Harpertown Performance Preview

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Euler 3D

The CASELab at Oklahoma State is a research group that works with NASA’s Dryden Flight Research Center to study and predict aeroelastic behavior, the interaction between inertial, elastic and aerodynamic forces. One example is flutter – when a lifting surface, such as a wing, oscillates due to aerodynamic forces and structural behavior. A mild flutter might produce a mild buzz in an aircraft, but more severe flutter could destroy an aircraft or other structure: the Tacoma Narrows Bridge collapsed due to flutter induced by a severe wind storm.

Euler 3D is an application developed by Tim Cowan and multithreaded by Charles O’Neill, at CASELab for studying and predicting computational aeroelasticity. It is a multi-threaded, floating point intensive computational fluid dynamics application. The benchmark data set analyzes the airflow over a specific wing configuration. Thanks go to Scott Wasson of Tech Report for sharing this benchmark with us.


Figure 6 – Euler 3D Performance

The performance for Euler 3D mysteriously shows little change. CFD applications are notoriously bandwidth hungry, but Harpertown’s IPC is only 2.7% higher for 8 threads. The problem is that our two MPUs are at different frequencies. According to Scott Wasson, the IPC for a 2.33GHz Clovertown is ~19% higher than a 3GHz model – probably the result of limited bandwidth. Together, this means that the 3GHz Harpertown’s IPC is probably ~20% higher than an equivalently clocked Clovertown.

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