165,7 @@ The machine code generated for a given method can be printed by adding `puts Rub
YJIT supports all command-line options supported by upstream CRuby, but also adds a few YJIT-specific options:
- `--yjit`: enable YJIT (disabled by default)
- `--yjit-exec-mem-size=N`: size of the executable memory block to allocate, in MiB (default 64 MiB)
- `--yjit-exec-mem-size=N`: size of the executable memory block to allocate, in MiB (default 48 MiB)
- `--yjit-call-threshold=N`: number of calls after which YJIT begins to compile a function.
It defaults to 30, and it's then increased to 120 when the number of ISEQs in the process reaches 40,000.
- `--yjit-cold-threshold=N`: number of global calls after which an ISEQ is considered cold and not

4
yjit/src/options.rs
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@ -81,7 +81,7 @@ pub struct Options {
// Initialize the options to default values
pub static mut OPTIONS: Options = Options {
exec_mem_size: 64 * 1024 * 1024,
exec_mem_size: 48 * 1024 * 1024,
no_type_prop: false,
max_versions: 4,
num_temp_regs: 5,
@ -101,7 +101,7 @@ pub static mut OPTIONS: Options = Options {
/// YJIT option descriptions for `ruby --help`.
static YJIT_OPTIONS: [(&str, &str); 9] = [
("--yjit-exec-mem-size=num", "Size of executable memory block in MiB (default: 64)"),
("--yjit-exec-mem-size=num", "Size of executable memory block in MiB (default: 48)"),
("--yjit-call-threshold=num", "Number of calls to trigger JIT"),
("--yjit-cold-threshold=num", "Global calls after which ISEQs not compiled (default: 200K)"),
("--yjit-stats", "Enable collecting YJIT statistics"),