Monthly Archives: September 2010

how to compile ruby with increased garbage size

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You may have noticed when you’re running long-ish rails processes in windows that it sometimes pauses briefly, then continues on its merry way.

I have, at least.
The problem can be attributed to the garbage collector.
Ex: with one operation large_table.find(:all).each{||…}
I would receive something like 10 0.10 second pauses before it finished–increasing my overall time by at least 25%
Tweaking the malloc limit [the amount it will grow before doing a GC limit] changed that to something like 2 0.25 second pauses–which caused things to speedup considerably.
How:
install msysgit
c:> git://github.com/oneclick/rubyinstaller.git
cd rubyinstaller
set CCFLAGS=-DGC_MALLOC_LIMIT=60000000
rake # build ruby 1.8 in sandbox/ruby18_mingw
rake ruby19 # build ruby 1.9 in sandbox/ruby19_mingw
Installers hopefully coming soon.
Another option for speeding things up is building with GCC 4.4 instead of the 3.4.5 currently used.
Here’s a download that does that for the adventurous:
http://all.faithpromotingstories.org/ruby_distros/ruby19_mingw_44.tgz
Anyway, watch this area as I’ll post various ruby executables with different (faster) compiler options, and experimental like using tcmalloc, etc.
Thanks and good luck to all your windows+ruby users (like myself) out there!
Also much thanks to Luis and the one click group for making it possible to use these cool tools.

jruby bugs removed

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for posterity sake, here’s the stuff i removed from the wiki:

====Under OSX I get this error when trying to execute jruby:  ”Exception in thread ‘main’ java.lang.NoClassDefFoundError: org/jruby/Main” ====
The source of this problem is the inclusion of <tt>’.'</tt> (current directory) in your $PATH. You’re also trying to execute JRuby from <tt>$JRUBY_HOME/bin</tt>. There’s a bug in the JRuby bash script that prevents this from working.
To correct the issue, remove <tt>’.'</tt> from your $PATH and relaunch the shell. Alternately, if you really want to keep <tt>’.'</tt> in your $PATH (which you shouldn’t, but see google for reasons why), then just change your working directory to something other than <tt>$JRUBY_HOME/bin</tt> and execute the <tt>jruby</tt> command. It should launch just fine.
% cd /any/path/other/than/jruby_home
% jruby # should work
”’Note:”” This bug has been fixed in JRuby 1.2.

====Under OSX I get this error when trying to execute jruby:  ”Exception in thread ‘main’ java.lang.NoClassDefFoundError: org/jruby/Main” ====The source of this problem is the inclusion of <tt>’.'</tt> (current directory) in your $PATH. You’re also trying to execute JRuby from <tt>$JRUBY_HOME/bin</tt>. There’s a bug in the JRuby bash script that prevents this from working.
To correct the issue, remove <tt>’.'</tt> from your $PATH and relaunch the shell. Alternately, if you really want to keep <tt>’.'</tt> in your $PATH (which you shouldn’t, but see google for reasons why), then just change your working directory to something other than <tt>$JRUBY_HOME/bin</tt> and execute the <tt>jruby</tt> command. It should launch just fine.  % cd /any/path/other/than/jruby_home  % jruby # should work
”’Note:”” This bug has been fixed in JRuby 1.2.

jruby jframe image

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Here it is:

require’java’
module M
include_package “javax.swing”
include_package “javax.awt”
include_package “javax.net”
class ShowImage < JFrame
def initialize
@img= java.awt.Toolkit.getDefaultToolkit().getImage(“c:/dev/ruby/johnpack1.jpg”)
end
def paint(g)
g.drawImage(@img,Time.now.to_f % 100,20,self)
end
end
end
frame = M::ShowImage.new
frame.setSize(200,200)
frame.defaultCloseOperation = M::JFrame::EXIT_ON_CLOSE
frame.visible=true

rmagick collage

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Here’s how to combine two images into one (a “collage”)

require ‘rubygems’
require ‘RMagick’
include Magick
image_name = ‘johnpack1.jpg’
image_1 = Image.read(image_name).first
image_2 = Image.read(image_name).first
image_2.crop_resized!(10,10)
image_1.composite!(image_2, 1 * 100 + rand(15), 150 + rand(15), OverCompositeOp)
image_1.write(‘collage.jpg’)

require ‘rubygems’require ‘RMagick’include Magick
image_name = ‘johnpack1.jpg’
image_1 = Image.read(image_name).firstimage_2 = Image.read(image_name).first
image_2.crop_resized!(10,10)
image_1.composite!(image_2, 1 * 100 + rand(15), 150 + rand(15), OverCompositeOp)image_1.write(‘collage.jpg’)

ref:

http://weare.buildingsky.net/2006/10/18/render-greatlooking-collages-with-ruby-and-rmagick

vlc build woes

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CC     liblua_plugin_la-net.lo
libs/net.c: In function ‘vlclua_fd_write’:
libs/net.c:249:5: error: implicit declaration of function ‘write’
libs/net.c: In function ‘vlclua_fd_read’:
libs/net.c:259:5: error: implicit declaration of function ‘read’
make[6]: *** [liblua_plugin_la-net.lo] Error 1
make[6]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc/lua’
make[5]: *** [all] Error 2
make[5]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc/lua’
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc’
make[3]: *** [all] Error 2
make[3]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc’
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules’
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc’
make: *** [all] Error 2

CC     liblua_plugin_la-net.lolibs/net.c: In function ‘vlclua_fd_write’:libs/net.c:249:5: error: implicit declaration of function ‘write’libs/net.c: In function ‘vlclua_fd_read’:libs/net.c:259:5: error: implicit declaration of function ‘read’make[6]: *** [liblua_plugin_la-net.lo] Error 1make[6]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc/lua’make[5]: *** [all] Error 2make[5]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc/lua’make[4]: *** [all-recursive] Error 1make[4]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc’make[3]: *** [all] Error 2make[3]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules/misc’make[2]: *** [all-recursive] Error 1make[2]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc/modules’make[1]: *** [all-recursive] Error 1make[1]: Leaving directory `/c/dev/ruby/downloads/juhovh_vlc’make: *** [all] Error 2

meant “disable lua–something is not quite right in there [mingw videolan]“