From: SASADA Koichi <ko1@...>
Date: 2010-11-11T02:39:14+09:00
Subject: [ruby-core:33128] Re: timer thread sleep interval (powertop abuses)

Hi,

(2010/11/11 2:34), Chris Mason wrote:
>> Why do you want to reduce timer thread wake-up counts?  Power issues?
> 
> Correct, the wakeups prevent the CPU from going into lower
> power modes.  It directly translates to more power usage and less time
> on battery.  I found this while using sup, which is an email client that
> we want to leave running for long periods.

On the multi-threaded environment, at least one thread is working.  So
that timet-thread invocation will not increase power consumption.

Or you mention about multi-core CPU?
(If 4 cores, 1 is for ruby thread and 1 for timer thread, this cause
same power issue.  I find this issue now :)  Thank you)


> So, if I set the sleep to 500ms, then I'll only switch threads every
> 500ms?  That's probably not ideal ;)

yes.

-- 
// SASADA Koichi at atdot dot net