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+papi (Performance Application Programming Interface)
+
+PAPI provides the tool designer and application engineer with a
+consistent interface and methodology for use of the performance
+counter hardware found in most major microprocessors. PAPI enables
+software engineers to see, in near real time, the relation between
+software performance and processor events.
+
+In addition, PAPI provides access to a collection of components that
+expose performance measurement opportunites across the hardware and
+software stack.