[arm-allstar] High CPU

[Doug Crompton]

Just to add to that as Dave and I have talked about this for several years
now.  I would basically disregard load averages on the Pi. They are not
representative of actual CPU loading. The best way to determine CPU is
loading is to watch the temperature using  cpu_stats.sh  Assuming you have
stable ambient temperatures where the Pi is located the changes in CPU
temperature are an indication of load. The Hamvoip code is really not very
stressful on the CPU even with large numbers of connections. If you really
want to see load some of the test programs will put the CPU into a
frequency fold back state with temperatures over 85C! Assuming a 72F
ambient a Pi with heatsinks and a fan should never go out of the the green
region running Allstar. My heavily loaded Pi 4 turbo mode hubs run in the
low 40's C all the time. Of course if your ambient is higher then you would
likely see higher CPU temperatures.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Fri, Jan 24, 2020 at 5:17 AM "David McGough via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

>
> Hi Bryan,
>
> The answer to this question is simply that the "load average" numbers show
> more that just CPU use. Under Linux, the load average is a combined number
> including CPU usage, I/O usage, VM wait conditions (like swapping) and
> time spent where a program is waiting on system resources (like
> uninterpretable wait conditions), etc. It's easy to produce a program that
> generates a 1.0 load average, while using virtually no CPU time or other
> system resources.
>
> The vmstat program (man vmstat) is one which will probably give you a
> better picture of actual system utilization.
>
> And, I just googl'ed the subject and found some possibly useful web pages
> with more in-depth discussion:
>
>
> https://unix.stackexchange.com/questions/393566/what-does-proc-loadavg-s-cpu-and-io-utilization-mean
>
> http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html
>
>
> 73, David KB4FXC
>
>
>
>
> On Thu, 23 Jan 2020, "Bryan St Clair via ARM-allstar" wrote:
>
> > All,
> >
> > I have noticed a higher than normal CPU load on my Pi.  Running 1 radio
> and
> > a 2nd radioless setup, streaming too.
> >
> > Loads are always in the .30+ range and I have seen them in the .70+ a few
> > times.  Maybe I'm getting old, but I don't really remember them over even
> > .10 most days.
> >
> > Pi 3B, no real changes of recent, updates performed this week, current
> > build.
> >
> > What CPU loads are you seeing? I was checking on CLI.
> >
> >
>
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