[Kst] Big Ascii file

Peter Kümmel syntheticpp at gmx.net
Fri Dec 6 21:41:03 UTC 2013

On 06.12.2013 12:39, Ben Lewis wrote:
> Hi Peter,
> I can now open the big ASCII file using the settings you recommended. :-)
> Build: x64
> Limit buffer size: 500MB
> Use threads: Yes
> Interpret empty value as: NULL
> I have not tried other settings yet.
> I can load all three columns in just under 10 minutes.

When you have enough memory disable the buffer limit, then the file is only read once.
With buffer limit enabled, for each column the file is read again, and reading is
the bottleneck when you don't have a SSD.

> My only criticism is that the progress bar does not behave as expected when loading multiple columns. When loading all
> three columns I observe the following behaviour:

Should be fixed now.


> Searching for rows: 0-50%
> Reading data.../Parsing data.. 50-100% (quick)
> Reading column 2: 50%
> Reading data.../Parsing data... 50-100% (slow)
> Once loaded, performance is a little slow with the full data set displayed, but after zooming in performance is
> excellent with smooth scrolling and zooming.
> Regards, Ben

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