[Kst] Out of Memory Error

[Barth Netterfield]

Interesting.

This error triggered when the reader fails to read any points from the file, 
which sounds like some sort of file locking issue with the file system.  I fixed 
something like this elsewhere (that had a high cross section for messing up) 
but this one still exists.

When this happens, it does reset the buffer.
Also, the first time something happens it prints the warning message.  After 
this. the error probably keeps happening occasionally - but it just does so 
silently, and recovers.

I think this should be changed.  

-It isn't clear that the warning message is particularly helpful - except for 
debugging.  Can we just remove it?  Or perhaps disable it after at least one 
successful read.   Either is safe and trivial.

-Guessing that this is a file system access issue, I think that the reader 
should fail quietly, and just try again soon (without resetting) if the read 
fails here - at least for a couple times.

Ben: what is the file system situation?  Remote disk? Other things that might 
be relevant?

Peter: can you decide if you want to disable the error message for 2.0.8.  I 
can co either way on this.  As long as 2.0.8 goes out Monday or sooner.

cbn



On July 19, 2014 1:52:09 PM Ben Lewis wrote:

> Hi Barth and Peter,
> 
> I can send you instructions on how to reproduce this bug. You will need a
> Windows PC (32-bit) and a demo version of TwinCAT
> <http://www.beckhoff.com.au/english.asp?download/default.htm>. I can then
> send you my code to run within TwinCAT. You can them run Kst on the same PC
> or a remote PC.
> 
> Regards, Ben
> 
> On 16/07/2014 10:29 PM, Ben Lewis wrote:
> > Hi Peter,
> > 
> > This is the error I get, usually within the first two or three minutes of
> > plotting live data. It happens every time but only ever once per file. It
> > appears to trigger a complete reread of the data source.
> > 
> > 
> > 
> > Regards, Ben
> > 
> > On 15/07/2014 10:16 PM, Ben Lewis wrote:
> >> Hi Peter,
> >> 
> >> I haven't got access to my data logger tonight. I'll check tomorrow and
> >> get back to you.
> >> 
> >> Regards, Ben
> >> 
> >> On 15/07/2014 3:54 PM, Peter Kümmel wrote:
> >>> On 14.07.2014 13:39, Ben Lewis wrote:
> >>>> Hi Kst,
> >>>> 
> >>>> I've just tested the latest build of Kst and I'm still getting the "out
> >>>> of memory" error. See
> >>>> http://kde.6490.n7.nabble.com/Out-of-memory-error-td1555215.html for
> >>>> details.>>> 
> >>> Now there is no message with "out of memory" any more. Which one did you
> >>> see now?>>> 
> >>>> I know Peter has spent some time looking into this but was not able to
> >>>> resolve this problem. I thought the problem was
> >>>> unique to my paricular set up so I thought it would be ok to let it go.
> >>>> But a college of mine has just tried Kst for the
> >>>> first time, on a different computer, and is getting the same error.
> >>>> Also he was using a local data source, whereas I was
> >>>> using a remote data source. We are both using the 32-bit version of Kst
> >>>> on a Windows PC.
> >>>> 
> >>>> I thought I should mention this just in case this should be fixed
> >>>> before releasing 2.0.8.
> >>>> 
> >>>> I'm happy help out in any way I can.
> >>>> 
> >>>> Regards, Ben
> >>>> _______________________________________________
> >>>> Kst mailing list
> >>>> Kst at kde.org
> >>>> https://mail.kde.org/mailman/listinfo/kst
> >>> 
> >>> _______________________________________________
> >>> Kst mailing list
> >>> Kst at kde.org
> >>> https://mail.kde.org/mailman/listinfo/kst

-- 
Barth Netterfield
University of Toronto
416-845-0946