Exascale not arriving fast enough because it is way more difficult than ten years ago when we wanted to reach petascale? Paul Messina doubts whether petascale was easier. For instance, also energy efficiency was an issue already 10 years ago. Paul Messina, Director of Science at Argonne Leadership Computing Facility, is interviewed in Scientific Computing. "In summary, in my opinion, many challenges posed by technology trends are not fundamentally different from those posed by previous transitions. Instead of wringing our hands and claiming we need to abandon our current technologies (hardware and software writ large), we should examine carefully the software ecosystem that works and is widely used today and then decide what to throw out, what to refine/adapt, and what may require inventions", Messina tells to Scientific Computing.
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