[ruby-core:77124] [Ruby trunk Feature#6183] Enumerator::Lazy performance issue
From:
frankbernier@...
Date:
2016-09-01 18:10:52 UTC
List:
ruby-core #77124
Issue #6183 has been updated by Fran巽ois Bernier.
As of today, Enumerable::Lazy is pretty much still unused because of the performance hit. Is there anything I could do to help getting this in? Is there a paper on that subject I could read about to make improvements?
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Feature #6183: Enumerator::Lazy performance issue
https://bugs.ruby-lang.org/issues/6183#change-60344
* Author: Innokenty Mikhailov
* Status: Assigned
* Priority: Normal
* Assignee: Nobuyoshi Nakada
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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.
---Files--------------------------------
lazy_test.rb (428 Bytes)
bench.rb (389 Bytes)
new_bench.rb (957 Bytes)
16.05.2013.diff (23.8 KB)
26_07_2013.diff (24.6 KB)
26_06_2013_2.diff (24.4 KB)
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