Why does SPEC use a reference machine for determining performance metrics? What machine is used for SPEC OMP2001 benchmark suites?
A15: SPEC uses a reference machine to normalize the performance metrics used in the OMP2001 suites. Each benchmark is run and measured on this machine to establish a reference time for that benchmark. These times are then used in the SPEC calculations. SPEC OMP2001 uses an SGI 2100 with four 350MHz processors as the reference machine. It takes approximately one-and-a-half days to do a SPEC-conforming run of SPEC OMPM2001 using all four processors on this machine. The performance relation between two systems measured with the OMP2001 benchmarks would remain the same even if a different reference machine was used. This is a consequence of the mathematics involved in calculating the individual and overall (geometric mean) metrics. The SGI reference machine performs at about 1000 SPECompMbase2001.
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