dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

I have noticed that too. My dolfinPYTHON_wrap.cxx is now 6 MB large. A couple 
of years ago I tried to trim it from some 5Mb to 3ish. But I guess it has 
steadily increased. I do not think there are any magic bullet to decrease it 
drastically more than doing something in the line you suggests.

The SWIG interface is built so it should (in theory) be possible to generate, 
one extension module for each "kernel module". We have a pre_foo.i and a 
post_foo.i where all the module specific specializations are done. These 
together with global typemap files are more or less what is used to generate 
the extention module. The global files can be shared among the splitted 
extension modules.

I wrote in theory because it has actually not been done. I predict all kindoff 
problems, with circular dependencies and lack of correct forward declarations 
beeing the worst ones. I also think it will result in an overall larger memory 
signature during runtime. This is because of duplication of generated code in 
each of the extension modules.

The issue of splitting the dolfin extension module has come up before, and 
there are compelling reasons to do it. Can Kent and maybe Ola enlight us on 
more potential issues with doing this (in addition to someone(TM) actually 
have to do it... :P).

Johan

On Tuesday May 17 2011 07:12:47 Kristian Ølgaard wrote:
> Hi,
> 
> Lately I've noticed that compiling the Swig generated cpp file exhaust my
> memory (1GB) and uses up to 60% of the swap which means compiling DOLFIN
> takes around 30min.
> In addition, the single cpp file represents a bottleneck when
> compiling using multiple processes.
> 
> Will it be possible to let Swig generate multiple files instead, and
> link those into a
> Python module?
> 
> Kristian
> 
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