02-23-2013
A short answer is:
speed and energy consumption.
Also, POWER7 supports SMT4 while POWER5 and POWER6 only support SMT2 (processor super scaling).
There are major architecular differences, but they are binary compatible (p 5 -> p6 -> p7).
Applications compiled using shared libraries usually work over hardware and AIX levels, but with static libraries you may have issues when changing AIX levels.
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LEARN ABOUT OSF1
pset_assign_cpu
pset_assign_cpu(1) General Commands Manual pset_assign_cpu(1)
NAME
pset_assign_cpu - Assigns a processor to a processor set
SYNOPSIS
/usr/sbin/pset_assign_cpu pset_id processor [processor...]
/usr/sbin/pset_assign_cpu -a pset_id number
OPTIONS
Adds the specified number of processors (number) to the specified processor set (pset_id) from the default processor set.
DESCRIPTION
The pset_assign_cpu command assigns one or more processors to an existing processor set. The pset_id variable is a unique integer that
identifies the processor set and is returned by the pset_create command. The processor variable is a unique integer that identifies the
processor. Each processor that is assigned to an existing processor set is removed from its current processor set. The boot processor
cannot be assigned.
Processor assignments are logged in the /var/adm/wtmp file.
FILES
SEE ALSO
Commands: pset_destroy(1), pset_create(1), pset_assign_pid(1), pset_info(1)
Files: processor_sets(4)
pset_assign_cpu(1)