<div class="gmail_quote">On Thu, Oct 29, 2009 at 3:04 PM, jansenj <span dir="ltr"><<a href="mailto:jansenj%2Bmyth@gmail.com">jansenj+myth@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I just noticed that when I do a "top" that mythfrontend.real is consuming almost 15% CPU when it is running at 1Ghz. I'm using mythbuntu theme with Qt on mythbuntu's 0.22-fixes packages. Any ideas what could have changed? Or is it something I could have changed?<br>
</blockquote></div><br>I thought I'd reply to my original post.<br><br>The behavior here is without a doubt attributed to mythui pulse.<br><br>It looks like animate is called at 70Hz, and as it was said in this thread, this can be dropped much lower if you don't have animations, but it takes modifying source and rebuilding.<br>
<br>I'm astounded that the majority of the people reporting this behavior report similar cpu usage levels, no mater what the clock speed of the cpu. In fact I can have mine clocked at 1Ghz or 2Ghz, and both result in a 14% utilization, so there seems to be an odd timing or wait component that doesn't give up context, but I couldn't find one. But if we do the math, every time animate runs, it consumes the cpu for a full 2ms.<br>
<br>It looks like Animate calls a bunch of pulses from all sorts of object types: clocks, images, text...etc. It looks like to me, that all pulses eventually end up calling mythuitype::pulse which sets up the screen to redraw if it detected any motion or alpha blending changes. Then it loops through and does a pulse on all the given children for that single item. <br>
<br>Something that confused me: I tried commenting out all the pulse bodies that call mythuitype::pulse, and I still could get into a mode where 14% utilization was seen. But if I comment out the body of mythuitype::pulse the cpu usage drops way down, but myth doesn't work very well if you do that. After all, it looks like for every iteration of animate mythuitype::pulse gets called 39 times in my setup. That means, normally, it is doing an alpha pulse and motion pulse 2700 times per second each. But I wouldn't think that would add up to 140ms of time.<br>