Goodbye Copenhagen, A Shakespearean Epilogue

It’s been a while in since the project started in Copenhagen, and it is perhaps a good time to summarize the adventure so far. Spending almost two month in Copenhagen, Denmark, is enough time to get a good impression of

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Cluster Scale GPGPU with OpenCL

Previous posts about climate modeling and CESM were required as this post is the crème de la crème of CESM from my point of view. Cluster scale GPGPU seems to be very nice, on paper, but as soon as we

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CESM – Modeling Earth Future Climate

CESM - High Level Component Diagram

Following the previous post, it is clear why climate modeling is performed using computers. The amount of data and computational needs of climate simulations can be significant, so supercomputers are extensively used to perform the task. In fact, THE strongest

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Make runtime of your app and life shorter, vectorize!

Vectorization is a first step in optimization process to produce high performance algorithms. Moti and I contended with vectorization for a few days. As mentioned in one of our previous posts, we decided to implement SIMD vectorization using Intel SSE/AVX

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2nd Copenhagen Quiz

It is now time for the 2nd and last quiz from Copenhagen, dedicated to our final project. If you recall our previous post about climate modeling, it introduced some figures of observed climate data. A precise definition of Albedo can

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The Butterfly Effect, Chaos and Climate Modeling

Ever wondered what is the connection between the Butterfly effect, Chaos and Supercomputers? One of the the best ways to describe it can be using climate modeling. Geophysics and Climate Modeling Geophysics is a field in exact sciences that tries to

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MPI – Notes from Training Week

Synchronous and asynchronous communication in MPI Here is a very nice video from our first training week in EPCC, Edinburgh. Dr. David Henty describes message passing as an introduction to MPI concepts and the difference between synchronous and asynchronous communication.

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When FORTRAN met OpenCL – A Love Story? (of Integration)

Both of the projects Lukas and I are working on, here at NBI Copenhagen, are based on FORTRAN. Either Photon-Plasma simulations or CESM for climate modeling (as most climate modeling software around). Certainly, a vast majority of scientific code is

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A Week Full of Surprises

Man at Work We arrived at the first day, after a long and peaceful weekend. Lukas went to the beach, but concluded it was too small for him. There are more to look after. Days in Copenhagen can be tricky,

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Quiz – clustered data using k-means

Moti and I work on the k-means clustering project, you can read our first post about it. Now we prepared a short and easy quizz related with k-means topic for you. When you cluster dataset using classic k-means algorithm you

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First week in Copenhagen

First Meeting and Introduction When Moti and I  met in front of the main building of Niels Bohr Institute (NBI), it was no more than 17 hours since we arrived to Copenhagen. A joint breakfast was waiting for us together

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SoHPC – The Week so far: Pollock Halls & OpenMP

Image of the group having a picnic in Pollock Halls, Edinburgh

The Summer of HPC Training week began on Sunday. Those of us more experienced in the kind of weather that can usually be expected in Edinburgh were pleasantly surprised when we arrived on Saturday. Those who hail from sunnier climes

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