ct-grid October 2010

ct-grid@nikhef.nl

2 participants
4 discussions

[Ct-grid] terena certificates
by Tom Visser 04 Feb '11

04 Feb '11

Hi, Based on comments in a recent ct grid meeting i've been playing around with the terena certificates. This nice service enables members of accredited organisations to apply for a certificate while using their home instutions credential to identify themselves. I have requested a certificate en succesfully became a member of a VO. Be carefull: Changing your certificate dn would mean you will have problems accessing your previous data. https://tcs-escience-portal.terena.org/about_nren.php I have one question: are these fully qualified certificates for grid use, or are their any differences? Are their any issues we would have to reckon with? Does anybody have experiences with job-submission using a terena certificate? Thanks for your thoughts, Tom Available identity providers NIKHEF SARA SURFNET TERENA TUDELFT Universiteit Tilburg Vrije universiteit Tom Visser Phone: +31617411603 Mail: tom.visser(a)sara.nl SARA Computing & Networking Services High Performance Computing and Visualization http://www.sara.nl

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[Ct-grid] PPT, EGI InSPIRE en EMI (Nikhef urenschrijvers)
by Arjen van Rijn 02 Nov '10

02 Nov '10

Beste allen, Een aantal van jullie heeft (automatisch) bericht gekregen uit het PPT-systeem, met het verzoek om je uren over de maanden mei en juni daarin te gaan bijhouden. Ik wil met zowel de projectleiding van EMI als van EGI-InSPIRE gaan afspreken, dat Nikhef de urenverantwoording levert vanuit haar eigen systeem - zoals we dat ook in het EGEE-tijdperk hebben gedaan. Ik heb daar nog geen overeenstemming over, maar ik heb goede hoop, dat dat zal lukken. Voor nu mag je dus deze reminders even negeren. Stay tuned! Groet, Arjen

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[Ct-grid] GPU computing seminar - 17 november
by Jan Just Keijser 26 Oct '10

26 Oct '10

From: cwi-all-bounce(a)cwi.nl [mailto:cwi-all-bounce@cwi.nl] On Behalf Of Joost Batenburg Sent: maandag 18 oktober 2010 15:39 To: cwi-all(a)cwi.nl Subject: [cwi-all] GPU computing seminar - 17 november What: CWI GPU computing seminar When: Wednesday, 17 November Where: CWI, room TBA Dear colleagues, You are all invited to join the first CWI GPU computing seminar on Wednesday, 17 November. A description of the topic and the program can be found below. If you are interested in participating, please register before 3 November by sending an email to Paul de Zeeuw (Paul.de.Zeeuw(a)cwi.nl), so we can estimate the number of participants. With best regards, Joost Batenburg Paul de Zeeuw =================================================== CWI Seminar: GPU computing Within a PC, the Graphics Processing Unit, or GPU, is responsible for 2D and 3D visualization tasks. Stimulated by the 3D gaming industry, GPUs have evolved over the years into powerful parallel processors. GPU computing refers to the use of a GPU for general purpose computing. In recent years, the GPU has become fully programmable to the point where it can now be utilized for a wide range of computations, and in particular for scientific computing. However, the programming model exposed by a GPU is not as general as the sequential CPU model and implementing algorithms on the GPU is a delicate task. Nevertheless, for suitable applications, using a GPU instead of a CPU can result in impressive speedups of 25 or more. This seminar aims to serve as an introduction to the emerging field of GPU computing and provide a global overview of the GPU architecture. A range of programming models will be covered, ranging from transparent use of the GPU through Matlab, to direct low-level programming of the GPU. No background knowledge on GPUs will be assumed. After this introductory seminar, one or more additional meetings will be planned that will be focused on particular scientific problems that can benefit from GPU computing. Program: 13:30 - 14:15 Introduction GPU computing Joost Batenburg 14:15 - 14:45 Transparent GPU computing through Matlab (Jacket) Paul de Zeeuw 14:45 - 15:00 Coffee Break 15:00 - 15:30 Automatic parallellization of program code using the Portland Group Accelerator Joke Blom 15:30 - 16:00 Direct GPU programming with CUDA Willem Jan Palenstijn (University of Antwerp) 16:00 - 16:15 Starting with GPUs: availability and practical considerations Joost Batenburg 16:15 - Drinks and informal discussion

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[Ct-grid] Presentation on middleware independent job submission
by Oscar Koeroo 08 Oct '10

08 Oct '10

Hello *, I'd like to invite you to the presentation of Tünde Bálint about middleware independent job submission. Her master thesis is sourced from the job submission limitations of workflow engine WS-VLAM, which is currently limited to DAS3 and LCG-CE Grid Sites. Key words: WS-VLAM, SAGA, MW independent job submission Location: Nikhef building, room N041 (see below for route) Time: Tuesday, October 12, 11:00 am Abstract: Modern science and engineering are increasingly done in a collaborative fashion. These collaborations are multi-institutional, multi-disciplinary and geographically distributed environments. The Grid is the collection of physical and logical resources such as computing and storage facilities, file systems and high performance networks to which shared access is mediated by grid protocols. A number of middleware implementations have been proposed and implemented that interface the user applications executing on the Grid infrastructure. Thus, the majority of the Grids work in isolation, because the exposed interfaces are incompatible. It is common for the resource needs of grid applications to go beyond what is available in any of the sites making up a Grid. In order for a user to use several grids, running different middleware system, he/she has to be familiar with all the details of these system. In this thesis we look into the challenging requirements for virtualizing the grid middleware systems and enabling clients to submit to several Grids with one unified interface. The developed application is easily extensible, thus allowing the integration with other middleware systems too. Managing credentials, jobs and data is done in a unified way. At the moment the gMInION abstract layer allows users to access the Grid resources which use the gLite or Globus middleware. An experimental evaluation of access latencies and added overhead is presented. These results show that the overheads introduced for using the new gMInION services are acceptable. The developed system can be a valuable asset for individual clients or for workflow manager systems and further research into Grid middleware independent submission systems. regards, Oscar * (From the Nikhef mainhall/coffee area): N041 is located down the corridor towards the old UvA F-building. Before entering the F-building, take a right. Walk 'til the end (next to the Nikhef workshop area) and take a left-left and you're there.

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ct-grid October 2010