[LAD] RDF libraries, was Re: [ANN] IR: LV2 Convolution Reverb

[David Robillard]

On Mon, 2011-02-28 at 17:24 +0100, Olivier Guilyardi wrote:
> Hi!
> 
> On 02/26/2011 09:08 PM, David Robillard wrote:
> 
> > Fair enough. The sum of all installed LV2 data loaded into a data
> > structure can be large, though. My new implementation is still not quite
> > optimal, though:
> 
> [...]
> 
> > On Android it's probably not an issue though, as you say. For other
> > embedded situations it would be nice to have absolutely minimal space
> > overhead on top of the actual data itself... plus it's fun :)
> 
> It makes sense indeed to reduce memory usage, but reading the above, I get a
> feeling like parsing the metadata of a typical plugin set won't exceed a few Kb
> of RAM.
> 
> To give you an idea, on a rather old device such as the HTC Magic, you have
> 288Mb of RAM, and when an app is in the foreground you can safely use quite a
> lot of memory.
> 
> There could more constrained embedded situations where plugins are needed,
> although I can't really think about any real-world example ATM.

I will need to make a "load all LV2 data and do nothing" program to
benchmark how much space is used by loading all LV2 stuff. I suspect it
will be a figure workable within 288MB of RAM, but ideally should be
smaller since apps have other things to store, especially when audio is
involved.

> > Fair enough. It seems the libraries involved can be built to be well
> > under 100k with -Os and such, but I have no idea how 64-bit shared
> > library code compares to static android code in terms of size. I'm all
> > for contributions that shave a bit of space, but everything seems pretty
> > good to me now (glib aside).
> 
> Once you remove the glib dep, I should be able to tell you what size I get when
> compiling with the Android NDK. I have checked again, and 100Kb is good in my
> case. FYI, APK packaging uses zip compression.

I would guess it will be at the very least a month before this happens,
unless somebody steps up to do it. The relevant SLV2 release
announcement will mention the glib removal.

-dr