#40542: Altas build fails during Octave install ---------------------+--------------------- Reporter: andy@… | Owner: vince@… Type: defect | Status: new Priority: Normal | Milestone: Component: ports | Version: 2.2.0 Resolution: | Keywords: Port: atlas | ---------------------+--------------------- Comment (by vince@…): Andy, there seems to be a lurking bug with ‘mpclang33’ during Atlas compilation on the machine you’re using. Can you give me more informations, e.g. the processor of your computer? Atlas takes a long time, because it is all about optimization. For each elementary matrix operation that builds up the library, Atlas tries a bunch of different values (cache size, number of registers used, preloading, etc.) and picks up the one that gives the best performance. Since sometimes there are more than a thousand possible combinations, it takes a moderately long time to test the whole set and pick up the most efficient. Multiply this by every operation, knowing that each operation can be carried out in four precisions: single (s), double (d), single complex (c), double complex (z), each one optimized with its own values. Moreover, to avoid thread interference, Atlas carries out its measures using a single threaded model, meaning that even with 32,768 cores, for example, it would not compile faster. Now, I will try to dig further to see what’s happening. -- Ticket URL: <https://trac.macports.org/ticket/40542#comment:6> MacPorts <http://www.macports.org/> Ports system for OS X