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Lazily create objspace->id_to_obj_tbl

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This inverse table is only useful if `ObjectSpace._id2ref` is used,
which is extremely rare. The only notable exception is the `drb` gem
and even then it has an option not to rely on `_id2ref`.

So if we assume this table will never be looked up, we can just
not maintain it, and if it turns out `_id2ref` is called, we
can lock the VM and re-build it.

```
compare-ruby: ruby 3.5.0dev (2025-04-10T09:44:40Z master 684cfa42d7) +YJIT +PRISM [arm64-darwin24]
built-ruby: ruby 3.5.0dev (2025-04-10T10:13:43Z lazy-id-to-obj d3aa9626cc) +YJIT +PRISM [arm64-darwin24]
warming up..

|           |compare-ruby|built-ruby|
|:----------|-----------:|---------:|
|baseline   |     26.364M|   25.974M|
|           |       1.01x|         -|
|object_id  |     10.293M|   14.202M|
|           |           -|     1.38x|
```
This commit is contained in:
Jean Boussier 2025-04-10 11:53:39 +02:00
parent b68172caad
commit 0606046c1a
Notes: git 2025-04-15 00:18:12 +00:00
5 changed files with 74 additions and 20 deletions
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4
benchmark/object_id.yml Normal file
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@ -0,0 +1,4 @@
benchmark:
baseline: "Object.new"
object_id: "Object.new.object_id"
# loop_count: 100000