# Localmemcache-0.2.1: The beauty of memcached. For local data. Blazingly fast **URL:** \ **Category:** Ruby\ **Created:** [April 5, 2009, 8:55pm UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777 "2009-04-05T20:55:45Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 5, 2009, 8:55pm UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/1 "2009-04-05T20:55:45Z")
Hi, this release addresses some bugs that people were experiencing and brings speed improvements. === Localmemcache that aims to provide an interface similar to memcached but for accessing local data instead of remote data. It’s based on mmap()'ed shared memory for maximum speed. - [http://localmemcache.rubyforge.org/](http://localmemcache.rubyforge.org/) === Changes for 0.2.1: - Fixed a bug that prevented setting values in the hashtable - Accessing a closed memory cache does no longer result in a crash - Speed improvements: On my machine localmemcache is now only about 20% slower than Ruby’s hash (0.2.0 was about 40% slower) - OS X is now officially not supported as it lacks sem\_timedwait and sem\_getvalue (You still can force a build but it won’t be able to recover from crashes.) - The environment variable LMC\_NAMESPACES\_ROOT\_PATH can now be used to override the default, which is /var/tmp/localmemcache # EXAMPLE require ‘localmemcache’ $lm = LocalMemCache.new :namespace =\> “viewcounters” $lm[:foo] = 1 $lm[:foo] $lm.delete(:foo) # INSTALL # gem install localmemcache (In case rubyforge has not yet updated the mirrors, fetch the 0.2.1 gem from here: [http://github.com/sck/localmemcache/downloads](http://github.com/sck/localmemcache/downloads) and then do # gem install localmemcache-0.2.1.gem ) # CONTACT Please contact me with bugs, suggestions and patches at: schween + snafu # de # LINKS Localmemcache: [http://localmemcache.rubyforge.org/](http://localmemcache.rubyforge.org/) Rubyforge project: [http://localmemcache.rubyforge.org/](http://localmemcache.rubyforge.org/) Source code is hosted on github: [GitHub - sck/localmemcache: mmap -\> lmc\_valloc -\> hashtable. BAM database](http://github.com/sck/localmemcache/) Best, Sven C. Koehler 4e25d2a677e6723f706d47da4dfd68cd localmemcache-0.2.1.gem 1658b6d660d64dbf57642789f49875e7 localmemcache-0.2.1.tar.gz ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 5, 2009, 9:33pm UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/2 "2009-04-05T21:33:50Z")
El Domingo 05 Abril 2009, Sven C. Koehler escribió:\> Hi, > this release addresses some bugs that people were experiencing and brings > speed improvements. Hi, I’m trying to install it in my 64 bits Ubuntu host with Ruby1.9.1 installed from sources in /usr/local. This is the error output I get after doing “gem install localmemcache”: /usr/local/bin/ruby1.9 extconf.rb install localmemcache checking for main() in -lrt… \*\*\* extconf.rb failed \*\*\* Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: –with-opt-dir –without-opt-dir –with-opt-include –without-opt-include=${opt-dir}/include –with-opt-lib –without-opt-lib=${opt-dir}/lib –with-make-prog –without-make-prog –srcdir=. –curdir –ruby=/usr/local/bin/ruby1.9 –with-rtlib –without-rtlib /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:362:in `try_do': The complier failed to generate an executable file. (RuntimeError) You have to install development tools first. from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:415:in`try\_link0’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:419:in `try_link' from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:527:in`try\_func’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:723:in `block in have_library' from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:668:in`block in checking\_for’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:274:in `block (2 levels) in postpone' from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:248:in`open’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:274:in `block in postpone' from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:248:in`open’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:270:in `postpone' from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:667:in`checking\_for’ from /usr/local/lib/ruby1.9/1.9.1/mkmf.rb:718:in `have_library' from extconf.rb:13:in`’ mkmf.log is empty. What could I check? Thanks. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 5, 2009, 9:50pm UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/3 "2009-04-05T21:50:14Z")
