Re: should i be worried about these tof01 messages ...

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From: Tonko A. Ljubicic (tonko_at_bnl.gov)
Date: Tue Jan 21 2003 - 09:46:51 EST

On Mon, 20 Jan 2003, Frank Geurts wrote:

>
>
> Tonko Ljubicic wrote:
> >>Tonko -- i repeatedly see these messages from tof01 fly by ... most of
> >>the time tof02 seems to be happy. I am not sure what to think about
> >>these ... (see below)
> >
> >
> > No worries. This stems from other reasons.
> >
> > While I'm discussing TOF, :-) - is there a reason why tof01 would
> > wiggle it's BUSY so that there is a longish BUSY (0.5 s or so...)
> > every few seconds (3-4-5 or so)?
> >
> > Are you doing something in parallel? Writing to your local disk, eh?
>
> the machine checks every minute the tofr HV system and every 10 minutes
> the tofp HV. These jobs however are very low in priority compared to the
> relevant daq processes which run at maximum priority.
>
> I can temporarily stop these monitoring processes so you can check
> whether it makes a difference, just say when ...

No, I'm looking for something every few seconds.

>
> But, what worries me a little, is that i see some times time-outs
> because L2s were missed. This is something I brought earlier today with
> John Mitchell. These time-outs make a processed L0 token time-out while
> waiting for the L2 ... the time-out is set at 2sec.

Do you log them via LOG? I can't see these messages and I'd really like
to. That 2sec could be what I'm looking for...

>
> This has been our mode of operation last year, during Au+Au and p+p
> operations, apparently w/o problems.

It's not a big problem - when TOF is in I loose about 10 Hz on average....

>
> Anyway, the 1st thing I can do is temporarily shut-down the two
> monitoring processes so you can check whether the BUSYs go away .. or not.

We can try it at some point. Leave things as they are and I'll send you
email at some point...

        -- Tonko 

--
Tonko (Ante) Ljubicic                         Email: tonko_at_bnl.gov
Bldg. 510A                                    Tel: +1-631-344-7346
Brookhaven National Lab., P.O. Box 5000       Fax: +1-631-344-4206
Upton, NY, 11973
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