Repository files navigation

Instantjemalloc injection into Ruby apps, for better performance and less memory.

Ruby relies on malloc(3) for its internal memory allocation. Using better malloc() implementation will boost your application performance, and supress the memory usage.

jemalloc is a malloc(3) implementation, originally developed by Jason Evans. jemalloc handles small object better than other allocators so usually gives better performance and memory usage to Ruby programs.

Installing jemalloc separately from Ruby is pain in some cases (e.g. Heroku, EngineYard, etc).je gem contains jemalloc itself within a gem, and enables instant jemalloc injection in a really easy way: installje gem, and launch your app withje command.

Installjemalloc gem in your application. Forbundler based application, please add the following line into your Gemfile, and and installjemalloc bybundle install.

gem 'jemalloc'

Execute your application withje command, which is contained inje gem. Example command for Rails + bundler application is like follows.

$ bundle exec je ./script/rails s

-v option will let you confirm jemalloc is actually injected.

$ bundle exec je -v ./script/rails s=> Injecting jemalloc...=> Booting WEBrick...

Currently, this gem works only on Linux and Mac OS X.

BSD-derived License.