HPC

Can one of our MSc students help you?

Author: Mario Antonioletti
Posted: 31 Aug 2016 | 15:29

We're looking for collaborative projects with industry and academia.

A new batch of students will soon be joining our MSc in High Performance Computing (HPC) and MSc in HPC with Data Science.

As ever we are on the look-out for interesting collaborative projects for the students to undertake towards the end of their course (roughly from April/May to August). 

MPI performance on KNL

Author: Adrian Jackson
Posted: 30 Aug 2016 | 12:22

Knights Landing MPI performance

Following on from our recent post on early experiences with KNL performance, we have been looking at MPI performance on Intel's latest many-core processor.

MPI ping-pong latency on KNC and IvyBridge
Figure 1

The MPI performance on the first generation of Xeon Phi processor (KNC) was one of the reasons that some of the applications we ported to KNC had poor performance.  Figures 1 and 2 show the latency and bandwidth of an MPI ping-pong benchmark running on a single KNC and on a 2x8-core IvyBridge node.

Early experiences with KNL

Author: Adrian Jackson
Posted: 29 Jul 2016 | 16:45

Initial experiences on early KNL

Updated 1st August 2016 to add a sentence describing the MPI configurations of the benchmarks run.
Updated 30th August 2016 to add CASTEP performance numbers on Broadwell with some discussion

EPCC was lucky enough to be allowed access to Intel's early KNL (Knights Landing, Intel's new Xeon Phi processor) cluster, through our IPCC project.  KNL Processor Die

KNL is a many-core processor, successor to the KNC, that has up to 72 cores, each of which can run 4 threads, and 16 GB of high bandwidth memory stacked directly on to the chip.

Latest Top500 list, looking beyond the number 1

Author: Adrian Jackson
Posted: 21 Jun 2016 | 17:13

There's been a lot of discussion about the latest Top500 list, released this week at ISC16.  Most of the interest has been in the whopping new Chinese system, Sunway TaihuLight, which has come in at number 1 on the list with a massive 93 PFlop/s rpeak Linpack performance, and 125 PFlop/s rmax theoretical peak performance (3 times bigger than the previous number 1 system).Top500

Whilst this is a very interesting system, and much bigger than is currently planned elsewhere, it's not unknown for very large systems to come in and dominate the list like this.  Back in 2002, the Japanese Earth Simulator system became the number 1 machine with an rpeak of ~5x that of the previous number 1 system, and it stayed as the top machine for a number of years.

Collaboration, collaboration, collaboration

Author: Adrian Jackson
Posted: 15 Jun 2016 | 13:35

This week sees our annual collaboration workshop with Tsukuba University, Japan (more details are available here).  This is a great chance to get a flavour of the kind of research another HPC centre is undertaking, how they work, and what platforms they are investing in.

The Centre for Computational Sciences (CCS) at Tsukuba is a department very like EPCC, in that it is responsible for high performance and parallel computing at the university, runs and supports large-scale computers for researchers, and undertakes parallel computing research.

Fortissimo Marketplace: a one-stop-shop for modelling and simulation services

Author: Mark Sawyer
Posted: 3 Jun 2016 | 14:34

 

A consortium of Europe’s leading supercomputing centres and HPC experts is developing the Fortissimo Marketplace, a one-stop-shop where end-users will access modelling and simulation services, plus high-performance data analytics.

Better programming languages for HPC

Author: Stephen Booth
Posted: 5 May 2016 | 16:43

Recently I seem to have had many conversations about programming languages for HPC. In some ways this is not a new subject - I have been having similar conversations for the last 20 years. However as HPC hardware evolves, machines become more complex and the issues that need to be addressed by programmers also become more complex. So it is not surprising that we are wondering if there is more the compiler could be doing to help us.

Intel compiler on ARCHER

Author: Adrian Jackson
Posted: 26 Apr 2016 | 13:07

Bug

I had a recent query from some users with a problem with the default version of the Intel Fortran compiler on ARCHER (v15.0.2.164).  It was a nice query to get because the users had done all the work already; they'd identified the problem, found a test code that demonstrated it, and told me what the solution would be for them.

Fortunately, the solution was easy, this bug has been fixed in a newer version of the compiler (16.0.2.181), which is installed and available on ARCHER, but just isn't the default (we tend to keep the default version slightly behind the latest release but as new as possible), so they simply have to swap the compiler modules then their code can compile and run correctly.

How using HPC can help businesses compete in today’s world

Author: Mark Parsons
Posted: 22 Apr 2016 | 14:22

Through funded experiments, Fortissimo helps SMEs take advantage of business benefits enabled through HPC technologies. Visit our stand in Hannover Messe to see the world’s first production ‘megacar’ designed and built by the Swedish SME, Koenigsegg.

HPC hardware in 2016 and beyond

Author: Adrian Jackson
Posted: 19 Apr 2016 | 23:14

Anyone taking more than a passing interest in HPC hardware recently will have noticed that there are a number of reasonably significant trends coming to fruition in 2016. Of particular interest to me are on-package memory, integrated functionality, and new processor competitors.  Intel Xeon Phi (KNL) Die

On-package memory, memory that is directly attached to the processor, has been promised for a number of years now. The first product of this type I can remember was Micron's Hybrid Memory Cube around 2010/2011, but it's taken a few years for the hardware to become mature enough (or technically feasible and cheap enough) to make it to mass market chips. We now have it in the form of MCDRAM for Intel's upcoming Xeon Phi processor (Knights Landing), and as HBM2 on Nvidia's recently announced P100 GPU.

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