Personal computing discussed
Moderators: renee, farmpuma, just brew it!
Flying Fox wrote:Question: if I just want the VM to fold and not for measuring stuff, do I really need to care about the drift? Just let it quietly chew up the WUs being thrown at the VM is good enough?
This is seriously screwing up any measurements.Flying Fox wrote:Yeah, it is screwing up measuring the ppd big time I can see. I am seeing it now in FahMon. Another weird thing is that the interval from one % to the next may not be constant. I am getting some % taking 12 minutes and then another take>1hr.
notfred wrote:I have a script running periodically to do the backups, I could throw in some time sync stuff of some sort in to that.
hwclock -s
JPinTO wrote:If you install Vmware tools onto Linux, there is a synchronize time with host option.
- JP
Ragnar Dan wrote:But the -passkey requirement irks me, and I'm going to have to do power calculations which will be difficult to find accurate figures for in order to compute them. At least I'll get an estimate of whether it's worth the effort and what the electrical costs or savings would be (because I might retire other power-hungry producers too, depending on output).
Sorry for the wordiness, but I'm a bit more relaxed than usual thanks to consuming a bit more alcohol than usual for a weeknight.
JPinTO wrote:If you install Vmware tools onto Linux, there is a synchronize time with host option.
- JP
#!/bin/bash
# timesync - Aggressive clock synchronizer for VirtualBox VMs
# Must be run as root!
# Specify the name or IP address of the NTP server to sync with on the command line.
# If you specify an option of -b, the script will run in the background instead of in the
# foreground.
checkinterval=10 # check interval (secs)
slewthresh=25000 # threshold before we slew (usecs)
stepthresh=250000 # threshold before we step (usecs)
slewdelay=300 # min time between successive slew requests (secs)
logfile=/var/log/timesync # log file for background operation
# If -b specified, go to background
if [[ $1 == '-b' ]]; then
shift
$0 $* > $logfile 2>&1 &
exit
fi
server=$1
if [[ "$server" == "" ]]; then
echo No NTP server specified! >&2
exit 1
fi
echo "`date`: timesync started (server=$server)"
lastslew=0
while true; do
offset=$((`ntpdate -q $server | head -n1 | sed -e 's/^.*offset //g;s/,.*$//g;s/-//g;s/\.//g;s/^0*//g'`))
if [[ $offset -ge $slewthresh ]]; then
if [[ $offset -ge $stepthresh ]]; then
ntpdate -b $server
else
now=`date +%s`
elapsed=$(($now-$lastslew))
if [[ $elapsed -ge $slewdelay ]]; then
ntpdate $server
lastslew=$now
fi
fi
fi
sleep $checkinterval
done