[ubuntu-mythtv] Higher load averages after upgrade to mythbuntu 12.04/Mythtv 0.25

Eric Shubert ejs at shubes.net
Mon May 14 22:24:39 UTC 2012 

It's true that load doesn't tell the whole story. Waiting for i/o will 
drive the load numbers up. You should see higher %wa for the cpu when 
there's a lot of waiting going on. It's possible to achieve high load 
numbers (in the 10-30 second range) with i/o bound processes utilizing 
very little cpu, for instance when syncing a raid-1 mirror.

-- 
-Eric 'shubes'

On 05/13/2012 09:42 AM, Nick Caldwell wrote:
> Top didn't really show anything using the CPU all that much that I could
> tell. Also my cpu fan didn't turn up to higher speeds, which normally
> that load average for any more than a few minutes would at least kick it
> up a notch or two. Right now it is sitting "idle" at 0.5 which I would
> still consider higher than it should be, top showing mythfrontend and
> mythbackend using 1% of the cpu and nothing else really anything. Isn't
> the load average more than just cpu usage and can be impacted by io
> waits and other factors? Maybe there isn't something sitting in the cpu
> queue but instead waiting for some sort of io that is delayed, and would
> also explain why the load is higher but my cpu is not hotter.
>
>
> On Sun, May 13, 2012 at 7:49 AM, Eric Shubert
> <ejs at shubes.net
> <mailto:ejs at shubes.net>> wrote:
>
>     After the update, was it perhaps building locate or man page
>     indexes? Or maybe some other background activity?
>
>
>     On 05/10/2012 08:35 PM, Nick Caldwell wrote:
>
>         Actually it looks like the numbers are a bit lower than they
>         were when I
>         first installed, but still higher than I would think and idling
>         machine
>         should be at. I am running 3.2.0-24 kernel. When I first
>         installed this
>         version the load average was between .7 and .8, I have run Myth
>         back to
>         .22 I think? I don't remember them ever being that high just at
>         idle.
>         Today they are in the .3s. When I took this my box had only been
>         up 3.5
>         hours, it turns itself on right before I get home and shuts
>         itself off
>         late on work nights, so I generally don't have it up for more than 3
>         days at a time over a weekend.
>
>           From /proc/cpuinfo:
>         vendor_id       : AuthenticAMD
>         cpu family      : 15
>         model           : 35
>         model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
>         stepping        : 2
>
>
>         Inline image 1
>
>
>         On Thu, May 10, 2012 at 11:57 AM, Cliff Dunn
>         <alldunn at gmail.com
>         <mailto:alldunn at gmail.com>
>         <mailto:alldunn at gmail.com
>         <mailto:alldunn at gmail.com>>> wrote:
>
>             I don't know if my top screenshot came through on my last
>         email, but
>             I am attaching it again if not.  It appears that Mythfrontend is
>             using the majority of the cpu.  I haven't actually tried killing
>             that process yet to see if the load comes down to something
>         I would
>             expect.  I would definitely be interested in your numbers.
>           And like
>             you I have dual HD ATSC tuners on my backend/frontend combo.
>           I have
>             noticed the load up to and above 2.00 since the upgrade on that
>             machine during recording/watching TV.  The machine seems to
>             definitely be keeping up but I am obviously nearing my
>         threshold on
>             my dual core proc.  Seems like such unnecessary high utilization
>             when I was seeing things so low before the upgrades.
>
>
>             On Thu, May 10, 2012 at 2:43 PM, Nick Caldwell
>         <kg6nmp at gmail.com
>         <mailto:kg6nmp at gmail.com>
>         <mailto:kg6nmp at gmail.com
>         <mailto:kg6nmp at gmail.com>>> wrote:
>
>                 I did the upgrade about two weeks ago and noticed the same
>                 thing. I did a clean install of Mythbuntu 12.04, my load
>         average
>                 was pretty low, 0.10s or something (in previous
>         versions) when
>                 it was doing nothing and now it sits around 0.8 to 1.0 when
>                 doing nothing. I have dual hdtv inputs and it still
>         seems to be
>                 able to keep up recording on both and playing back a
>         recording
>                 while running mythcomflag, so I haven't really concerned
>         myself
>                 with it. Also my cpu fan does not turn on to higher
>         speeds even
>                 though typically it would, so I presumed the load number
>         is just
>                 wrong, and not that the load is really that high. If I
>         look at
>                 top or iotop they are sitting pretty idle as well.
>
>                 I also have an AMD CPU, I forget which exact one but I
>         can send
>                 my system info once I get home if it helps. I presume
>         this to be
>                 an ubuntu problem though.
>
>                 Nick
>
>                 On Thu, May 10, 2012 at 10:23 AM, Cliff Dunn
>         <alldunn at gmail.com
>         <mailto:alldunn at gmail.com>
>         <mailto:alldunn at gmail.com
>         <mailto:alldunn at gmail.com>>> wrote:
>
>                     I have noticed that after I updated from Mythbuntu
>         11.10 and
>                     MythTV 0.24 to 12.04/0.25 that my load averages are much
>                     higher. I am running AMD Athlon X2 260 processor.
>         Before the
>                     upgrade, with Mythfrontend idle, I would see a load
>         average
>                     of no more than 0.05. Now I am seeing the below
>         average when
>                     idle with much higher loads when actually watching
>                     something. I am curious if you guys have noticed
>         anything
>                     similar?
>
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>     --
>     -Eric 'shubes'
>
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