On Fri, Feb 13, 2009 at 02:52:39PM -0800, Michael Fortson wrote:
> Great suggestions, guys -- thank you.
> swapoff -a and flushing the caches didn't seem to help, so I set up a grep
> to trigger it and ran vmstat while it happened. Here's what it looked like:
quite strange indeed. Could you run the following script alone then
during your greps to check that the system date is not jumping back
and forth ?
#!/bin/bash
old=$(date +%s);
while : ; do
new=$(date +%s);
if [ $new -lt $old ]; then
echo "Time jumps backwards : $old => $new"
elif [ $new -gt $((old+1)) ]; then
echo "Time jumps forwards : $old => $new"
fi
old=$new
done
This can typically happen on some opteron-based or NUMA systems
and cause very strange effects such as servers suddenly going
down and timeouts being triggered too early.
Willy
