[#63592] [ruby-trunk - Bug #10009] IO operation is 10x slower in multi-thread environment — normalperson@...
Issue #10009 has been updated by Eric Wong.
3 messages
2014/07/08
[#63682] [ruby-trunk - Feature #10030] [PATCH] reduce rb_iseq_struct to 296 bytes — ko1@...
Issue #10030 has been updated by Koichi Sasada.
3 messages
2014/07/13
[#63703] [ruby-trunk - Feature #10030] [PATCH] reduce rb_iseq_struct to 296 bytes — ko1@...
Issue #10030 has been updated by Koichi Sasada.
3 messages
2014/07/14
[#63743] [ruby-trunk - Bug #10037] Since r46798 on Solaris, "[BUG] rb_vm_get_cref: unreachable" during make — ngotogenome@...
Issue #10037 has been updated by Naohisa Goto.
3 messages
2014/07/15
[#64136] Ruby 2.1.2 (and 2.1.1 and probably others) assumes a libffi with 3 version numbers in extconf.rb — "Jeffrey 'jf' Lim" <jfs.world@...>
As per subject.
4 messages
2014/07/31
[#64138] Re: Ruby 2.1.2 (and 2.1.1 and probably others) assumes a libffi with 3 version numbers in extconf.rb
— "Jeffrey 'jf' Lim" <jfs.world@...>
2014/07/31
On Thu, Jul 31, 2014 at 6:03 PM, Jeffrey 'jf' Lim <[email protected]>
[ruby-core:63477] [ruby-trunk - Bug #10003] [Open] Hash#fetch performance issue
From:
richard.schneeman@...
Date:
2014-07-01 22:08:51 UTC
List:
ruby-core #63477
Issue #10003 has been reported by Richard Schneeman.
----------------------------------------
Bug #10003: Hash#fetch performance issue
https://bugs.ruby-lang.org/issues/10003
* Author: Richard Schneeman
* Status: Open
* Priority: Normal
* Assignee:=20
* Category: core
* Target version:=20
* ruby -v: 2.1.2
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
It looks like there is a performance issue with Hash#fetch compared to Hash=
#[]. I found this issue via this gist: https://gist.github.com/jonleighton/=
3552829. I could not find it reported anywhere on the tracker, forgive me i=
f this is a known issue:
```
require 'benchmark/ips'
=20
h =3D { foo: :bar }
=20
Benchmark.ips do |r|
r.report('#[]') { h[:foo] }
r.report('#fetch') { h.fetch(:foo) }
end
Calculating -------------------------------------
#[] 124893 i/100ms
#fetch 121729 i/100ms
-------------------------------------------------
#[] 6917857.4 (=C2=B120.4%) i/s - 32472180 in 5.00883=
2s
#fetch 4570251.5 (=C2=B118.8%) i/s - 22032949 in 5.01571=
2s
```
This is in Ruby 2.1.2
--=20
https://bugs.ruby-lang.org/