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Issue #9590 has been updated by Nobuyoshi Nakada.
It is equivalent to calling `st_update()` on all elements?
`update_direct()` should be static, IMO.
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Feature #9590: introduce st_foreach_update and st_foreach_update_check for performance.
https://bugs.ruby-lang.org/issues/9590#change-45628
* Author: Masaya Tarui
* Status: Open
* Priority: Normal
* Assignee: Masaya Tarui
* Category: core
* Target version: current: 2.2.0
----------------------------------------
Hello,
I think I'll introduce st_foreach_update and st_foreach_update_check for performance.
For example, it is effective at Hash's rehash,dup and clone. (included in patch)
Are there any problem?
Patch is at https://gist.github.com/tarui/9345180 and attached here.
Some benchmarks are shown below.
<pre>
$cat test.rb
require 'benchmark'
N=10**6
a={}
Benchmark.bm(8) do |x|
x.report("create") { N.times{|i| a[i] = i} }
x.report("rehash") { a.rehash }
x.report("dup") { a.dup }
x.report("clone") { a.clone }
end
$ original_ruby test.rb
user system total real
create 0.730000 0.050000 0.780000 ( 0.788674)
rehash 1.030000 0.080000 1.110000 ( 1.113006)
dup 1.120000 0.050000 1.170000 ( 1.175618)
clone 1.300000 0.010000 1.310000 ( 1.312528)
$ proposed_ruby test.rb
user system total real
create 0.710000 0.050000 0.760000 ( 0.758993)
rehash 0.020000 0.000000 0.020000 ( 0.018409)
dup 0.130000 0.050000 0.180000 ( 0.182608)
clone 0.500000 0.000000 0.500000 ( 0.509430)
$ make gcbench-rdoc | tail -n8|head -n2
original_ruby:
user system total real
159.630000 2.870000 162.500000 (163.414495)
proposed_ruby:
user system total real
152.920000 2.730000 155.650000 (156.040741)
</pre>
---Files--------------------------------
0001-introduce-st_foreach_update-st_foreach_update_check.patch (7.58 KB)
--
http://bugs.ruby-lang.org/