Fwd: [libreoffice-documentation] Multi-threading in Calc

Mike Kaganski mikekaganski at hotmail.com
Thu Apr 23 10:15:58 UTC 2020

On 23.04.2020 13:12, Luboš Luňák wrote:
> On Thursday 23 of April 2020, Stephen Fanning wrote:
>> As for the processing itself, I remain unclear about how Calc allocates
>> tasks to threads. Can we give the user any general advice on how he could
>> structure his spreadsheet to gain the maximum performance benefits from the
>> availability of multiple cores? Or maybe there are ways to organise a
>> spreadsheet that will frustrate Calc's attempts to multi-thread, which we
>> ought to advise against?
>  Technically threads are generally used only for formula groups, which are a 
> sufficient number of adjacent cells in a column that use the same formula 
> (and get different results because of relative cell addressing). In UI terms, 
> write e.g. "=A1*2" to B1, grab the bottom-right corner of the cell and extend 
> down. But it's implementated this way because that's usually how large 
> spreadsheets are created. So I think it's a needless complication to be 
> specific about this.

IMO it's still useful to mention that the optimization is column-based.
Because many people don't realize that row-based layout is potentially
less efficient. This would be beneficial to those who don't create
spreadsheets according to how it's "usually" done.

Best regards,
Mike Kaganski
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