Die letzten Meldungen

Behoben: Störung beim E-Mail Dienst Exchange

26. Mai 2017

Die Störung des Exchange-Dienstes wurde am 26.5.2017 um 10:45 behoben.

(behoben) Störung der Glasfaserverbindung Verwaltungsnetz zwischen Halbmondstraße und RRZE

22. Mai 2017

Aufgrund einer Störung an der Glasfaserverbindung des Verwaltungsnetzes (ZUV) zwischen dem Aufpunkt Halbmondstr. und dem RRZE können die Verwaltungsarbeitsplätze im Schloss, der Halbmondstr. sowie Krankenhaus- und Turnstr. gegenwärtig keine der zentralen Dienste oder das Internet erreichen.

Downtime of HPC clusters LiMa, TinyFAT & parts of Woody on Mon, May 15 (FINISHED)

12. Mai 2017

Due to urgent work on the power grid, the HPC clusters LiMa, TinyFAT & parts of Woody (w10xx = :sb and w12xx = :sl16) as well as Memoryhog have to be shut down on Monday, May 15th starting at 7 o’clock in the morning. As usual, jobs that would collide with the downtime will be postponed.

Meldungen nach Thema


NUMA Optimizations

General Remarks

This project aims at developing programming and optimization strategies to improve data placement on shared memory computers with non-uniform data access characteristics. This includes ccNUMA systems, but also multi-core processors that often have a complex hierarchical cache structure.

C++ programming techniques for High Performance Computing on systems with non-uniform memory access using OpenMP

Diploma thesis at the Externer Link:  Georg Simon Ohm University of Applied Sciences Nuremberg.

Author: Holger Stengel (now RRZE)

Supervisor: Georg Hager (HPC Services).

Abstract: This work develops programming methodologies for C++ that respect the need for optimal NUMA page placement in OpenMP code. An overloaded new[] operator is presented that guarantees proper placement for arrays of objects. Along the same lines, the STL vector<> class can be endowed with an allocator class argument that serves the same purpose. The disadvantages of std::vector<> in terms of performance and usability in a NUMA setting are circumvented by developing a special numa_vector<> container which is compatible with all STL algorithms. Finally, a container with a segmented, padded data structure, including appropriate iterators, allows one to make generic algorithms aware of data segmentation of any kind (including NUMA) without sacrificing performance.

Downloads: PDF: Poster (English), PDF: Thesis (in German).


Project manager:

  • Dr. Georg Hager
    Regionales Rechenzentrum Erlangen
    HPC Services
    Martensstr. 1
    91058 Erlangen
    +49 (0)9131 85 28973

Letzte Änderung: 13. Maerz 2012, Historie

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