Adaptive control in rollforward recovery for extreme scale multigrid

With the increasing number of compute components, failures in future exa-scale computer systems are expected to become more frequent. This motivates the study of novel resilience techniques. Here, we extend a recently proposed algorithm-based recovery method for multigrid iterations by introducing an adaptive control. After a fault, the healthy part of the system continues the iterative solution process, while the solution in the faulty domain is re-constructed by an asynchronous on-line recovery. The computations in both the faulty and healthy subdomains must be coordinated in a sensitive way, in particular, both under and over-solving must be avoided. Both of these waste computational resources and will therefore increase the overall time-to-solution. To control the local recovery and guarantee an optimal re-coupling, we introduce a stopping criterion based on a mathematical error estimator. It involves hierarchical weighted sums of residuals within the context of uniformly refined meshes and is well-suited in the context of parallel high-performance computing. The re-coupling process is steered by local contributions of the error estimator. We propose and compare two criteria which differ in their weights. Failure scenarios when solving up to $6.9\cdot10^{11}$ unknowns on more than 245\,766 parallel processes will be reported on a state-of-the-art peta-scale supercomputer demonstrating the robustness of the method

Ku nowemu rozumieniu relacji między szkolnictwem wyższym a światem pracy

In the perspective of the last few decades, the authors discuss the problem of relationships between higher education institutions and the labour market. Observations indicate that this problem appears periodically and comes to life in certain situations both in public debates and in the context of scientific research. The article contains a thorough analysis of the determinants of the phenomenon - in the global and regional aspect - and points out the multifaceted, predictable consequences for higher education institutions of a closer tie with the economy and - on the other hand - of the expansion of education for economic growth.Autorzy omawiają problem relacji występujących pomiędzy instytucjami szkolnictwa wyższego a rynkiem pracy w perspektywie ostatnich kilku dekad. Z poczynionych obserwacji wynika, że problem ten pojawia się cyklicznie i ożywa w określonych sytuacjach, zarówno w publicznych debatach, jak i na gruncie badań naukowych. Artykuł zawiera wnikliwą analizę uwarunkowań zjawiska - ujmowanych w aspekcie globalnym oraz regionalnym - ze wskazaniem wielorakich, możliwych do przewidzenia konsekwencji dla instytucji szkolnictwa wyższego, ściślejszego powiązania edukacji z gospodarką, a także - z drugiej strony - ekspansji edukacyjnej służącej rozwojowi gospodarczemu