How will Linux be leveraged in next-gen supercomputers? (NewsForge) [LWN.net]

How will Linux be leveraged in next-gen supercomputers? (NewsForge)

Posted Sep 27, 2005 8:21 UTC (Tue) by drag (subscriber, #31333)
In reply to: How will Linux be leveraged in next-gen supercomputers? (NewsForge) by dlang
Parent article: How will Linux be leveraged in next-gen supercomputers? (NewsForge)

Cool.

Linux rocks. :P

Pretty soon we will be all running Numa kernels anyways.

Take a dual socket AMD64 board, which is nice enough to have a seperate memory bank for each memory controller, and then stick 2 dual core cpus on it. Instant complex numa machine. 4 cores.. 2 cores share one level of cache and main memory on one half, the other 2 on the other with the ability to access each other's stuff in a pinch.

Fun stuff.

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How will Linux be leveraged in next-gen supercomputers? (NewsForge)

Posted Sep 27, 2005 9:02 UTC (Tue) by joib (guest, #8541) [Link]

Actually, the dual core AMD64:s don't share cache. Each core has a separate 1 MB (or 512 on some of the lower end desktop models) L2 cache. Although AFAIK they are able to copy stuff directly between caches without having to go via main memory.