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author | Eric Wong <e@80x24.org> | 2017-02-28 23:58:15 +0000 |
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committer | Eric Wong <e@80x24.org> | 2017-03-08 09:18:26 +0000 |
commit | 979ebcf91705709be5041a3be4514e5f1f6ec02c (patch) | |
tree | 5e339d5cbf681872ed1ef83ddb9b9b2cc3598b21 /Sandbox | |
parent | ff13ad38ba9f83e0dd298be451aac7c75145d33b (diff) | |
download | unicorn-979ebcf91705709be5041a3be4514e5f1f6ec02c.tar.gz |
rb_global_variable registers the address of the variable which refers to the object, instead of the object itself. This adds extra overhead to each global variable for our case, where the variable is frozen and never changed. Given there are currently 59 elements in this array, this saves 58 singly-linked list entries and associated malloc calls and associated overhead in the current mainline Ruby 2.x implementation. On 64-bit GNU libc malloc, this is already 16 * 58 = 928 bytes; more than the extra object slot and array slack space used by the new mark array. Mainline Ruby 1.9+ currently has a rb_gc_register_mark_object public function which would suite our needs, too, but it is currently undocumented, and may not be available in the future.
Diffstat (limited to 'Sandbox')
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