From: frankbernier@... Date: 2016-09-01T18:10:52+00:00 Subject: [ruby-core:77124] [Ruby trunk Feature#6183] Enumerator::Lazy performance issue Issue #6183 has been updated by Fran��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? ---------------------------------------- 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 ---------------------------------------- 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) -- https://bugs.ruby-lang.org/ Unsubscribe: