A small patch to SlashProcPoller
implementing the strategy you mention.
There is still some averaging on the cpu usage, depending on the
interval on the cpu_usage condition.
Goodluck and thanks for pointing out the issue.
I realy takes a long time for a long running process to get noticed if
it misbehaves on cpu usage with the current cpu_usage implementation
Write the code in a file in your god config's include path and require
the file in your config to test
module God
module System
class SlashProcPoller < PortablePoller
# the poller object is recreated for each pol
# book keeping must be done on class level
@@last_cpu_stats = []# // [pid] => {:run_time, :total_time}
def percent_cpu
stats = stat
total_time = stats[:utime].to_i + stats[:stime].to_i # in
jiffies
run_time = uptime - stats[:starttime].to_i / @@hertz
if run_time == 0
0
else
delta_run_time = run_time
delta_total_time = total_time
@@last_cpu_stats[@pid] ||= {:run_time => 0, :total_time
=>0}
delta_run_time = delta_run_time - @@last_cpu_stats[@pid]
[:run_time]
delta_total_time = delta_total_time - @@last_cpu_stats[@pid]
[:total_time]
@@last_cpu_stats[@pid][:run_time] = run_time
@@last_cpu_stats[@pid][:total_time] = total_time
((delta_total_time * 1000 / @@hertz) / delta_run_time) / 10
end
rescue # This shouldn't fail is there's an error (or proc
doesn't exist)
0
end
end
end
end
On Dec 6, 9:46 pm, pogodan <[email protected]> wrote:
> We're trying to use God to monitor some processes that occasionally
> crash and peg the CPU. In top we see CPU% go to 100 or 200%, but God
> still reports use as only maybe 15-20%
>
> Poking through the code and some linux forums, it seems the CPU stats
> returned by `ps` are historical over the life of the process, while
> calculating realtime stats requires polling, waiting an interval and
> re-polling to compare "jiffies" used over the interval. It looks like
> both God's SlashProcPoller and PortablePoller are basically
> calculating the historical CPU use which is not very helpful for
> occasionally crashing processes
>
> Has anyone made a stab at writing a "realtime" CPU checker?
>
> -
> Paul |http://pogodan.com
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