Hitachi Compute Blade 2000 User Manual page 1074

When a processor group is configured by the node, the memory access performance
becomes high. That is because the logical processor of LPARs , like LPAR1 and LPAR2
below, always uses the local memory in configuration where the processor group and
the physical memory in the same node are assigned to the LPAR.
LPAR1
1way
LPAR2
2way
Physical processor
Socket
Core
Physical memory
Node0
When making the processor group in a node and allocating the memory in the same
node, the memory accesses are always performed in the local memory and the
memory cost must be smallest.
Memory access of processors in a shared mode
(processor group configuration)
Logical processor
Time-share
Processor group
small
Node1
1023
Memory access
Memory
access cost
*Shows only the memory access of
LPAR2.
(LPAR1 would be the same. )