On 07/19/2012 11:26 AM, Michael Meeks wrote:
On Thu, 2012-07-19 at 16:04 +0200, Michael Stahl wrote:
i'm saying it doesn't benefit from the "sophisticated" optimizations that
vendor compilers like SunStudio or Intel do that speed up your BLAS
stuff with gigabytes of floating point arrays by X times because office
suites don't contain gigabytes of floating point arrays.
So - Kohei has been working for years to turn Calc spreadsheets into
gigabyte arrays of floating point numbers - precisely to take advantage
of this sort of optimisation :-)
Just wrote a blog post explaining some of that.
http://kohei.us/2012/07/20/mdds-multi_type_vector-explained/
Almost 2 years in the making (well, that also includes one year of just
thinking about it idly with no code), I'm glad I've finally got this one
off my shoulder. :-)
But no doubt more work is ahead to further optimize this structure.
Also, ScMatrix's new backend now uses it. My hope is to use ScMatrix as
a test-drive and try to get all its kinks sorted out before using this
to store cells in ScColumn.
Best,
Kohei
--
Kohei Yoshida, LibreOffice hacker, Calc
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