Luis Cebamanos

• MSc MPhil High Performance Computing
• Consultant at University of Edinburgh

Fortran coarrays are an attractive alternative to MPI due to a familiar Fortran syntax, single sided communications and implementation in the compiler. Scaling of coarrays is compared in this work to MPI, using cellular automata (CA) 3D Ising magnetisation miniapps, built with the CASUP CA library, https://cgpack.sourceforge.io , developed by the a...

One of the main hurdles of partitioned global address space (PGAS) approaches is the dominance of message passing interface (MPI), which as a de facto standard appears in the code basis of many applications. To take advantage of the PGAS APIs like global address space programming interface (GASPI) without a major change in the code basis, interoper...

Fortran coarrays are an attractive alternative to MPI due to a familiar Fortran syntax, single sided communications and implementation in the compiler. Scaling of coarrays is compared in this work to MPI, using cellular automata (CA) 3D Ising magnetisation miniapps, built with the CASUP CA library, https://cgpack.sourceforge.io, developed by the au...

A 3D multi-scale cellular automata finite element (CAFE) frame-work for modelling fracture in heterogeneous materials is described. The framework is implemented in a hybrid MPI/Fortran coarray code for efficient parallel execution on HPC platforms. Two open source BSD licensed libraries developed by the authors in modern Fortran were used: CGPACK,...

One of the main hurdles of a broad distribution of PGAS approaches is the prevalence of MPI, which as a de-facto standard appears in the code basis of many applications. To take advantage of the PGAS APIs like GASPI without a major change in the code basis, interoperability between MPI and PGAS approaches needs to be ensured. In this article, we ad...

One of the main hurdles of PGAS approaches is the dominance of MPI, which as a de-facto standard appears in the code basis of many applications. To take advantage of the PGAS APIs like GASPI without a major change in the code basis, interoperability between MPI and PGAS approaches needs to be ensured. In this article we consider an interoperable GA...

One of the main hurdles of a broad distribution of PGAS approaches is the prevalence of MPI, which as a de-facto standard appears in the code basis of many applications. To take advantage of the PGAS APIs like GASPI without a major change in the code basis, inter-operability between MPI and PGAS approaches needs to be ensured. In this article, we a...

Nuclear materials are subjected to demanding environments, encountering high temperature gradients and fast neutron fluxes that gradually damage its structure and therefore change the material properties. Some components of a nuclear reactor determine its lifetime , such as the graphite core and steel pressure vessel for fission reactors. In case o...

We have developed miniapps from MPI finite element library ParaFEM and Fortran 2008 coarray cellular automata library CGPACK. The miniapps represent multiscale fracture models of polycrystalline solids. The software from which these miniapps have been derived will improve predictive modelling in the automotive, aerospace, power generation, defense...

Coarrays are a Fortran 2008 standard feature intended for SIMD type parallel programming. The runtime environment starts a number of identical executable images of the coarray program, on multiple processors, which could be actual physical processors or threads. Each image has a unique number and its private address space. Ordinary variables are pr...

Accelerators and, in particular, Graphics Processing Units (GPUs) have emerged as promising computing technologies which may be suitable for the future Exascale systems. However, the complexity of their architectures and the impenetrable structure of some large appli- cations makes the hand-tuning algorithms process more challenging and unproductiv...

Accelerators and, in particular, Graphics Processing Units (GPUs) have emerged as promising computing technologies which may be suitable for the future Exascale systems. However, the complexity of their architectures and the impenetrable structure of some large applications makes the hand-tuning algorithms process more challenging and unproductive....

Quantification of the contribution of genetic variation to phenotypic variation for complex traits becomes increasingly computationally demanding with increasing numbers of SNPs and individuals. To meet the challenges in making feasible large scale studies, we present the REACTA software. Adapted from ACTA (and, in turn, GCTA), it is tailored to ex...

GPUs are devices highly optimized for a small set of graphic operations.  Originally designed for computing gaming industry GPUs work as accelerator to CPUs, that is:  Most part of code is executed by CPUs  Computational expensive kernels run on GPUs The key of the GPUs success relies on a large number of cores executed in parallel, low latency...