From: "zzak (Zachary Scott)" <zachary@...>
Date: 2013-05-31T16:23:06+09:00
Subject: [ruby-core:55219] [ruby-trunk - Feature #6183] Enumerator::Lazy performance issue


Issue #6183 has been updated by zzak (Zachary Scott).


@gregolsen Looks like some of this was applied, sorry I haven't had a chance to check it yet.

Could you check?

It may need a rebase, the patch didn't apply cleanly and some of the functions already exist (like append_method())
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Feature #6183: Enumerator::Lazy performance issue
https://bugs.ruby-lang.org/issues/6183#change-39580

Author: gregolsen (Innokenty Mikhailov)
Status: Assigned
Priority: Low
Assignee: zzak (Zachary Scott)
Category: 
Target version: 


I benchmarked Enumerator::Lazy and that's what I got:
                 user     system      total        real
Lazy:        0.690000   0.010000   0.700000 (  0.733160)
Normal:      0.160000   0.010000   0.170000 (  0.186695)

It seems like even with 4 chain links and 3000 elements in initial array, Lazy enumerator is almost 4(!) times slower than the normal case.

Instead of performance benefit we've got 4 times performance drawback.

See test file attached.


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