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<== Date ==> <== Thread ==>

Subject: Re: striptool strangeness
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: "Laznovsky, Michael" <lazmo@slac.stanford.edu>
Cc: TECHTALK <tech-talk@aps.anl.gov>
Date: Mon, 26 Sep 2005 09:47:18 +0200
That happens when the data range (here: 4.7e4) is much larger than the axis range (here: 100). This seems to be a bug in the Striptool display routine. I have seen this effect often.

Dirk

Laznovsky, Michael wrote:
Hi all-

For a while now I've noticed an odd effect in one of my ongoing striptool
charts... one of the PVs I follow starts at zero when an IOC is booted and just counts up from there, one step every 3.7 seconds or so, as you can see on this full-scale chart ("LM20:DATA:COUNT", the diagonal maroon line):


http://www-user.slac.stanford.edu/lazmo/tmp/lm20-stripbug2.gif

But when striptool is set to user-specified axis limits, that PV mysteriously
keeps regularly reappearing in the interval (0,100) as though it had been
reset to zero:

http://www-user.slac.stanford.edu/lazmo/tmp/lm20-stripbug.gif

The phantom period looks to be about 5.5 hours, which translates to about
19800 seconds, or 5300 counts of the PV; apparently not an obvious power-of-2 wrap-around effect in this case.


Haven't seen any other PVs do this, but then I don't follow any other
monotonically-increasing ones.  No big deal, unless it reveals some underlying
bug that may be subtly affecting other displays.

Any ideas??

thanks, Mike

-----
Michael P. Laznovsky                         mailto:lazmo@slac.stanford.edu
Application Software Developer, ESD                     ofc: (650) 926-2924
Stanford Linear Accelerator Center, MS-46               fax: (650) 926-3515
2575 Sand Hill Road, Menlo Park CA 94025 USA   http://www.slac.stanford.edu


-- Dr. Dirk Zimoch Swiss Light Source Paul Scherrer Institut Computing and Controls phone +41 56 310 5182 fax +41 56 310 4413

References:
striptool strangeness Laznovsky, Michael

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