Option to "tail -f" ASCII file

BRISSET, Nicolas nicolas.brisset at airbus.com
Fri Mar 1 17:13:15 GMT 2019


Kst does not reload the files entirely, it parses them and keeps a pointer to the last processed line, and resumes from there in case new data arrives.
It may become slow with large amounts of data, your best bet is to tune the memory options available in the data wizard to avoid using up too much memory, which could lead your PC to swapping and that could make it slow.
What amount of data (size of ASCII file, number of columns, number of lines) are you dealing with, and in which form are they ploted (lines are much better optimized than points)?


De : Kst [mailto:kst-bounces at kde.org] De la part de Scott Armitage
Envoyé : jeudi 28 février 2019 17:27
À : kst at kde.org
Objet : Option to "tail -f" ASCII file

Is there an option to follow ASCII files instead of reloading them in their entirety? Would this be a relatively straightforward addition?

I have a set of Python tools that generate CSV log files of telemetry, which are used by post-processing analysis tools. I recently started using Kst2 to visualize the data in real time. This works excellently! However, as the CSV files grow, Kst2 becomes sluggish as it reloads the entire file as new lines are written. In my environment, I know that these are output files that only grow, like log files. An option to follow the files, similar to "tail -f", would I think dramatically improve Kst2's performance in plotting these files in real time.
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