Rainbow cpu load when launching an activity?

[Gary C Martin]

Hi Michael,

On 15 Aug 2008, at 21:58, Michael Stone wrote:

> On Fri, Aug 15, 2008 at 07:31:28PM +0100, Gary C Martin wrote:
>> I was curious to see (when testing in joyride-2301) that rainbow   
>> (python /usr/sbin/rainbow-daemon) seems to be the process that's   
>> eating the most CPU cycles during an activity launch.
>
> Well, rainbow does a little bit of work in order to make a new user,
> then it hands over control to the activity. Since we know that  
> activity
> launching is already slow (hence the need for the module preloading
> hack), it's not very surprising to me to that you see it chewing CPU
> when launching activities.
>
> Feel free to profile, though; I'd certainly like to know it if I'm  
> doing
> something truly idiotic. (Or if people are using rainbow in  
> environments
> significantly different from my own.)

Thanks, OK. I'm not exactly fully clued up on profiling such internals  
but I'll look at instrumenting interesting points of your rainbow  
source code on a running XO, and seeing if I have something useful to  
report. Please don't let that put off anyone else more qualified from  
looking.

--Gary