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Replace `__product_group` method with `__product_generate` and `__product_next`. This change eliminates the need for Ruby to perform internal state calculations, allowing it to simply receive the results.
Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly optimizes the Highlights
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Code Review
The code changes refactor the product method in mruby-array-ext to use a generator pattern for improved performance, especially when used with a block. The reviewer suggests further optimization by storing the arys array within the generator object to reduce overhead when calling __product_next.
| ary_product_next(mrb_state *mrb, mrb_value self) | ||
| { | ||
| mrb_value arys; | ||
| struct ary_product_generator *g; | ||
| mrb_get_args(mrb, "Ad", &arys, &g, &ary_product_generator_type); | ||
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| if (g->cursor >= g->total) { | ||
| return mrb_nil_value(); | ||
| } | ||
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| return ary_product_fetch(mrb, self, arys, g->cursor++); | ||
| } |
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For further optimization, consider storing the arys array within the generator object itself rather than passing it from Ruby on every call to __product_next. This would reduce the overhead of passing the array across the Ruby/C boundary in each iteration of the while loop.
This would involve:
- Adding a
mrb_value arys;field to thestruct ary_product_generator. - Storing
arys_aryin this new field withinary_product_generateand adding a write barrier. - Adding a
markfunction toary_product_generator_typeto ensurearysis not garbage collected. - Modifying
ary_product_nextto retrievearysfrom the generator struct instead of from its arguments. - Updating the call in
array.rbto__product_next(gen)and the method signature in the C method table.
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@gemini-code-assist
In the current version of mruby, there is no way to protect an object from the garbage collector once it has been placed in a user-defined structure.
However, placing it in a hidden instance variable is not memory-efficient.
Therefore, I believe the current patch strikes a good balance.
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Thank you for clarifying the mruby garbage collector's limitations regarding protecting objects placed directly in user-defined C structures. Given this constraint, and the potential memory inefficiency of using hidden instance variables, I agree that the current implementation strikes a good balance between performance and memory management. It's important to work within the existing GC capabilities.
2 participants
Replace
__product_groupmethod with__product_generateand__product_next.This change eliminates the need for Ruby to perform internal state calculations, allowing it to simply receive the results.