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Upd:Linux Cluster: Suspension of user operation Feb 25 - Mar 1
by LRZ aktuell Feb. 15, 2011

Feb. 15, 2011

Changes to this message: Corrected shutdown time As indicated in ALI 3942, an interruption of electrical power is scheduled for the weekend Feb 26-27. On the Linux cluster, additional maintenance measures will also be required. Therefore, the cluster will be unavailable for user operation between Friday, February 25, 16:00 and Tuesday, March 1, 18:00 All running batch jobs will be removed from the systems; we will leave the queues open until Friday 15:00, but recommend to set a user hold on any queued jobs which do not start execution in time to complete by Friday afternoon. Note: A job can be put into user hold by issuing the command qalter -h u <job id> Once the cluster has been returned to operation, you need to explicitly remove the hold again with qrls -h u <job id> This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3950/ Reinhold Bader

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TSM-Softwarewartung am 18.02.2011 von 10:00 bis ca. 11:00 Uhr
by LRZ aktuell Feb. 15, 2011

Feb. 15, 2011

Wegen einer kurzen Softwarewartung sind die Server S17, S27 und S13 am Freitag 18.02.2011 von ca. 10:00 bis ca. 11:00 Uhr nicht erreichbar. Wir bitten um Ihr Verstaendnis. Ihr ABS-Team Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/datenhaltung/adsm/aktuell/ali3954/ Monika Hufnagl

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Mailman-Wartung am Mittwoch, 16.02.2011 von 8 bis ca. 9 Uhr
by LRZ aktuell Feb. 15, 2011

Feb. 15, 2011

Der vom LRZ betriebene Mailinglistenserver wird am Mittwoch, 16.02.2011 wegen Wartungsarbeiten ab 8 Uhr fuer ca. eine Stunde ausser Betrieb genommen. Mails, die ueber diesen Server laufen (also Mails an ...@lists.lrz.de bzw. ...@lists.lrz-muenchen.de), werden daher erst mit entsprechender Verzoegerung zugestellt. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/aktuell/ali3953/ Ado Haarer

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HLRB-II: Suspension of user operation Feb 25 - Feb 27
by LRZ aktuell Feb. 14, 2011

Feb. 14, 2011

As indicated in ALI 3942, an interruption of electrical power is scheduled for the weekend Feb 26-27. Therefore, HLRB-II will be unavailable for user operation between Friday, February 25, 16:00 and February 27, afternoon All running batch jobs will be removed from the system; the queue for long-running (N64L) jobs will be closed on Tuesday, Feb. 22. For all other jobs, rerun will be performed at system start unless explicitly suppressed in the PBS request. Note that while we expect to return to operation during Sunday afternoon, this may be delayed if the infrastructure on which the system relies is not yet ready by then. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3952/ Reinhold Bader

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Netzwartung am 15.2.
by LRZ aktuell Feb. 14, 2011

Feb. 14, 2011

1. Zentrale Netzdienste Zwischen 7:00 Uhr und 7:30 Uhr werden die sogenannten Load Balancer im Rechenzentrumsnetz durch neue, leistungsfaehigere Geraete ersetzt. Fuer viele Dienste wie Radius (VPN, Eduroam), Mailversand, WWW-Server, Zugang zu Online-Medien und anderen wird es dabei zu einem Ausfall kommen. 2. TUM Maschinenwesen Gebaeudeteil 4 (WLAN) Wegen der Ersetzung eines Switches wird das WLAN im Gebaeudeteil 4 zwischen 8:00 Uhr und 9:00 Uhr zeitweise nicht zur Verfuegung stehen. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali3951/ Wolfgang Beyer

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Linux Cluster: Suspension of user operation Feb 25 - Mar 1
by LRZ aktuell Feb. 14, 2011

Feb. 14, 2011

As indicated in ALI 3942, an interruption of electrical power is scheduled for the weekend Feb 26-27. On the Linux cluster, additional maintenance measures will also be required. Therefore, the cluster will be unavailable for user operation between Friday, February 25, 17:00 and Tuesday, March 1, 18:00 All running batch jobs will be removed from the systems; we will leave the queues open until Friday 16:00, but recommend to set a user hold on any queued jobs which do not start execution in time to complete by Friday afternoon. Note: A job can be put into user hold by issuing the command qalter -h u <job id> Once the cluster has been returned to operation, you need to explicitly remove the hold again with qrls -h u <job id> This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3950/ Reinhold Bader

