[Mesa-dev] Improving ralloc performance for the GLSL compiler

[Emmanuel Gil Peyrot]

On Wed, Aug 31, 2016 at 05:39:20PM +0300, Eero Tamminen wrote:
> Hi,

Hi,

> 
> On 31.08.2016 16:37, Marek Olšák wrote:
> ...
> > OK. I'm afraid malloc/calloc/realloc/free from libjemalloc.so will
> > conflict with libc and Steam.
> >
> > When building jemalloc from source, there is an option to add a function prefix.
> > 
> > There are basically two options at the moment:
> > - my allocator: is faster, has much higher memory usage, but is simple
> > to integrate.
> > - jemalloc: should have reasonable memory usage, but it's not clear
> > yet how to integrate it with Mesa.
> 
> If static library is used, symbols get resolved at build time, so that isn't
> a problem.  If distro's static version isn't build with -fPIC, linking it to
> a library wouldn't be nice though (code relocations would dirty text/code
> memory mappings when library is loaded).

jemalloc will always name its static library libjemalloc_pic.a when it
is compiled with -fPIC, and libjemalloc.a when it isn’t.  By default it
compiles both, but distributions may install only a subset of what’s
built (ArchLinux only ships the _pic one for example).

-- 
Emmanuel Gil Peyrot