[Twisted-web] 100% CPU; what are my options?

Arun Gmail chhetriarun84 at gmail.com
Sun Jan 3 02:29:19 EST 2010

Hey I believe twisted is developed in a way that it can only use one  
processor at a time. As process scheduling is part of operating system  
it can only schedule one twisted reactor based application on one  
processor. For taking advantage of multiple processor you can use  
fork, but then it is not twisted way of doing stuff,, i am a new bie  
in twisted world, so comments are appreciated. Moreover I think  
twisted is similar to C select for tcp server


Sent from my iPhone

On Jan 3, 2010, at 12:20 AM, Colin <karnaugh at karnaugh.za.net> wrote:

> On Sun, Jan 3, 2010 at 5:26 AM, Leif K-Brooks <eurleif at gmail.com>  
> wrote:
> Hey,
> I operate Omegle (http://omegle.com/), which is a COMET-driven
> Twisted.Web app. (It doesn't use Nevow or anything; just Twisted.Web.)
> It gets fairly heavy traffic; right now, it peaks daily at around 6500
> concurrent users. Technical details:
> You should write a success story! I've used Omegle when the boredom  
> hits hard.
> - Hosted on a Linode 2880 virtual private server
> (https://www.linode.com/); Ubuntu, 2880 MB of RAM, 4 cores available
> - EPollReactor
> Omegle currently runs at close to 100% CPU for most of the day, and
> I'm a bit concerned about that.
> Try use the standard reactor instead of epoll. I found a similar  
> problem when I switched my product to the epoll reactor, the cpu  
> usage problem went away when I reverted back to the normal reactor.
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