# Entire Rails App Loaded Into Memory?

**URL:** <https://www.ruby-forum.com/t/entire-rails-app-loaded-into-memory/126310>\
**Category:** Rails\
**Created:** [January 17, 2008, 9:54am UTC](https://www.ruby-forum.com/t/entire-rails-app-loaded-into-memory/126310 "2008-01-17T09:54:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![melvinram](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a698b9/32.png) [@melvinram](https://www.ruby-forum.com/u/melvinram)\
**Post date:** [January 17, 2008, 9:54am UTC](https://www.ruby-forum.com/t/entire-rails-app-loaded-into-memory/126310/1 "2008-01-17T09:54:34Z")

</div>

Hey everyone, I recently launched a product catalog website built on  
Rails and today I made a change to the app, uploaded the changes and  
nothing happened.

I made sure that my files on the server were the lastest by opening  
them using ssh.

So I thought it was a caching issue. I hadn’t created any caches but I  
figured that Rails might have some kind of caching engine on a  
production environment. I looked around and couldn’t find any cache  
files.

So I figured I’d test my cache issue theory by making a change  
manually to the db and see if it is refreshed or ignored.  
Surprisingly, the database change was reflected in my app but my app  
didn’t change. Basically my simple change was to display the price of  
the product when displaying a list of products. The name of the  
product changed (manual change in the db) but the price didn’t show  
up.

So I figured I’d try to restart my mongrel cluster… and that worked.  
So I was trying to figure out why that would be… and then I remember  
thinking… why is this mongrel server taking up 92 mb of my RAM on  
the server… and thats when it occured to me… maybe the entire web  
app is loaded into the mongrel server.

Now I could be totally off base and there could be another reasonable  
explanation… so I figured I’d ask.

Does anyone know if this is actually what happens?

~ mel

---

<div class="post-metadata">

**Author:** ![melvinram](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a698b9/32.png) [@melvinram](https://www.ruby-forum.com/u/melvinram)\
**Post date:** [January 17, 2008, 10:29am UTC](https://www.ruby-forum.com/t/entire-rails-app-loaded-into-memory/126310/2 "2008-01-17T10:29:21Z")

</div>

If you start your mongrel server in production mode all the code is  
loaded  
into memory. After making code changes do restart the server.