[sldev] Silly suggestion - improved initial rez time

[Erik Anderson]

I have modified some windows applications of mine to do an mmap instead of
fopen.  One big thing you discover rather quickly is that you don't have to
allocate memory for the files; it's also been described as the fastest way
to access files on windows.  The function isn't called mmap though, it's a
combination of CreateFileMapping and MapViewOfFile.

On 6/14/07, Tateru Nino <tateru.nino at gmail.com> wrote:
>
>
>
> Callum Lerwick wrote:
> > On Tue, 2007-06-12 at 12:02 +1000, Tateru Nino wrote:
> >
> >> Callum Lerwick wrote:
> >>
> >>> On Thu, 2007-06-07 at 13:28 +1000, Tateru Nino wrote:
> >>>
> >>>
> >>>> What if.... on logout, the viewer wrote out a list of currently
> loaded
> >>>> texture assets - the index of the memory cache?
> >>>>
> >>>>
> >>> Actually, after going over the audio engine, I'm beginning to think
> >>> caching uncompressed textures on the filesystem really is a good idea.
> >>> The audio engine currently caches uncompressed sounds on disk, but
> only
> >>> as long as the session.
> >>>
> >>> Don't cache them in RAM at all, any more than necessary. Let the
> >>> filesystem block cache do its job. I can't speak for windows, but on
> >>> unix systems this would be quite efficient and effective.
> >>>
> >>>
> >> You mean, basically, mmap() the whole lot and be done?
> >>
> >
> > I don't know how portable mmap() is, is windows at all capable of it?
> > Plain old fopen should be plenty fast. At least on unix systems.
> >
> Win32 does mmap(), with the exception that you can't (I am told) grow
> the file while it's mapped as you can on other systems.
> You have to unmap it first, grow it, then remap it.
>
> --
> Tateru Nino
> http://dwellonit.blogspot.com/
>
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