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Re: netbsd-4 vs -current web server performance
On Wed, Sep 3, 2008 at 3:08 PM, Jeff Rizzo <riz%netbsd.org@localhost> wrote:
> Thor Lancelot Simon wrote:
>> On Tue, Sep 02, 2008 at 02:52:33PM -0700, Jeff Rizzo wrote:
>>> Jeff Rizzo wrote:
>>>> Looking at both machines, the one running 4 was at its normal load -
>>>> between 4 and 5 - but the machine running -current had a load of about
>>>> 12, and many of the httpd processes were showing as 'parked' in top, and
>>>> there were no idle cpus. Restarting apache on the affected machine seems
>>>> to have brought things back to normal - both machines have a load just
>>>> under 3, and all CPUs (8 per box) have ~80% idle.
>>> By way of following up to myself, I just had to pull the -current
>>> machine out of the rotation for unrelated reasons (forgot to install an
>>> important package on it), and the load dropped away *except* for three
>>> httpd processes:
>>> PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
>>> 4742 www 42 0 17M 314M parked/2 233:14 99.02% 99.02% httpd
>>> 3265 www 39 0 17M 266M parked/0 164:34 99.02% 99.02% httpd
>>> 8844 www 40 0 17M 298M parked/0 158:27 99.02% 99.02% httpd
>> Parked *and* 100% of a CPU?
>> That seems just wrong.
> I would tend to agree - but I don't know all that much about the new
> states. This issue is fairly reproducible (within a few hours) - and
> also seems to go away (for a few hours) after restarting apache. I have
> a couple weeks to get this fixed, since even at it's worst it's not too
> bad, and in any event I have multiple webservers.
Do the httpd's slowly increase until they get parked at 99% or do they
If it's a slow increase, could you start monitoring various stats like
the number of threads/PID, memory growth, etc?
If it's a sudden spike, is there a way you can run ktrace or something
until you can start to isolate the trigger?
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