On Sun, May 20, 2012 at 2:20 PM, Vincent Habchi <[email protected]> wrote:
> Jasper, > > > MacPorts config is: > > […] > > That’s not a configuration problem, it is just a matter of what exactly > the port upgrade has done. Try to update manually (port -v install atlas > +gcc45). > Will do that tonight. > > Atlas can take a very long time to build if you don’t choose one of the > GCC compilers with x86_64 arch. Any other combination (use of clang, or non > x86_64 build) triggers the timing mechanism: Atlas finds out by itself what > is the best set of parameters for each kernel by compiling hundreds of > combinations and measuring their efficiency. This is a long process (it > took around five hours on the Lion Buildbot), but guarantees near > optimality on a per machine (CPU, memory…) per compiler basis at the end. > > If you use clang and build universal, for instance, compiling Atlas might > take over ten hours I see > if you have a Core2Duo machine. > I have *Processor* 2.8 GHz Intel Core 2 Duo *Memory* 4 GB 1067 MHz DDR3 *Graphics* NVIDIA GeForce 9400M 256 MB *Software* Mac OS X Lion 10.7.4 (11E53) > > Vincent
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