July 2013 - aktuell - lists.lrz.de

Betriebsunterbrechung beim Mailman-Dienst am Dienstag, 06.08.2013
by LRZ aktuell July 30, 2013

July 30, 2013

Der Mailinglistendienst des LRZ (lists.lrz.de) wird am kommenden Dienstag (06.08.2013) von 8:00 bis 9:00 Uhr auf eine neue Maschine migriert und steht deshalb waehrend dieses Zeitraums nicht zur Verfuegung. Mails, die in dieser Zeit an Mailinglisten verschickt werden, landen in einer Wartschlange und werden nach Ende des Umzugs bearbeitet. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/aktuell/ali4632/ Ado Haarer

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Course Introduction to OpenFOAM: Nov 4-7, 2013
by LRZ aktuell July 30, 2013

July 30, 2013

Date: November 4-7, 2013 9:00-18:00 Location: LRZ Building, Garching/Munich, Boltzmannstr. 1 This four-day course gives an introduction into the open source CFD toolbox OpenFOAM. It is intended for new users who want to learn the basic concepts of its usage and want to know how to modify existing applications or add new functionalities. Among others the course covers the topics * Introduction to working with Linux Users who are already proficient in Linux may join Contents: the course at lunch time at the first day * OpenFOAM file structure and case setup * Setting up and running simulations * Evaluating and visualizing results * Selection of numerical methods * Creating and converting meshes * Computing in parallel and acceleration on GPUs * Implementation of new features * Advanced topics in OpenFOAM Each day will be comprised of approximately 4 hours of lectures and 3 hours of hands-on sessions. General knowledge of CFD (finite volume method, Prerequisites discretization schemes etc.) is recommended. Programming skills in C++ are beneficial, but not essential for partaking in this course. Language: English Teachers: Bjoern Fabritius (FluiDyna GmbH) Academic users: a fee of 40 including the course material, a bootable USB stick with pre-installed Linux and OpenFOAM as well as catering for lunch and coffee breaks; to be paid during the course. Academic users register via the LRZ registration form (Please choose course HIOF1W13) Registration: Users from industry and non-academic users must contact FluiDyna GmbH (christoph.niedermeier(a)fluidyna.de) for registration and payment details. Number of seats for academic users is limited to 16. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4631/ Matthias Brehm

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SuperMUC: interruption of operation August 19-22
by LRZ aktuell July 30, 2013

July 30, 2013

Dear users of the SuperMUC petaflop system at LRZ, In the course of preparing the electrical infrastructure for the phase 2 installation, a power outage of at least 48 hours is needed. During this outage the system will naturally not be available for user operation. Therefore, batch processing will be stopped on August 19, 6:00. It is expected that general user operation will be resumed in the morning of August 22. There will be no changes to the software environment during this interruption of operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4630/ Reinhold Bader

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Upd:Netzbetrieb: Probleme am Internet-Zugang
by LRZ aktuell July 30, 2013

July 30, 2013

Aenderungen an der Mitteilung: Update Wir haben im Moment Probleme mit dem Internet-Zugangs-Router. Deswegen kommt es immer wieder zu Paketverlusten Richtung Internet. Wir hoffen die Probleme in einigen Minuten beseitigt zu haben. Die Probleme sind behoben. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4629/ Helmut Troebs

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Netzbetrieb: Probleme am Internet-Zugang
by LRZ aktuell July 30, 2013

July 30, 2013

Wir haben im Moment Probleme mit dem Internet-Zugangs-Router. Deswegen kommt es immer wieder zu Paketverlusten Richtung Internet. Wir hoffen die Probleme in einigen Minuten beseitigt zu haben. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4629/ Helmut Troebs

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Vorankuendigung: Ausfaelle des Internetzugangs am 6.8.
by LRZ aktuell July 29, 2013

July 29, 2013

Da weitgehend alle Nutzer im MWN betroffen sein koennen, sei heute bereits auf den Tausch des Routers csr1-2wr am Dienstag , den 6.8. hingewiesen. Zwischen 7:30 Uhr und 9:00 Uhr kann es dabei zum Ausfall des Internet- Zugangs kommen. Besonders gefaehrdet sind die Mitnutzernetze (z.B. BSB, BVB) sowie VPN- und Eduroam-Verbindungen. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4628/ Wolfgang Beyer

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Netzwartung am 30.7.
by LRZ aktuell July 29, 2013

July 29, 2013

1. Router-Tausch csr1-0gz Von 7:30 Uhr bis 9:00 Uhr wird der Router csr1-0gz im LMU-Stamgelaende gegen ein Geraet der Plattform Cisco Nexus C7010 ausgetauscht. Wir rechnen mit ca. je 10 Minuten Ausfall der angeschlossenen Leitungen. Neben den lokalen Anschluessen im LMU-Bereich sind die ueber M-net Glasfaser- und SDSL-Leitungen angebundenen Areale betroffen. Diese sind in der Uebersicht unter http://www.lrz.de/services/netz/mwn-ueberblick/stern.pdf grafisch dargestellt. 2. HSWT Weihenstephan Geb. 4379 (Zierpflanzenbau) Wegen eines defekten Luefters wird zwischen 8:00 Uhr und 8:30 Uhr der Switch swi1-kpf ausgetauscht. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4627/ Wolfgang Beyer

