Numa

See also: Numa

In Data-processing, NUMA is the English acronym of Non Uniform Memory Access or Non Uniform Memory Architecture , meaning nonuniform access report respectively and nonuniform architecture memory . It is about an architecture memory of system Multiprocesseur where the zones memory separate and are placed in various places (and various buses) with respect to each processor, the access times differ according to the reached zone.

NUMA was conceived to mitigate the limits of the architecture SMP in which all the memory capacity is accessible by a single bus generating from the problems of competitor accesses by the various processors. It is particularly necessary for the systems having many processors (generally more than 8 or 12 processors).

NUMA can be seen like a stage between the SMP and the clustering (various machines).

ccNUMA is acronym of “coherent mask” NUMA. By abuse language and use, both became synonymous.

Concepts

  • a node is a unit memory capacity + processor (S) + Entrées/sorties located on the same bus
  • the distance expresses the number of “passages” of a node to another (it thus induces the concepts of latency and flow)

Internal bonds

External bonds

  • NUMA FAQ

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