Efficient Use of HPC Systems @GRNET

Common Room (GRNET headquarters)

Common Room

GRNET headquarters

7, Kifisias Av. 2nd Floor GR 115 23 Athens

Efficient Use of HPC Systems

11 - 12 December 2018


The purpose of this course  is to present to existing and potential users of PRACE HPC systems an introduction on how to efficiently use these systems,their typical tools, software environment, compilers, libraries, MPI/OpenMP, batch system, etc.

The trainees will learn what the HPC systems offer, how they work and how to apply for access to these infrastructures - both PRACE Tier-1 and Tier-0.


The course addresses to any potential user of an HPC infrastructure.  Background in modules, compilers, MPI/OpenMP/Cuda, batch systems, running time consuming applications is desirable.

Bring your own laptop in order to be able to participate in the training hands on. Hands on work will be done in pairs so if you don’t have a laptop you might work with a colleague.

Course language is English.


The maximum number of participants is 30.

Registrations will be evaluated on a first-come, first-served basis. GRNET is responsible for the selection of the participants on the basis of the training requirements and the technical skills of the candidates. GRNET will also seek to guarantee the maximum possible geographical coverage with the participation of candidates from many countries.


GRNET headquarters

Address: 2nd  Floor, 7, Kifisias Av. GR 115 23 Athens

Information on how to reach GRNET headquarters ia available on GRNET website: https://grnet.gr/en/contact-us/  

Accommodation options near GRNET can be found at: https://grnet.gr/wp-content/uploads/sites/13/2015/11/Hotels-near-GRNET-en.pdf

ARIS - System Information

ARIS is the name of the Greek supercomputer, deployed and operated by GRNET (Greek Research and Technology Network) in Athens. ARIS consists of 532 computational nodes seperated in four “islands” as listed here:

  • 426 thin nodes: Regular compute nodes without accelerator.

  • 44 gpu nodes: “2 x NVIDIA Tesla k40m” accelerated nodes.

  • 18 phi nodes: “2 x INTEL Xeon Phi 7120p” accelerated nodes.

  • 44 fat nodes: Fat compute nodes have larger number of cores and memory per core than a thin node.

All the nodes are connected via Infiniband network and share 2PB GPFS storage.The infrastructure also has an IBM TS3500 library of maximum storage capacity of about 6 PB. Access to the system is provided by two login nodes.

About Tutors

Dr. Dellis (Male) holds a B.Sc. in Chemistry (1990) and PhD in Computational Chemistry (1995) from the National and Kapodistrian University of Athens, Greece. He has extensive HPC and grid computing experience. He was using HPC systems in computational chemistry research projects on fz-juelich machines (2003-2005). He received an HPC-Europa grant on BSC (2009). In EGEE/EGI projects he acted as application support and VO software manager for SEE VO, grid sites administrator (HG-02, GR-06), NGI_GRNET support staff (2008-2014). In PRACE 1IP/2IP/3IP/4IP/5IP he was involved in benchmarking tasks either as group member or as BCO (2010-2018). Currently he is leader of the HPC team at GRNET S.A.

Kyriakos Ginis received his Diploma in Electrical and Computer Engineering in 2003 from the National Technical University of Athens, Greece. Between 2004 and 2014 he participated in the european projects EGEE I/II/III and EGI as a grid site administrator of the HellasGrid sites HG-01-GRNET, HG-06-EKT and HG-08-Okeanos. Since 2014 he works at GRNET as a system administrator of the ARIS HPC system, primarily responsible for hardware, operating systems and file/storage systems. He continues maintaining the HellasGrid sites HG-06 and HG-08, and supports other GRNET services such as the unique and persistent identifiers (PID)
service, also part of the EUDAT project.

Nikoloutsakos Nikolaos holds a diploma of Engineering in Computer Engineering and Informatics (2014) from the University of Patras, Greece. From 2015 he works as software engineer at GRNET S.A. where he is part of the user application support team for the ARIS HPC system. He has been involved in major national and European projects, such as PRACE and EUDAT. His main research interests include parallel programming models, co-processor programming using GPUs and Intel Xeon Phis.

Dr Aristeidis Sotiropoulos received his BSc in Computer Science in 1998 from the University of Crete, Greece and his PhD in Parallel Processing and Cluster Computing in 2004 from the National Technical University of Athens, Greece. His interests mainly focus on the fields of Large Scale Computing & Storage Systems, System Software for Scalable High Speed Interconnects for Computer Clusters and Advanced Microprocessor Architectures. He has published several scientific papers in international journals and conference proceedings. He has received the IEEE IPDPS 2001 best paper award for the paper "Minimizing Completion Time for Loop Tiling with Computation and Communication Overlapping". He has worked in several European and National R&D programs in the field of High Performance Computing, Grid Computing, Cloud Computing and Storage. In 2013, he was appointed as the Head of Operations and Financial Management Services, in charge of 15 people. Currently, he is managing EC projects at GRNET SA, the Greek NREN responsible for the provision of advanced e-infrastructure services to the Greek Academic and Research Community.


GRNET provides Internet connectivity, high-quality e-Infrastructures and advanced services to the Greek Educational, Academic and Research community.

Through its high-speed, high-capacity infrastructure that spans across the entire country, GRNET interconnects more than 150 institutions, including all universities and technological institutions, as well as many research institutes and the public Greek School Network.

GRNET operates the National High Performance Computing system (a Tier-1 in the European HPC ecosystem) and offers user and application support services, that provide Greek scientists with the computing infrastructure and expertise they need for their research enabling them to perform large scale simulations.

GRNET offers innovative IaaS cloud computing services to the Greek and global research & education communities: “ ~okeanos” and “okeanos global” allow users to create multi-layer virtual infrastructure and instantiate virtual computing machines, local networks to interconnect them, and a reliable storage space within seconds, with few, simple mouse clicks.

GRNET aims at contributing towards Greece’s Digital Convergence with the EU, by supporting the development and encouraging the use of e-Infrastructures and services. The right and timely planning strategies, together with the long experience and know-how of its people, guarantee the continuation and enhancement of GRNET’s successful course.

Greek Research and Technology Network – Networking Reserach and Education:

www.grnet.gr, hpc.grnet.gr

  • Tuesday, December 11
    • Introduction to PRACE
      Convener: Dr Aris Sotiropoulos (GRNET)
    • Access Policy
      Convener: Dr Dimitris Dellis (GRNET)
    • 12:15 PM
    • ARIS HPC System

      Architecture, Hardware, Interconnect, File-system, Login information

      Convener: Mr Kyriakos Gkinis (GRNET)
    • 1:30 PM
    • Environment Modules
      Convener: Mr Nikolaos Nikoloutsakos (GRNET)
    • Job Submission
      Convener: Dr Dimitris Dellis (GRNET)
    • Hands-On
  • Wednesday, December 12
    • Effective Libraries Use
      Convener: Dr Dimitris Dellis (GRNET)
    • Profiling
      Conveners: Dr Dimitris Dellis (GRNET), Mr Nikolaos Nikoloutsakos (GRNET)
    • 12:15 PM
    • Efficient Use of resources
      Convener: Dr Dimitris Dellis (GRNET)
    • 1:20 PM
    • Hands-On
    • Open Discussion - Panel
      Conveners: Dr Dimitris Dellis (GRNET), Kyriakos Gkinis (GRNET), Mr Nikolaos Nikoloutsakos (GRNET)