Re: what on earth is firefox up to?

JD <jd1008@xxxxxxxxx> · Sun, 01 Jul 2012 01:27:51 -0600

On 07/01/2012 12:39 AM, jdow wrote:

On 2012/06/30 20:55, JD wrote:

On 06/30/2012 08:17 PM, Tom Horsley wrote:

Every time I start firefox after recent updates, top
shows it periodically taking up to 50% of the CPU
even if I'm just looking at a simple page of plain
html (no scripts, not even any images) on my local
web server.

This is ff 13.0.1 on x86_64 fedora 17.

Any clues? Anyone see anything similar?

50% !!!???
Huh.... consider yourself LUCKY!
On my old unicore amd64 (3.7GHz "equivalent :) :) /smirk/)
it escalates  sometimes to 95% of cpu.

top tends to be confusing that way.
Note this line from my machine at a time it said FF was at 87.8%:

Cpu(s): 13.6%us, 33.7%sy,  0.0%ni, 52.5%id,  0.0%wa,  0.0%hi, 0.2%si,  

0.0%st

That was really 87.4% of the 13.6% user time that was consumed.

{^_^}

in <kernel source>/include/linux/taskstats.h
The comment reads:
        /* cpu "virtual" running time
         * Uses time intervals seen by the kernel i.e. no adjustment
         * for kernel's involuntary waits due to virtualization.

         * Value is cumulative, in nanoseconds, without a corresponding 

count

         * and wraps around to zero silently on overflow
         */

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