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Netzwartung am 30.4.
by LRZ aktuell April 29, 2013

April 29, 2013

Zwischen 07:30 Uhr und 09:00 Uhr wird ein neuer zentraler Switch in die Rechenzentrums-Netzstruktur (Spanning Tree-Verbund) integriert. Dabei kann es (muss aber nicht) fuer die am LRZ erbrachten Dienste (Radius, E-Mail, WWW, Speicherdienste, Zugang zu Onlinemedien usw.) zu kurzzeitigen (ca. 30 Sekunden langen) Unterbrechungen kommen. Am kommenden Dienstag (7.5.) werden die Switches an denen die Server angeschlossen sind auf den neuen Zentralswitch umgehaengt. Dabei kann es wieder zu Stoerungen kommen. Der Internet-Zugang ist von diesen Arbeiten nicht betroffen. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4570/ Wolfgang Beyer

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Upd:Lecture Prof. Michael Flynn 'Dataflow Engines in High Performance Computing'
by LRZ aktuell April 25, 2013

April 25, 2013

Changes to this message: Update Lecture Michael Flynn: Dataflow Engines in High Performance Computing Friday, May 3rd, 2013, 10 am LRZ Hoersaal H.E.009 Abstract: Achieving parallel processor speedup (n times speedup with n processing elements) has been difficult for a broad class of applications. The problem is not technology but programming models. One answer to this speedup problem is to create an idealized data flow machine that exactly corresponds to the application and stream data through the resulting machine. In the dataflow paradigm an application is considered as a dataflow graph of the executable actions.. The extraordinary density achieved by FPGAs allows emulations of the application dataflow machine, providing more than an order of magnitude speedup even as executed as an emulation of the data flow machine. Michael Flynn received his Ph.D. from Purdue University in 1961. He joined IBM in 1955 and for ten years worked in the areas of computer organization and design. He was design manager of prototype versions of the IBM 7090 and 7094/II, and later for the System 360 Model 91 Central Processing Unit. Between 1966 and 1974 Prof. Flynn was a faculty member of Northwestern University and the Johns Hopkins University. In 1975 he became Professor of Electrical Engineering at Stanford University, and was Director of the Computer Systems Laboratory from 1977 to 1983. He was founding chairman of both the ACM Special Interest Group on Computer Architecture and the IEEE Computer Society's Technical Committee on Computer Architecture. Prof. Flynn was the 1992 recipient of the ACM/IEEE Eckert-Mauchley Award for his technical contributions to computer and digital systems architecture. He was the 1995 recipient of the IEEE-CS Harry Goode Memorial Award in recognition of his outstanding contribution to the design and classification of computer architecture. In 1998 he received the Tesla Medal from the International Tesla Society (Belgrade), and an honorary Doctor of Science from Trinity College (University of Dublin), Ireland. He is the author of three books and over 250 technical papers. This information is also available on our web server http://www.lrz-muenchen.de/aktuell/ali4569/ Ludger Palm

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Lecture Prof. Michael Flynn 'Dataflow Engines in High Performance Computing'
by LRZ aktuell April 25, 2013

April 25, 2013

Lecture Michael Flynn: Dataflow Engines in High Performance Computing Friday, May 3rd, 2013 LRZ Hoersaal H.E.009 Abstract: Achieving parallel processor speedup (n times speedup with n processing elements) has been difficult for a broad class of applications. The problem is not technology but programming models. One answer to this speedup problem is to create an idealized data flow machine that exactly corresponds to the application and stream data through the resulting machine. In the dataflow paradigm an application is considered as a dataflow graph of the executable actions.. The extraordinary density achieved by FPGAs allows emulations of the application dataflow machine, providing more than an order of magnitude speedup even as executed as an emulation of the data flow machine. Michael Flynn received his Ph.D. from Purdue University in 1961. He joined IBM in 1955 and for ten years worked in the areas of computer organization and design. He was design manager of prototype versions of the IBM 7090 and 7094/II, and later for the System 360 Model 91 Central Processing Unit. Between 1966 and 1974 Prof. Flynn was a faculty member of Northwestern University and the Johns Hopkins University. In 1975 he became Professor of Electrical Engineering at Stanford University, and was Director of the Computer Systems Laboratory from 1977 to 1983. He was founding chairman of both the ACM Special Interest Group on Computer Architecture and the IEEE Computer Society's Technical Committee on Computer Architecture. Prof. Flynn was the 1992 recipient of the ACM/IEEE Eckert-Mauchley Award for his technical contributions to computer and digital systems architecture. He was the 1995 recipient of the IEEE-CS Harry Goode Memorial Award in recognition of his outstanding contribution to the design and classification of computer architecture. In 1998 he received the Tesla Medal from the International Tesla Society (Belgrade), and an honorary Doctor of Science from Trinity College (University of Dublin), Ireland. He is the author of three books and over 250 technical papers. This information is also available on our web server http://www.lrz-muenchen.de/aktuell/ali4569/ Ludger Palm

