Bug #13228
Updated by nobu (Nobuyoshi Nakada) about 7 years ago
`s[i]=c`(assigning s[i]=c(assigning a character) for `String` String is slower than for `Array` Array on Linux. If I split the `String` String to `Array`, Array, and assign characters, and join the `Array` Array to `String`, String, then it is much faster than assigning characters directly to the string. Somehow, I don't see the performance difference on Mac OS X. ``` ~$ time ruby -e 'N=100000; s="a"*N; N.times{s[Random.rand(N)]="Z"}; puts s' >/dev/null real 0m0.879s user 0m0.836s sys 0m0.012s ~$ time ruby -e 'N=100000;s="a"*N;s=s.split(""); N.times{s[Random.rand(N)]="Z"}; puts s.join("")' >/dev/null real 0m0.153s user 0m0.108s sys 0m0.016s ~$ uname -a Linux aaaaaaaa 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ~$ ruby --version ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux] ~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial