Philippos Papaphilippou

Welcome to the PRACE Summer of HPC website! My name is Philippos and I am one of the current participants. I have done my Bachelor in Computer Science at the University of Cyprus and my Master in Advanced Computer Science

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A Matryoshka linear solver

As I described in my previous posts, solving a linear system in a lattice QCD applications can be a very long process. We really want to optimize this linear solver, so we can find some answers about matter in our

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Linear solvers are behind lattice QCD

In my first post I told you about the wonders of lattice QCD, and I explained why we need supercomputing to actually solve problems involving very small particles. I told you about huge machines that can do in one second

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The wonders of the subatomic world: tiny particles and huge computers.

Note: On monday I started working on the PRACE Summer of HPC project called: Mixed precision linear solvers for lattice QCD. Since I think that most people don’t know about the subject I will write this post to tell you

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Shaun Lahert

Shaun Lahert is a recent graduate of Theoretical Physics from Trinity College Dublin. He is spending this summer at the Cyprus Institute on PRACE’s Summer of HPC. Shaun will be working on Lattice QCD, in particular he will be examining

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Ambra Abdullahi Hassan

Ambra is a lovely, fun Italian girl of 24 years. Actually while her mom is Italian her dad comes from Somalia. Unfortunately she does not speak Somalian yet, nor has she been there — something she certainly wants to change in the future. Ambra

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A (hopefully) gentle introduction to lattice QCD

As I have mentioned in my previous blog posts, my Summer of HPC project is optimizing software for lattice quantum chromodaynamics computations. Since this probably doesn’t ring a bell for someone who has not studied physics, I will try to provide

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First Impressions of Nicosia

As a pleasant consequence of having a connecting flight in Munich, we flew over the Austrian Alps on the way to Cyprus. I was lucky enough to be sitting in a window seat. It was definitely something special to see

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Getting Started

Upon arrival on Saturday in Cyprus, Conor and I were greeted by blue sky, palm trees, and 36 degrees temperature. Thanks to our colleague, Stelios, who picked us up from the airport, we made it from Larnaka to Nicosia with

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Optimal deflation in the linear solver for lattice QCD

The student(s) will work in the Lattice QCD group of Prof. C. Alexandrou at CaSToRC in Cyprus.The task of the student will be to optimize deflation in the open source twisted mass code tmLQCD (https://github.com/etmc/tmLQCD) for the Blue Gene architecture.The student will write an interface so the eigenvectors produced using the tmLQCD code are written and reused for further computation. The student will investigate ways to optimise reading and writing (I/O) time, e.g. using compression or reduced precision.

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Hybrid CPU-GPU implementation of deflation in the linear solver for lattice QCD

The student will work in the Lattice QCD group of Prof. C. Alexandrou at CaSToRC in Cyprus. The task of the student will be to combine deflation in the open source twisted mass code tmLQCD (https://github.com/etmc/tmLQCD) with the solver component of QUDA (http://lattice.github.io/quda) for the hybrid machine Piz Daint in Switzerland.

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