Linux and Unix optisa command
Determine which variant instruction set is optimal to use. The optisa command prints which instruction_set out of the ones specified in the command will perform best on this machine. In this case, "best" is defined by the order in which instruction set names are returned by isalist.
Display results similar to the example below.
usage: /usr/bin/optisa isalist
optisa is preferable to "uname -p" or "uname -m" in determining which of several binary versions of a given program should be used on the given machine.