Linux and Unix optisa command
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About optisa
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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.
optisa instruction set
optisa
Display results similar to the below example.
usage: /usr/bin/optisa isalist