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Upd:SuperMUC: Integration of fat nodes completed
by LRZ aktuell July 26, 2013

July 26, 2013

Changes to this message: Fat nodes returned to user operation Update (July 26, 16:00): The fat node island has been returned to user operation. Please read http://www.lrz.de/services/compute/supermuc/ aktuell/ali4626/ for details on the changes before submitting jobs there. ----------------------------------------------------------------------- Update: SuperMUC's thin islands are back to normal operation. The fat island will follow next week. ----------------------------------------------------------------------- Update: The SuperMUC interruption has been prolonged from 2 to 3 days. ----------------------------------------------------------------------- Dear users of SuperMUC and the migration system supzero, we are now (with considerable delay) preparing to integrate the migration system supzero into the SuperMUC system. In order to complete the integration work, both SuperMUC and the migration system will require scheduled maintenance phases: 1. On July 16, 08:00, SuperMIG (supzero) will be shut down. Two weeks later, it will return as SuperMUC's fat-node island. During this period there will be no user operation on this part of the system. 2. From July 17, 08:00 to July 19, 18:00, SuperMUC will not be available for user operation, too. Please note that any LoadLeveler jobs on supzero that have not completed when the maintenance starts will be lost. After the maintenance, the fat node island will use the same Loadleveler instance, operating environment and GPFS file system as presently available on SuperMUC. Details on the changes in using the fat island as well as how to deal with the existing data on SCRATCH and WORK will be separately published; the system documentation will be accordingly updated. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4619/ Reinhold Bader

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SuperMUC: Changes in the usage of the fat node island
by LRZ aktuell July 25, 2013

July 25, 2013

Dear users of the fat node system at LRZ, earlier known as "SuperMIG", due to the integration of the fat node system into the SuperMUC infrastructure, there will be some items you will need to take care of before re-starting your job processing on this part of the system. 1. Login procedure: The name via which the login node is accessed has changed to supermuc-fat.lrz.de 2. Scratch and Project Data Handling: Instead of the previously used NAS volumes, the fat nodes are now provisioned with the same GPFS file system as the thin nodes. The NAS volumes will remain available in Read-Only mode until mid-November 2013. Please migrate any still needed data to GPFS by copying them to GPFS on a login node. For example: cd $SCRATCH cp -a $SCRATCH_MIGRATION/<dirname> <new_dirname> or cd $WORK cp -a $WORK_MIGRATION/<dirname> <new_dirname> It is probably a good idea for <new_dirname> to have the same value as <dirname> (if no name clashes occur). The paths pointed to by the variables SCRATCH_MIGRATION and WORK_MIGRATION will be available only on the login nodes. Also do not forget to adjust your batch scripts if you either have explicit path names in them, or if your directory structure has changed through the copying procedure. 3. LoadLeveler job classes and scripts: Because the same instance of LoadLeveler as for the thin nodes is now used, you will need to adjust the job class names for scripts that should run on the fat nodes: Please replace "general" by "fat" and "test" by "fattest". For jobs in the "special" class, please add the specification #@ requirements (Island == "island01") to force them to run on the fat node island. 4. Software updates: A new version of the operating system as well as the HPC software stack is now deployed. In particular, the MPICH2-based version of IBM MPI (PE 1.3) replaces the legacy 5.2 version. We consider it advisable to recompile all applications that previously were built for the fat nodes (see also next section). 5. Compilation procedure: Due to the different architecture of the thin and fat nodes, an executable that is compiled with defaults on the fat node does not take advantage of the AVX instructions on the thin nodes. Therefore we recommend to compile your code with "-axAVX -xSSE4.2" to target both types. This option tells the compiler to generate multiple, processor-specific auto-dispatch code paths for Intel processors. For details consult the following documents: + http://www.lrz.de/services/compute/supermuc/access_and_login/ + http://www.lrz.de/services/compute/supermuc/loadleveler/ + http://www.lrz.de/services/compute/supermuc/filesystems/ This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4626/ Reinhold Bader

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Serial cluster throughput increase
by LRZ aktuell July 25, 2013

July 25, 2013

A change in the scheduling policies has been introduced to increase the overall throughput. We slightly decreased the default setting for memory from 2000 MB to 1990 MB. This will help to schedule more jobs to a node, but should not affect users severely. Users who have previously submitted jobs do not need to change their pending jobs in the queue. Newly submitted jobs will automatically take advantage of the enhanced throughput. (Some users might want to cancel their pending jobs and resubmit them to take advantage of it) This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4625/ JuanPancorbo Armada

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