On 10/24/2011 11:48, unruh wrote:
On 2011-10-24, A C<agcarver+...@acarver.net> wrote:
On 10/24/2011 06:24, unruh wrote:
On 2011-10-23, Uwe Klein<u...@klein-habertwedt.de> wrote:
A C wrote:
More interesting is that the cpu was pegged until I was able to kill and
restart ntpd. Most of the cpu was devoted to ntpd during this locked up
period. Simple things like typing at the console were difficult. It
would take a few seconds for a keypress to register on the screen. Once
ntpd was restarted the system responded normally and the cpu usage
dropped to normal levels.
This is still version 4.2.6p3. I should probably go ahead and compile
the most recently released version but I'm at a loss to understand why
it happened.
CPU (over)loaded
or the system is swapping like mad ?
That would destroy everything ( ie slow everything to a crawl). Also
ntpd is a small program and especially at heightened niceness (which he
said he used) should not get swapped out or affected.
( I'd think it is swapping? )
Right, the swapping would only occur if I was trying to actively do
something while diagnosing the problem. Otherwise the system load is so
low there's no real need to swap. There is no desktop environment
? swapping occurs if system memory fills up completely and there is no
more memory. It does not just refer to any disk access. Run top and see
if there is a substantial swap useage. If there issomething is very
wrong.
I was making the statement that swapping occured only when I was
actively attempting to debug the situation. Leaving the machine alone
did not result in sustained swapping.
running on the system, only the standard daemons plus some extras (sshd,
ntpd, gpsd, crond, syslogd, inetd, postfix for system messages only) and
then one xterm (with ssh session inside) and one xclock. The cron jobs
are mostly system housekeeping (log rotation, etc.) that occur at 0:00
but the crashes would occur at other times so none of the cron jobs were
running at the time of any crash.
NOne of those would cause swapping unless you only have 1MB of memory.
I understand that, I was only documenting them for completeness.
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