These machines share data by direct access.
-
Potentially conflicting accesses must be protected by synchronization.
-
Simultaneous access to the same memory bank will cause contention, degrading performance.
-
Some access patterns will collide in the network (or bus), causing contention.
-
Many machines have caches at the processors.
-
All these features make it profitable to have each processor concentrate on one area of memory that others access infrequently.
|
