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- determine which variant instruction set is optimal to use
optisa 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(1). Possible values for instruction_set are given in isalist(5).
See attributes(5) for descriptions of the following attributes:
The following exit values are returned:
One of the instruction_set values you specified is printed by this command.
There is no output; that is, this machine cannot use any instruction_set that you specified with the optisa command.
optisa is preferable to uname -p or uname -m (see uname(1)) in determining which of several binary versions of a given program should be used on the given machine.