Chapter 5 Memory classes

Table of Contents

Chapter 2 discusses the partitions of physical memory available on Hewlett-Packard SMP servers.

For nonscalable SMP systems, there is only one partition, hypernode-local memory, which is accessed using the thread_private and node_private virtual memory classes. All other memory classes are automatically mapped to the node_private memory class. For applications that will be ported to HP scalable SMPs, all five memory classes can be useful.

For multinode, scalable SMP systems, there are three partitions:

Hypernode-local memory, which is accessed via the thread_private and node_private virtual memory classes.
System-global memory, which is accessed via the near_shared, far_shared and block_shared virtual memory classes.
CTIcache physical memory, which holds copies of shared-memory data that is not resident in the hypernode's physical memory, but is accessed by threads running on the hypernode.




	NOTE: The memory classes discussed here are of interest to programmers who wish to manually optimize their shared-memory programs by using compiler directives or pragmas to partition memory and otherwise control compiler optimizations as discussed in Chapter 6, "Chapter 6 “Advanced shared-memory programming”."

Chapter 5 Memory classes

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