duping an Identity Hash/Set is faster than creating a new one #230
Description
It's one less allocation, too :)
| YJIT off | YJIT on | |
|---|---|---|
Set.new.compare_by_identity | 2.571M | 4.260M |
S.dup | 3.014M | 4.999M |
| ∆ | 1.17x | 1.17x |
| YJIT off | YJIT on | |
|---|---|---|
Hash.new.compare_by_identity | 5.643M | 8.208M |
H.dup | 5.988M | 9.014M |
| ∆ | 1.06x | 1.09x |
S = Set.new.compare_by_identity.freeze H = Hash.new.compare_by_identity.freeze Benchmark.ips do |x| x.config(time: 10) x.report(".new.compare_by_identity") do |times| i = 0 while (i += 1) <= times S.dup end end x.report(".dup ") do |times| i = 0 while (i += 1) <= times Set.new.compare_by_identity end end x.compare! end Benchmark.ips do |x| x.config(time: 10) x.report(".new.compare_by_identity") do |times| i = 0 while (i += 1) <= times H.dup end end x.report(".dup ") do |times| i = 0 while (i += 1) <= times Hash.new.compare_by_identity end end x.compare! end