Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 9 Aug 2018 10:31:32 -0500

On 08/08/2018 06:46 PM, Ricardo Cardenes wrote:
> This is a capture from one of the times where the IOC booted all the way
> through:
> 
> tc2-sim-ioc> epicsThreadShowAll
>             PRIORITY
>     ID    EPICS RTEMS   STATE    WAIT         NAME
> +--------+-----------+--------+--------+---------------------+
...
>  0a01000a   70 129        Wmtx 1a010258 timerQueue
>  0a01000b   59 140        Wmtx 1a01025d cbLow
>  0a01000c   64 135        Wmtx 1a01025e cbMedium
>  0a01000d   71 128        Wmtx 1a01025f cbHigh
>  0a01000e   50 149        Wmtx 1a010262 dbCaLink
>  0a01000f   58 141        Wmtx 1a010273 timerQueue
>  0a010010   70 129        Wmtx 1a013619 scanOnce
>  0a010011   60 139        Wmtx 1a01361b scan10
>  0a010012   61 138        Wmtx 1a01361d scan5
>  0a010013   62 137        Wmtx 1a01361f scan2
>  0a010014   63 136        Wmtx 1a013621 scan1
>  0a010015   64 135        Wmtx 1a013623 scan0.5
>  0a010016   65 134        Wmtx 1a013625 scan0.2
>  0a010017   66 133        Wmtx 1a013627 scan0.1
>  0a010018   67 132        Wmtx 1a013629 scan0.05

So based on your earlier story about scan thread priorities the problem
might also be related to the medium priority callback thread cbMedium,
which is a general facility and could be used for any number of things
inside either the IOC or the application. If you can run spy during
boot-up that might confirm that one way of the other.

Whichever thread it turns out to be, getting a stack trace of the thread
at the time is probably the next most useful thing you could do.

- Andrew

-- 
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System