# Migration from 2.2.2 to 2.3.4 causes CPU overhead on servers

**URL:** <https://www.ruby-forum.com/t/migration-from-2-2-2-to-2-3-4-causes-cpu-overhead-on-servers/178306>\
**Category:** Rails\
**Created:** [November 2, 2009, 3:40pm UTC](https://www.ruby-forum.com/t/migration-from-2-2-2-to-2-3-4-causes-cpu-overhead-on-servers/178306 "2009-11-02T15:40:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![oscar-alexander](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/e36b37/32.png) [@oscar-alexander](https://www.ruby-forum.com/u/oscar-alexander)\
**Post date:** [November 2, 2009, 3:40pm UTC](https://www.ruby-forum.com/t/migration-from-2-2-2-to-2-3-4-causes-cpu-overhead-on-servers/178306/1 "2009-11-02T15:40:47Z")

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Hi.

I migrated my application from rails 2.2.2 to 2.3.4 and from passenger  
2.0.6 to 2.2.5.

Good news that my app now is eating less memory, and bad news that cpu  
load is very high and rails processes are all have status RUNNING.

I didnt change any config options in my nginx and apache,  
i installed passenger simply by command  
/usr/local/ruby-enterprise-1.8.7-2009.10/bin/ruby /usr/local/ruby-  
enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/passenger-2.2.5/bin/  
passenger-install-apache2-module

Did anyone have such problems with migration to new rails (effective  
usage of memory but overhead of cpu)? Maybe it is problems with  
garbage collector?

I am in panic, please help.

Thank you.