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This report covers work package 2 of the the dCSE Project ``Improving the performance of GWW", carried out at EPCC, The University of Edinburgh. This work package targetted improving the communication performance of the FFT Tranpose operation, a key kernel in GWW calculations. Concurrently with this work, another work package was carried out at the University of Sheffield (Prof. Merlyne De Souza et al) to replace the existing 1D domain decomposition of the FFT grids with a 2D decomposition, futher extending the scalability of the algorithm. Comprehensive discussions of this type of optimisation are documented by e.g. Jagode[1] and Sigrist[2].

Iain Bethune