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Upd:SuperMUC: Returned to user operation
by LRZ aktuell April 24, 2013

April 24, 2013

Changes to this message: Returned to user operation Dear users of the SuperMUC Petaflop system, The scheduled maintenance has been completed, and the system has been returned to user operation. Login to the machine is expected to be possible at ca. 17:30 on April 24. The changes to the system are as follows: * Updated operating environment (SLES11SP2). Please consult the release notes by SuSE/Novell at https://www.suse.com/releasenotes/ x86_64/SUSE-SLES/11-SP2/for details. In particular, we expect that the Transparent Huge Pages support should give a performance improvement for many applications. Please provide feedback if you happen to observe the opposite effect for yours! Also, some applications may require significantly more memory, so again please report to us if an application fails with allocation errors that used to run fine before. * Bug fix update for the MKL libraries * Bug fix and minor feature update of the (non-default) Intel compiler version 13.1 * Bug fix update for Intel MPI 4.1 (MPI_Abort() now should really terminate the complete job). However, Intel MPI 4.0 (and earlier) should not be used under this new environment any more. Please note that we expect existing binaries to still run correctly in the new environment. Should this not be the case, please recompile your executable and resubmit your job(s) before opening an incident at our service desk. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4557/ Reinhold Bader

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Upd:TSM Kernel- und Firmware Updates am 22.04.2013 Beendet
by LRZ aktuell April 22, 2013

April 22, 2013

Aenderungen an der Mitteilung: Update Update 22.04.2013 16:00 Uhr: Die Wartung ist beendet. Alle Systeme sollten nun wieder verfuegbar sein. Um Ihnen auch in Zukunft die gewohnte Servicequalitaet zur Verfuegung stellen zu koennen, fuehren wir am Montag, den 22.04.2013 von 7:00 bis ca. 17:00 Uhr eine Hard- und Softwarewartung an unserem Archiv- und Backupsystem durch. Im Zuge dieser Wartung kann es Beeintraechtigungen bei den Tapemounts und bei der Verfuegbarkeit der Server geben. Wir bitten um Ihr Verstaendnis, falls es zu Unannehmlichkeiten auf Ihrer Seite kommen sollte. In order to be able to keep delivering the familiar service quality for you we perform a hard- and software maintenance on our Archive and Backup System on Monday, 2013-04-22 from 7:00 am to 17:00. We apologize for any inconvenience on your side. Note: SuperMIG/MUC Archive Nodes, HLRB2 Archive Nodes, Grid as well as Linux-Cluster users are affected too. Ihr ABS-Team Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/datenhaltung/adsm/aktuell/ali4554/ Monika Hufnagl

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Upd:SuperMIG: Returned to user operation
by LRZ aktuell April 22, 2013

April 22, 2013

Changes to this message: Update Dear users of the SuperMIG migration system at LRZ, The system has been returned to user operation. The cause for the system crash was a software problem that only occurs very rarely. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4566/ Reinhold Bader

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Upd:Netzwartung am 23.04.2013
by LRZ aktuell April 22, 2013

