Re: CPU Usage?
Re: CPU Usage?
- Subject: Re: CPU Usage?
- From: Kyle Wheeler <email@hidden>
- Date: Fri, 29 Mar 2002 13:54:44 -0500
On Friday, March 29, 2002, at 10:15 AM, email@hidden wrote:
Ran "top" to see what was going on and found that top itself uses about
10% of available CPU cycles even when nothing else is been done. Also
"Terminal" is using another ~4%. On top of that I see OmniWeb and
iTunes using cycles, although both are not doing anything other than
being open apps in the dock. OmniWeb's usage really jumps around,
sometimes going as high as 40%. Can someone explain what's going on
here? Thank for any enlightenment.
Any process that is doing *anything* will use CPU cycles.
top: depending on what mode you use, top may have to sort things, it
certainly needs to format it's output, and it continually polls the
kernel to find out the information that it's displaying - so top uses
CPU cycles because it is doing exactly that.
Terminal: The terminal is busy refreshing itself. Since top keeps
telling the terminal to clear certain sections and redraw them, the
Terminal keeps having to do stuff (not as much stuff, since it doesn't
have to organize or sort or format anything, so it uses less cpu).
iTunes: is the iTunes window open? Then it is doing something - it's
scrolling the name of the current song. As for how much rendering and
whatnot is involved, I don't know, but that's what it's doing. Close the
iTunes window (the application will still be running) and watch it's cpu
usage drop to zero.
OmniWeb: Depends on what it's doing. It may be displaying a web page
that has animation. It may be checking up on bookmarks that you told it
to check for changes every so often. It may be telling Aqua to throb the
default button on a form on a web page. If it's doing *anything* at all,
it will take up CPU time. Some web pages have an auto-refresh command in
their meta tags (like versiontracker) that tell the web browser to
refresh the page every so often. It could be doing all sorts of things,
even though it appears to be "doing nothing" like you say.
~Kyle Wheeler
--
Nonsense. Space is blue and birds fly through it.
-- Heisenberg
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