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Tutorial: Parallel Programming of High Performance Systems
by LRZ aktuell Feb. 11, 2011

Feb. 11, 2011

+----------------------------------------------------------------------+ | Date: |Monday, March 7 - Friday, March 11, 2011, 9:00-18:00 | |-------------+--------------------------------------------------------| | |LRZ Building, University campus Garching, near Munich. | | Location: | | | |RRZE building, University campus Erlangen, Martensstr.1 | | |(via video conference if there is sufficient interest) | |-------------+--------------------------------------------------------| | |This course, a collaboration of Erlangen Regional | | |Computing Centre (RRZE) and LRZ, is targeted at students| | |and scientists with interest in programming modern HPC | | |hardware, specifically the large scale parallel | | |computing systems available in Juelich, Stuttgart and | | |Munich. | | | | | |Each day is comprised of approximately 4 hours of | | |lectures and 3 hours of hands-on sessions. | | | | | |Day 1 | | | | | | * Introduction to High Performance Computing | | | * HPC systems at LRZ and in Germany | | | * Technical aspects of software engineering: | | | development process, usage of libraries, memory | | | management, tools for code documentation, | | | development environments | | | * Tools: Using Secure Shell, User interfaces, Source | | | code versioning systems and Make | | | | | |Day 2 | | | | | | * Basic parallel programming with MPI and OpenMP | | | * Processor Architectures: Register, Cache, Locality, | | Contents: | Performance metrics | | | | | |Day 3 | | | | | | * Principles of code optimization (unrolling, | | | blocking, dependencies, C++ issues, bandwidth | | | issues, performance projections) | | | * Using performance libraries | | | * Advanced MPI programming | | | | | |Day 4 | | | | | | * Parallel algorithms: data parallelism, domain | | | decomposition, task parallelism, master-worker, | | | granularity, load balancing, scalability models | | | * Advanced OpenMP programming | | | * Parallel Architectures: multi-core, multi-socket, | | | ccNUMA, cache coherence and affinity, tools for | | | handling memory affinity | | | | | |Day 5 | | | | | | * Architecture-specific optimization strategies: | | | compiler switches, avoiding cache thrashing, | | | exploiting SIMD capabilities | | | * MPI exercises | |-------------+--------------------------------------------------------| |Prerequisites|Good working knowledge of at least one of the standard | | |HPC languages: Fortran 95, C or C++. | |-------------+--------------------------------------------------------| | Language: |English | |-------------+--------------------------------------------------------| | Teachers: |G. Hager, Jan Treibig (RRZE), R. Bader, M. Mueller (LRZ)| |-------------+--------------------------------------------------------| |Registration:|Via the LRZ registration form (choose course HPPP1W10) | +----------------------------------------------------------------------+ Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/compute/aktuell/ali3949/ Matthias Brehm

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Upd:Update: HLRB-II back in production
by LRZ aktuell Feb. 9, 2011

Feb. 9, 2011

Changes to this message: Back in production Dear users of HLRB-II, update: the problems on HLRB-II have been fixed and the system is back in production. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3948/ Hans-Georg Kleinhenz

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HLRB-II down
by LRZ aktuell Feb. 9, 2011

Feb. 9, 2011

Dear users of HLRB-II, we currently experience severe problems on HLRB-II with several partitions down or hanging; there are also problems accessing the cxfs filesystems ($PROJECT, $OPT_TMP) from the login partition. To access your data and to submit jobs please use the alternate login node login2.hlrb2.lrz-muenchen.de We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3948/ Hans-Georg Kleinhenz

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Upd:Update: HLRB-II login partition back in production
by LRZ aktuell Feb. 7, 2011

Feb. 7, 2011

Changes to this message: a01 back in production Dear users of HLRB-II, the problems on the login partition of HLRB-II have been fixed and it is back in production. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali3945/ Hans-Georg Kleinhenz

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