El Domingo 05 Abril 2009, Sven C. Koehler escribió:\> Hi, > this release addresses some bugs that people were experiencing and brings > speed improvements. Now I’ve installed it in Ruby1.8 with no problem but I think there is something wrong in the Gem. Basically if I do: * * * ## ~# irb1.8 irb\> require “localmemcache” LoadError: no such file to load – localmemcache from (irb):5:in `require’ from (irb):5 It makes sense since there is no “lib/localmemcache.rb” in the localmemcache gem directory. The only way to load it is by doing: * * * ## ~# cd /usr/lib/ruby/gems/1.8/gems/localmemcache-0.2.1/src/ruby-binding/ ~# irb1.8 irb\> require “localmemcache” true I understand that, for a normal Gem to work properly, it must create a “gen\_name.rb” in “GEMS\_DIR/gen\_name/lib/” (this is how all the rest of Gems are installed), but localmemcache doesn’t create a “lib” directory. Regards. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 2:28am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/4 "2009-04-06T02:28:05Z")
On Sun, Apr 05, 2009 at 09:48:26PM +0200, Iñaki Baz C. wrote: > ``` > from (irb):5 > > ``` I just checked it with my ubuntu machine and it’s fine for me. Most likely you didn’t load rubygems properly: | sck@u:~/$ sudo gem install localmemcache | Building native extensions. This could take a while… | Successfully installed localmemcache-0.2.1 | 1 gem installed | sck@u:~$ irb -rubygems | irb(main):001:0\> require ‘localmemcache’ | =\> true | irb(main):003:0\> $: | =\> ["/var/lib/gems/1.8/gems/localmemcache-0.2.1/bin", “/var/lib/gems/1.8/gems/localmemcache-0.2.1/src/ruby-binding”, “/usr/local/lib/site\_ruby/1.8”, “/usr/local/lib/site\_ruby/1.8/i486-linux”, “/usr/local/lib/site\_ruby/1.8/i386-linux”, “/usr/local/lib/site\_ruby”, “/usr/lib/ruby/vendor\_ruby/1.8”, “/usr/lib/ruby/vendor\_ruby/1.8/i486-linux”, “/usr/lib/ruby/vendor\_ruby”, “/usr/lib/ruby/1.8”, “/usr/lib/ruby/1.8/i486-linux”, “/usr/lib/ruby/1.8/i386-linux”, “.”] ## -S. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 2:34am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/5 "2009-04-06T02:34:30Z")
El Lunes 06 Abril 2009, David M. escribió:\> On Sunday 05 April 2009 14:48:28 Iñaki Baz C. wrote: > > ~# irb1.8 > > irb\> require “localmemcache” > > 1.9 has gems loaded by default. 1.8 doesn’t. Try: > > require ‘rubygems’ > require ‘localmemcache’ Sure you are right. Thanks for pointing it out. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 2:36am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/6 "2009-04-06T02:36:16Z")
El Lunes 06 Abril 2009, Sven C. Koehler escribió:\> I just checked it with my ubuntu machine and it’s fine for me. Most > likely you didn’t load rubygems properly: Yes, sorry, I forgot to load rubygems in 1.8. But there is still the issue with Ruby 1.9.1. It’s a different issue. Thanks. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 2:27am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/7 "2009-04-06T02:27:29Z")
On Sunday 05 April 2009 14:48:28 Iñaki Baz C. wrote: > ~# irb1.8 > irb\> require “localmemcache” 1.9 has gems loaded by default. 1.8 doesn’t. Try: require ‘rubygems’ require ‘localmemcache’ ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 3:48am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/8 "2009-04-06T03:48:24Z")
On Mon, Apr 06, 2009 at 09:30:12AM +0900, Iñaki Baz C. wrote: > But there is still the issue with Ruby 1.9.1. It’s a different issue. Ok, I just released localmemcache-0.2.2 which should fix the problems with Ruby 1.9. | sck@u:~$ sudo gem install localmemcache | Building native extensions. This could take a while… | Successfully installed localmemcache-0.2.2 | 1 gem installed | sck@u:~$ irb | irb(main):001:0\> require ‘localmemcache’ | =\> true | irb(main):002:0\> $: | =\> ["/var/lib/gems/1.9.0/gems/localmemcache-0.2.2/src/ruby-binding", “/var/lib/gems/1.9.0/gems/localmemcache-0.2.2/bin”, “/usr/local/lib/site\_ruby/1.9.0”, “/usr/local/lib/site\_ruby/1.9.0/i486-linux”, “/usr/local/lib/site\_ruby/1.9/i386-linux”, “/usr/local/lib/site\_ruby”, “/usr/lib/ruby/vendor\_ruby/1.9.0”, “/usr/lib/ruby/vendor\_ruby/1.9.0/i486-linux”, “/usr/lib/ruby/vendor\_ruby”, “/usr/lib/ruby/1.9.0”, “/usr/lib/ruby/1.9.0/i486-linux”, “/usr/lib/ruby/1.9/i386-linux”, “.”] -S. ---
**Author:** ![Sven\_CSKoehler](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3be4f8/32.png) [@Sven\_CSKoehler](https://www.ruby-forum.com/u/Sven_CSKoehler)\ **Post date:** [April 6, 2009, 10:38am UTC](https://www.ruby-forum.com/t/localmemcache-0-2-1-the-beauty-of-memcached-for-local-data-blazingly-fast/164777/9 "2009-04-06T10:38:29Z")
2009/4/6 Sven C. Koehler [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > On Mon, Apr 06, 2009 at 09:30:12AM +0900, Iñaki Baz C. wrote: > > > But there is still the issue with Ruby 1.9.1. It’s a different issue. > > Ok, I just released localmemcache-0.2.2 which should fix the problems > with Ruby 1.9. Thanks, it works! Just a question: Every data I save in localmemcache is converted to String: irb\> lm[:aaa]=true true irb\> lm[:bbb]=123 123 irb\> lm[:aaa] “true” irb\> lm[:bbb] “123” About the performance, even if localmemcache is just 20% slower than Ruby Hash, I wonder which is the real performance taking into account that all the returned values are String, so instead of: if @do\_action I must do: if $lm[:do\_action] == “true” However, really thanks for this great utility. It allows for example running 4 different processes of a Ruby programm in a quad-core CPU sharing local memory 🙂