From: KOSAKI Motohiro <kosaki.motohiro@...>
Date: 2011-07-02T23:48:39+09:00
Subject: [ruby-core:37743] Re: [Ruby 1.9 - Bug #4962] come back gem_prelude!

Hi

2011/7/2 Luis Lavena <luislavena@gmail.com>:
>
> Issue #4962 has been updated by Luis Lavena.
>
>
> Yusuke Endoh wrote:
>> There are some approaches to address the problem:
>>
>> � 1. to introduce a generational GC; this is impossible until 2.0 because
>> � � �it requires modifications to all extension libraries.
>>
>> � 2. to diet rubygems; do not create any string, array, hash, and any
>> � � �object as much as possible, and do not keep the references to them.
>>
>> � 3. to restore gem_prelude.rb to delay loading rubygems.
>>
>> I guess that 3 is a reasonable choice for 1.9.3. �But I'm fine with any
>> solution to fix rubygems if 1.9.3 becomes as fast as 1.9.2 on the
>> benchmarks.
>>
>
> AFAIK, The issue with gem_prelude in the past has been that it loaded by default the latest version of every gem in $LOAD_PATH, not allowing you at later time decide another version.
>
> 1.9.3 is in feature freeze, right? I was hoping Eric Hodel's proposal desscribed in [ruby-core:31885] could be implemented.

Right. but I think this large degression can be considered blocker.
I've compared 192, 192 w/o gem, trunk, trunk w/o gems by following way.

/usr/bin/ruby ../benchmark/driver.rb -v
--executables="192r31932-nogems::~/ruby/bin/ruby-192-r31932
--disable-gems; 192r321932::~/ruby/bin/ruby-192-r31932;
trunk-nogems::~/ruby/bin/ruby-trunk --disable-gems;
trunk::~/ruby/bin/ruby-trunk -I../lib -I. -I.ext/common
../tool/runruby.rb --extout=.ext --" --pattern='bm_'
--directory=../benchmark -r 5


some bench have big degression.

name 192r31932-nogems 192r321932 trunk-nogems trunk
-----------------------------------------------------------------------------------------
vm3_gc 1.041 1.072 1.104 2.055
app_factorial 0.988 0.992 0.993 1.170
io_file_read 2.402 2.420 2.392 2.702
so_ackermann 0.907 0.901 0.896 0.952
so_binary_trees 0.475 0.481 0.480 0.546
so_k_nucleotide 1.768 1.838 1.885 1.963
so_pidigits 0.672 0.675 0.676 0.821


And another some benches have minor degression.

name 192r31932-nogems 192r321932 trunk-nogems trunk
-----------------------------------------------------------------------------------------
app_fib 0.812 0.816 0.792 0.849
app_raise 0.830 0.835 0.808 0.847
app_strconcat 1.703 1.725 1.796 1.862
app_tak 1.131 1.142 1.131 1.157
app_tarai 0.916 0.919 0.921 0.930
app_uri 1.332 1.343 1.383 1.389
io_file_create 3.075 3.088 3.105 3.133
so_array 1.910 1.905 1.856 1.918
so_lists 1.286 1.298 1.290 1.373
so_matrix 1.107 1.101 1.060 1.105
so_reverse_complement 2.016 2.058 2.050 2.119


Briefly says, trunk-nogems is slightly faster than 192-nogems. but
trunk is slower than 192.