Platforms at HLRS, Usage and Programming

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Platforms at HLRS, Usage and Programming


The course will focus on the major platforms at HLRS:

  • Cray XE6 (preliminary system for the next petascale system)
  • NEC LX-2400 (Nehalem Cluster, 62 TFlop/s, 5600 cores)
  • IBM bwGrid Cluster (46 TFlop/s)
  • NEC SX-9 (19 TFlop/s, 192 vector processor cores)
  • Cray XT5m (8.5 TFlop/s, 892 cores)
  • CUSS (Common Ulm Stuttgart Server)

The course has two days.

  • The first day gives an overview on all platforms of HLRS.
  • The second day is dedicated to the new Cray XE6 platform.

Seperate registration of individual days is possible. Especially, if one is interested only in the new and upcoming Cray XE6 petascale installation at HLRS, all necessary information is presented on the second day.

General Information


Monday, April 18, 2011

Overview on HLRS Platforms -- Access, Usage and Programming

9:00 Introduction (R. Rabenseifner, HLRS)
9:15 HPC Infrastructure Evolution at HLRS (M. Resch, HLRS)
9:45 Platforms at HLRS (M. Hecht, HLRS)
              Hardware overview on
              Cray XE6, NEC SX-9, Nehalem-Cluster, bwGRID Cluster, Cray XT5
10:15 Coffee
10:30 Access to the Platforms at HLRS (Th. Bönisch, HLRS)
10:45 Cray XE6 and XT5m - Usage and Programming (Chr. Niethammer, HLRS)
              (a short overview)
11:30 Preparation for grid usage on bwGrid resources (talk) (M. Hecht, HLRS)
              (includes remarks on gsissh)
12:00 Coffee
12:15 bwGrid - Usage and Programming (M. Hecht, HLRS)
              (includes also remarks on visualization nodes)
13:00 Lunch
14:00 NEC Nehalem Cluster - Usage and Programming (H. Berger, NEC)
              (includes also remarks on NVIDIA/Tesla)
14:45 Coffee
15:00 NEC SX-9 at HLRS - Usage and Programming (St. Haberhauer, NEC)
15:30 Filesystems and HPSS at HLRS (Th. Bönisch, HLRS)
16:00 Coffee
16:20 ISV-Codes and Licenses at HLRS (M. Bernreuther, HLRS)
17:00 Guided tour (HLRS)
18:15 End

Tuesday, April 19, 2011

Cray XE6 Optimization Workshop (S. Andersson, Cray)

9:00 Cray XE6 Architecture
              Architecture of Cray XE6
              Socket 34 architecture
              Gemini Interconnect
9:40 The CRAY Programming Environment - Part I
              Compiler options and flags
10:30 Coffee
10:45 The CRAY Programming Environment - Part II
              Aprun options
              Batch jobs - How to use the HLRS XE6
11:45 Coffee
12:00 Optimization I
              Optimization methodology
              Using Craypat to profile applications
12:45 Lunch
13:45 Optimization II
              Scaling applications to thousands of processors
              MPI optimization
              Task placement
15:15 Coffee
15:30 Optimization III
              Memory understanding and optimization
              Cache blocking examples
16:00 Coffee
16:15 Optimization IV: I/O
              Lustre basics
              MPI-IO Environment variables
              MPI-IO Example
17:30 End




Thomas Beisel, Katharina Benkert, Jochen Buchholz, Thomas Boenisch, Christoph Niethammer, Martin Bernreuther, Martin Hecht from HLRS, and TBA from Cray and NEC


via online registration form


for registration is Apr. 03, 2011 (extended deadline)


Members of German universities and public research institutes: none,
others: 150 EUR (includes food and drink at coffee breaks, will be collected on the first day of the course, cash only)


Programming experience, and partially MPI-1

Travel-Info Stuttgart

See HLRS address and travel-info. The next public transport stations are: "Universität, Stuttgart" (S-Bahn station, 15 min on foot) and "Lauchhau, Stuttgart" (Bus station, 4 min on foot to HLRS, bus lines 84, 92, 746, 747, 748, but not 82! from S-Bahn station "Universität, Stuttgart" and bus line 81 from S-Bahn station "Stuttgart-Vaihingen").
Accomodation: see HLRS accomodation-info. Private Bed&Breakfast is also available (might be cheaper than the hotels), e.g., A DJH youth hostel is also available.
Further links: Online-Stadtplan des Stadtmessungsamtes Stuttgart or


Rolf Rabenseifner
phone 0711 685 65530