[Libreoffice-bugs] [Bug 84246] Calc crashes on loading / saving large (~500MB) CSV files

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=84246

--- Comment #14 from John Nagle <nagle at animats.com> ---
I'm seeing a similar bug.  Read a 233MB CSV file into Calc without problems.
Attempted to write it out as CSV with slightly different options ("quote
everything"), and it's half done after an hour.  About 2/3 done after an hour
and a half. Progress continues. Calc is in the "greyed out" state, not
processing mouse clicks. 

Since this is on Linux, it doesn't affect other processes much, and I'm letting
this run to see if it finishes. It's not hung; the progress bar advances
slowly. 

CPU utilization 100% of 1 CPU. Very little disk I/O. Memory not full. Not
thrashing. Very little I/O, maybe one disk write every 10 seconds.

This looks like there's something in writing out a CSV file that's worse than
O(1), so it chokes on large files.  Somebody with a debug build should profile
this while writing out a large CSV file and see where it's spending all the CPU
time.

Ubuntu 16.04LTS x64 8GB.  
Calc version: libreoffice-calc 1:5.1.6-rc2.0ubuntu1-xenial2

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