April 22, 2013

Aenderungen an der Mitteilung: Ergaenzungen Zwischen 07:30 Uhr und 09:00 Uhr erfolgt an den zentralen Rechenzentrumsswitches ein Software-Update. Dabei kann es (muss aber nicht) fuer alle am LRZ erbrachten Dienste (Radius, E-Mail, WWW, Speicherdienste usw.) mehrfach zu kurzzeitigen (ca. 30 Sekunden langen) Unterbrechungen kommen. Der Internet-Zugang ist von diesen Arbeiten nicht betroffen. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4558/ Helmut Troebs

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European Trilinos User Group meeting (EuroTUG)
by LRZ aktuell April 22, 2013

April 22, 2013

On behalf of the organizers and the host institutions, Technische Universitaet Muenchen (TUM) & Leibniz Rechenzentrum (LRZ), we would like to invite you to the 2nd European Trilinos User Group meeting (EuroTUG). The meeting will be held in Munich, Germany, on June 3-5, 2013. Details and registration are available at the following link: http://www.lnm.mw.tum.de/mhpc/european-trilinos-user-group-meeting/ The EuroTUG is a satellite to the TUG meeting held annually at Sandia National Laboratories, Albuquerque, USA. EuroTUG brings together and facilitates communication between Trilinos users, clients and developers from all over Europe and provides an insight and outlook in current trends in development of Trilinos as well as to current trends in HPC in general. We encourage participants to indicate their specific interests during the registration process to allow the organizers to define focus points. Also, participants are encouraged to present their individual research/work that involves utilization or development of packages from Trilinos. Please be aware that you have to book your hotel before April 30th to benefit from the EuroTUG special hotel rates. Make sure to book your hotel room as soon as you can, since hotels in Munich will be fully booked in beginning of June due to other events. Also, our limited contingent of reserved rooms is filling quickly. Best Regards on behalf of all organizers, * Peter Arbenz, ETHZ * Arndt Bode, LRZ * Simone Deparis, EPFL * Gilles Fourestey, CSCS * Michael Gee, TUM * Mike Heroux, Sandia Nat'l Laboratories This information is also available on our web server http://www.lrz-muenchen.de/aktuell/ali4567/ Ludger Palm

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SuperMIG: Temporarily unavailable due to system crash
by LRZ aktuell April 22, 2013

April 22, 2013

Dear users of the SuperMIG migration system at LRZ, due to a system crash that occurred during the weekend the migration system is presently unavailable. We'll notify you via this document about the status of the system. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4566/ Reinhold Bader

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DDoS Angriffe mit Beteiligung von Systemen aus dem Muenchner Wissenschaftsnetz
by LRZ aktuell April 19, 2013

April 19, 2013

Das LRZ beobachtet derzeit vermehrt Denial of Service (DoS und DDoS) Angriffe unter Beteiligung von Systemen aus dem Muenchner Wissenschaftsnetz (MWN). Die Angreifer senden dabei (sehr kleine) Pakete mit SNMP-Anfragen, einem geratenen Passwort und einer gefaelschten Absenderadresse (die Adresse des Opfers) an Systeme im MWN, die dann mit sehr grossen Paketen an das Opfer antworten. Durch den sehr hohen Verstaerkungsfaktor wird das Opfer sehr schnell mit sehr grossen Verkehrsvolumina geflutet. Das LRZ hat diesbezueglich auch schon externe Beschwerden von Opfern bekommen. Haeufig sind bei diesen Angriffen Netzwerkdrucker beteiligt, bei denen im Auslieferungszustand SNMP aktiviert und als Passwort "public" (vor-) eingestellt ist. Wir diskutieren derzeit den SNMP-Zugang aus dem Internet (am X-WiN Uebergang) zu sperren, um diese Angriffe zu beschraenken und moechten Sie schon einmal vorab informieren. Sollte es weitere Angriffe geben, wuerden wir ggf. die Sperre auch am Wochenende aktivieren. Wir koennen natuerlich bei einer benoetigten und begruendeten Nutzung des SNMP-Protokolls auch von ausserhalb des MWN bestimmte Adressen von diesen Sperren ausnehmen. Dies setzt natuerlich voraus, dass ein sicheres SNMP-Passwort verwendet wird. Entsprechende Bedarfe muessten Sie uns dann mitteilen. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4565/ Helmut Reiser

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