From: "gregolsen (Innokenty Mikhailov)" <anotheroneman@...>
Date: 2013-06-03T04:20:59+09:00
Subject: [ruby-core:55259] [ruby-trunk - Feature #6183] Enumerator::Lazy performance issue


Issue #6183 has been updated by gregolsen (Innokenty Mikhailov).


Indeed append_method was exctracted by nobu 2 weeks ago as a refactoring of enumerator_inspect. But that's it, nothing was merged yet. I'm not sure I'll be able to rebase patch in next few weeks - got only android tablet with me. I'll let you know when ready. Thanks a lot for your interest.
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Feature #6183: Enumerator::Lazy performance issue
https://bugs.ruby-lang.org/issues/6183#change-39654

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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