Re: [Plplot-devel] setlocale

[Phil R. <p.d...@gm...>]

Sorry, I was wrong in my last email - removing the locale calls from
plP_state as well (used to reset the width after a contour draw within
plshade) I ended up with a 2.5 times speed increase

Phil

On Mon, 29 May 2023 at 00:38, Phil Rosenberg <p.d...@gm...>
wrote:

> Hi all
> I have been making further optimisations to the wxwidgets backen, as I
> have still been finding it painfully slow for plshade calls.
> It turned out that almost all the time within the backend (>99%) was spent
> selecting pens and brushes and allocating memory for every fill within the
> plshade call. Less that 1% was actually spent within the rendering call to
> wxWidgets. I have made some good improvements here.
>
> However, in addition to this, about 50% of the total execution time is
> spent in the setlocale function. This is called before and after each
> polygon fill in the core plplot code.
>
> I wondered if anyone really knows the purpose of these calls? Perhaps they
> are to ensure we have consistent numeric representations across regions? If
> so, then I don't really understand why they are needed for polygon fills.
>
> Any thoughts would be welcome
> Phil
>