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Scalasca is a performance optimisation tool for parallel programs and available under the New BSD open-source license.

It measures and analyses the runtime behaviour to find potential performance bottlenecks, especially concerning communication and synchronisation. The main targets are mainly scientific MPI and OpenMP applications (and hybrids of the two) and large-scale systems. The current version was also optimised for the use with the Score-P infrastructure. For further information please visit the official Scalasca website.