红宝石 – 为什么我的宝石需要这么长时间才能加载？

t_time_tracker[master*]% time ruby -Ilib ./bin/t_time_tracker 
You're not working on anything
0.07s user 0.03s system 67% cpu 0.141 total

(这是我的应用程序的“你好世界” – 调用它没有参数只打印出“你不工作任何东西”)

大约十分之一秒,使用我的CPU的67％ – 酷,我可以生活在那里.感觉相当瞬间我们来构建它：

$gem build t_time_tracker.gemspec
$gem install ./t_time_tracker-0.0.0.gem

并且与安装的二进制文件完全相同：

$time t_time_tracker
You're not working on anything
t_time_tracker  0.42s user 0.06s system 93% cpu 0.513 total

半秒钟？这是从哪里来的？我们添加一些调试输出,并从开发二进制文件中包含系统gem,以查看瓶颈在哪里：

t_time_tracker[master*]% time ruby ./bin/t_time_tracker  
(starting binary)
(require 'time' and 'optparse')
0.041432
(before `require 't_time_tracker')
0.497135
(after `require 't_time_tracker')
(Gem.loaded_specs.keys = t_time_tracker)
(initializing TTimeTracker class)
You're not working on anything
ruby ./bin/t_time_tracker  0.44s user 0.07s system 91% cpu 0.551 total

好的,所以`require’t_time_tracker’线似乎是罪魁祸首.让我们再来一次irb来进一步缩小：

$irb
>> t=Time.now; require 't_time_tracker'; puts Time.now-t
0.046792
=> nil

…什么？但那只是半秒钟！我们尝试用我们的调试输出构建gem：

$gem build t_time_tracker.gemspec
$gem install ./t_time_tracker-0.0.0.gem
$time t_time_tracker
(starting binary) <---noticeable half second delay before this line shows up
(require 'time' and 'optparse')
0.050458
(before `require 't_time_tracker')
0.073789
(after `require 't_time_tracker')
(Gem.loaded_specs.keys = t_time_tracker)
(initializing TTimeTracker class)
You're not working on anything
t_time_tracker  0.42s user 0.06s system 88% cpu 0.546 total

那么是的,这个0.5秒的延迟来自哪里？我通常不会在意,但这是我每天要约五十次更新我正在做的事情. 50 * 0.5秒* 365天* 70岁= 15天失去生命.

系统信息：

Mac OS X 10.7.3. 2 GHz Intel Core 2 Duo. 4 GB公斤红宝石1.9.2p290.

% gem -v
1.8.10<---noticeable half second delay before this line shows up
% gem list | wc -l
209