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List:       kde-optimize
Subject:    memory usage vs libvorbisenc
From:       Dirk Mueller <mueller () kde ! org>
Date:       2003-12-26 20:33:14
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Hi, 

I've had a look at the unshared, read/write memory maps of typical kde 
environment, and I noticed that arts, when vorbis is detected, links against 
vorbisenc unconditionally. That means knotify and artsd, which are running in 
a typical environment, are each eating 900kb of unshared, non-pic data (that 
means hundreds of relocations to resolve during startup). 

Even worse, any app using arts is going to require this lib, like kolf, 
kwifimanager, or the audiopreview-kfile-plugin. 

So in a typical setup we waste about 2 MB of memory, when using kwifimanager 
or the audiofilepreview (that means each konqueror filemode instance) adds 
another MB. 

The cause is a very badly coded accoustic model embedded in libvorbisenc as 
unshared, non-pic data. I've spend some hours recoding the lib, but gave up 
for now. 

does anyone see a chance of being able to dlopen this lib when necessary? I 
don't think I ever encoded a vorbis file myself, and I don't think I will 
ever, and this is the same for a large amount of people. Therefore I think 
wasting 2 MB of memory is too much, especially for lowend hardware. 


Dirk
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