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Cache Coherent Non-Uniform Memory Architecture

Non-Uniform Memory Access or Non-Uniform Memory Architecture (ccNUMA) is a computer memory design used in multiprocessors, where the memory access time depends on the memory location relative to a processor. Under ccNUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors. ccNUMA architectures logically follow in scaling from symmetric multiprocessing (SMP) architectures.


Their commercial development came in work by Burroughs (later Unisys), Convex Computer (later Hewlett-Packard), Silicon Graphics, Sequent Computer Systems, Data General  (later EMC) and Digital during the 1990s. Techniques developed by these companies later featured in a variety of Unix-like operating systems, and somewhat in Windows NT.


The ccNUMA designs used by Convex, Sequent and Data General were developed by the the Numascale team that now has made a modernized design for Hypertransport.


→Numascales new ccNuma concept

The Change is on

From Cluster
shared memory with ccnuma by numachip
To Scalable ccNUMA SMP
Cache Coherence - ccNuma - Clusters - Coherent - Directory Based Cache Coherence - Hypertransport - InfiniBand - Numa - NumaChip - Numascale - Snooping