Chris Tyler wrote:
> On Thu, 2012-03-22 at 02:38 +0100, Kevin Kofler wrote:
>> And finally, for our build speed issue, the practical consideration will
>> be whether the parallelism will actually speed our builds up. Right now
>> our builds are either serial or have portions parallelized with "make
>> -j", which assumes a single multi-CPU computer (but the "multi-core" ARM
>> setups actually present themselves as a multi-computer cluster, which is
>> not supported by "make -j", not as a multi-CPU computer), so the
>> parallelism does little to the latency of an individual build (though of
>> course it does help the overall throughput).
>
> Actually, there's both: ARM scales to multiple cores per CPU (dual-core
> and quad-core are common, and very high core counts are on the horizon),
> and vendors are preparing many-CPU boxes (e.g., HP Redstone, with 288
> quad core (+1 management core) systems in 4U).
But there are x86 CPUs with more than 4 cores, and multi-CPU SMP systems
which still present themselves as one (multi-CPU/core) computer. IIRC, our
x86 Koji builders have 16 cores per machine (might be even more by now, not
sure).
Kevin Kofler
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