Ruby slow startup performance on VMware

Question

my old netbook (AMD C-60) when starting Sinatra apps would starts in 5-7 seconds (Ruby), 23-24 seconds (JRuby)

OS (netbook): 32-bit Arch Linux 3.4.62-1 i686 PAE (2GB RAM)

my developmen PC (AMD A8-6600K) starts at 1-2 seconds (Ruby), 12-16 seconds (JRuby)

OS (pc): 32-bit Arch Linux 3.11.1-1 i686 PAE (8GB RAM)

When i add vmware on my development PC, starts at 0.9-2 seconds (Ruby), 7 seconds (JRuby)

Guest OS (vm-pc): 32-bit Arch Linux 3.11.1-2 i686 (1.5GB RAM)

when using 32-bit guest under 64-bit VMware under (i3-3220, that should be many times faster than my old netbook), it starts in 45-46 seconds (Ruby), and 30-37 seconds (JRuby)..

Guest OS (vm-i3): 32-bit Arch Linux 3.11.1-2 i686 (1.5GB RAM)

Host OS: 64-bit Ubuntu Linux 3.8.0.19 x86_64 13.04 (2GB RAM, only running Unity, VMware and gnome-terminal)

When running a single script (generating 12MB of data to database), the performance was normal:

real/user/sys
netbook: ruby: 4:25/2:13/0:02 jruby: 13:21/11:46/0:09
pc:      ruby: 1:39/0:31/0:05 jruby:  3:52/ 3:38/0:03
vm-pc:   ruby: 0:40/0:31/0:06 jruby:  3:25/ 3:12/0:02
vm-i3:   ruby: 1:18/0:21/0:05 jruby:  3:16/ 2:19/0:35

The configuration:

Ruby: using Thin web server, ruby -v
ruby 2.0.0p247 (2013-06-27 revision 41674) [i686-linux]

JRuby: using Trinidad web server, jruby -v
jruby 1.7.4 (1.9.3p392) 2013-05-16 2390d3b on OpenJDK Client VM 1.7.0_40-b31 +indy [linux-i386]

what are the possibilities the cause of this startup slowness on vm-i3?

Answer 1

问题出在/etc/hosts文件上，忘记添加包含localhost / hostname的行

Answer 2

Another thing which may slow ruby down on startup is the rubygems module. If you do not need to load gems, you can speed up startup by running ruby with the --disable-gems option.

If you later decide you want to load gems, a simple require 'rubygems' above the require 'some_gem' line suffices.