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