On 03/23/2012 08:18 PM, Kevin Kofler wrote: > DJ Delorie wrote: >>> always with the caveat that you can't just use "make -j 288" on them. >> >> Why not? Multi-CPU machines is very old technology. > > Ask the people who designed those machines. > > (My guess: memory and bus bandwidth. There's a limit to how many cores you > can put on a shared-memory, shared-devices machine.) This is true. In the case of Cortex-A9 there are limits to how many fully coherent cores exist within a given CPU "cluster" (on-chip). There are also limits to coherency domains that generally mean you can't do multi-socket coherency on practical 32-bit implementations. In the case of 64-bit, one of the vendors at least has publicly announced an intention to support fully coherent multi-socket domains. But in the interim, we're going to have typically 4 core systems, and many of them. Jon. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
