[EXTERNAL] Request on help for real time plots

Maher, Stephen F. (GSFC-665.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] stephen.f.maher at nasa.gov
Mon Jul 22 16:07:45 BST 2019

(for the record, I (Steve) am using the Dirfile format, not ASCII)

> -----Original Message-----
> From: Kst <kst-bounces at kde.org> On Behalf Of BRISSET, Nicolas
> Sent: Monday, July 22, 2019 11:00 AM
> To: kst at kde.org
> Subject: RE: [EXTERNAL] Request on help for real time plots
> Hi,
> What kind of data format are you using? This can make a difference. In the ASCII
> datasource there are options to limit the RAM consumption, otherwise the
> complete file is mapped into memory, and if it becomes very large and forces
> your PC to swap it could have a significant impact on performance.
> Nicolas
> -----Message d'origine-----
> De : Kst [mailto:kst-bounces at kde.org] De la part de Maher, Stephen F. (GSFC-
> 665.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] Envoyé : lundi 22 juillet 2019
> 16:54 À : kst at kde.org Objet : RE: [EXTERNAL] Request on help for real time
> plots
> Hi Thore,
> We use kst for realtime plotting over long periods of time quite successfully.
> (Multi-channel, multi-KHz, multi-day)
> We have some beefy machines but I don't remember seeing "significant" CPU or
> memory consumption by kst.
> Some tips: don't use points on your plots and change the range and/or
> subsampling.
> Steve
> > -----Original Message-----
> > From: Kst <kst-bounces at kde.org> On Behalf Of Thore Oltersdorf
> > Sent: Monday, July 22, 2019 9:32 AM
> > To: kst at kde.org
> > Subject: [EXTERNAL] Request on help for real time plots
> >
> > Dear all.
> >
> > We are using kst2 for plotting test bench real time data. kst2 is very
> > powerful but it slows down when used for a long period. We were not
> > able to identify how to free RAM (or whatever makes it slow) when this
> > happens. Or is it related to the daily generated raw data file in
> > which the testbench DAQ is appending its data per second? kst2 uses
> > this raw data file and maybe it becomes simply too large?
> >
> > Any help is appreciated. Thanks in advance! Sorry if I have not found
> > it immediately in "known bugs" list or elsewhere. I tried to!
> >
> > Kind Regards.
> > Thore
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