# Mongrel CPU Usage

**URL:** <https://www.ruby-forum.com/t/mongrel-cpu-usage/84695>\
**Category:** Rails\
**Created:** [February 7, 2007, 2:47am UTC](https://www.ruby-forum.com/t/mongrel-cpu-usage/84695 "2007-02-07T02:47:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![glenn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/4bbf92/32.png) [@glenn](https://www.ruby-forum.com/u/glenn)\
**Post date:** [February 7, 2007, 2:47am UTC](https://www.ruby-forum.com/t/mongrel-cpu-usage/84695/1 "2007-02-07T02:47:38Z")

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Hi  
Just wondering whats reasonable to expect in terms of mongrels CPU  
usage. I’ve established an app with 1 mongrel instance on a debian  
etch box. This process idles (yes idles) on 10% - 20% - this means say  
I install 10 apps each with 2 mongrels, I’ve used twice my cpu  
capacity _without_ even accepting a hit!

is this reasonable/typical behvaviour from mongrel? What are the  
minimum specs of a cpu people are typically using for mongrel?

heres my /proc/cpuinfo:  
processor : 0  
vendor\_id : AuthenticAMD  
cpu family : 6  
model : 10  
model name : AMD Athlon™  
stepping : 0  
cpu MHz : 1250.065  
cache size : 512 KB  
fdiv\_bug : no  
hlt\_bug : no  
f00f\_bug : no  
coma\_bug : no  
fpu : yes  
fpu\_exception : yes  
cpuid level : 1  
wp : yes  
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge  
mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts  
bogomips : 2506.90

Thanks for any hints  
Glenn

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**Author:** ![glenn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/4bbf92/32.png) [@glenn](https://www.ruby-forum.com/u/glenn)\
**Post date:** [February 7, 2007, 4:02am UTC](https://www.ruby-forum.com/t/mongrel-cpu-usage/84695/2 "2007-02-07T04:02:42Z")

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Hi Glenn,

glenn wrote:

> Just wondering whats reasonable to expect  
> in terms of mongrels CPU usage. I’ve  
> established an app with 1 mongrel instance on  
> a debian etch box. This process idles (yes idles)  
> on 10% - 20%

IM(very limited)E, I’d say something is definitely fubar with your  
config.  
I’m on a VPS at a2hosting with 10-12 other apps on the box and, looking  
at  
top, your numbers are way out of whack.

There’s a new, better place to post your question. Robby R. from  
PlanetArgon started it for just this kind of thing and all the top-level  
Rails admin talent is there.  
[http://groups.google.com/group/rubyonrails-deployment?hl=en](http://groups.google.com/group/rubyonrails-deployment?hl=en)

They’re here too, of course. It’s just a signal/noise thing.

hth,  
Bill

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<div class="post-metadata">

**Author:** ![glenn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/4bbf92/32.png) [@glenn](https://www.ruby-forum.com/u/glenn)\
**Post date:** [February 7, 2007, 4:17am UTC](https://www.ruby-forum.com/t/mongrel-cpu-usage/84695/3 "2007-02-07T04:17:43Z")

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> 

great that -will follow that up  
thanks

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<div class="post-metadata">

**Author:** ![glenn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/4bbf92/32.png) [@glenn](https://www.ruby-forum.com/u/glenn)\
**Post date:** [February 7, 2007, 1:56pm UTC](https://www.ruby-forum.com/t/mongrel-cpu-usage/84695/4 "2007-02-07T13:56:34Z")

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On 2/7/07, glenn [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> is this reasonable/typical behvaviour from mongrel? What are the  
> minimum specs of a cpu people are typically using for mongrel?

No way. CPU usage should be negligible when not processing requests.  
Are you sure you’re not accidentally reading the value from the memory  
usage column?