The DESY Grid Centre Haupt, A; Gellrich, A; Kemp, Y ...
Journal of physics. Conference series,
01/2012, Letnik:
396, Številka:
4
Journal Article
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DESY is one of the world-wide leading centers for research with particle accelerators, synchrotron light and astroparticles. DESY participates in LHC as a Tier-2 center, supports on-going analyzes of ...HERA data, is a leading partner for ILC, and runs the National Analysis Facility (NAF) for LHC and ILC in the framework of the Helmholtz Alliance, Physics at the Terascale. For the research with synchrotron light major new facilities are operated and built (FLASH, PETRA-III, and XFEL). DESY furthermore acts as Data-Tier1 centre for the Neutrino detector IceCube. Established within the EGI-project DESY operates a grid infrastructure which supports a number of virtual Organizations (VO), incl. ATLAS, CMS, and LHCb. Furthermore, DESY hosts some of HEP and non-HEP VOs, such as the HERA experiments and ILC as well as photon science communities. The support of the new astroparticle physics VOs IceCube and CTA is currently set up. As the global structure of the grid offers huge resources which are perfect for batch-like computing, DESY has set up the National Analysis Facility (NAF) which complements the grid to allow German HEP users for efficient data analysis. The grid infrastructure and the NAF use the same physics data which is distributed via the grid. We call the conjunction of grid and NAF the DESY Grid Centre. In the contribution to CHEP2012 we will in depth discuss the conceptional and operational aspects of our multi-VO and multi-community Grid Centre and present the system setup. We will in particular focus on the interplay of Grid and NAF and present experiences of the operations.
In this contribution, the model of shared ATLAS Tier-2 and Tier-3 facilities is explained. Data taking in ATLAS has been going on for more than two years. The Tier-2 and Tier-3 facility setup, how do ...we get the data, how do we enable at the same time Grid and local data access, how Tier-2 and Tier-3 activities affect the cluster differently and process of hundreds of millions of events, are described. Finally, an example of how a real physics analysis is working at these sites is shown, and this is a good occasion to see if we have developed all the Grid tools necessary for the ATLAS Distributed Computing community, and in case we do not, to try to fix it, in order to be ready for the foreseen increase in ATLAS activity in the next years.
The German National Analysis Facility (NAF) was set up at DESY, starting end of 2007 in the context of the Helmholtz Alliance "Physics at the Terascale". The NAF complements the DESY and the German ...Grid resources, and hence offers users from the German HEP institutes the best possible environment for data analysis. In the first part, the key aspects and components of the NAF are briefly presented with an emphasis on recent improvements. In the second part, the use cases of the three participating LHC experiments, ATLAS, CMS and LHCb, will be presented. Differences and commonalities in the usage of the NAF will be shown. Special emphasis will be placed on the usage of PROOF, whose usage on the NAF has been pioneered by CMS. It is now adapted by ATLAS. The third part will concentrate on how the NAF was used for detector optimisation studies in the preparation of one of the ILC Lol's (ILD 2009), as well as how CALICE uses the NAF for the analysis of their data taken in several test beam experiments performed for detector R & D. Finally, future developments of the NAF are presented.
Nationwide, African American girls have the highest suspension rates among all racial and ethnic groups. Furthermore, they are the most severely, disproportionately affected by school discipline ...policies and practices when compared with other girls. This case study was developed for use in education leadership programs to critically analyze school discipline policies and practices that disproportionately affect African American girls.
Batch scheduling systems are usually designed to maximise fair resource utilisation and efficiency, but are less well designed for demanding interactive processing, which requires fast access to ...resources while low upstart latency is only of secondary significance for high throughput of high performance computing scheduling systems. The computing clusters at DESY are intended as batch systems for end users to run massive analysis and simulation jobs enabling fast turnaround systems, in particular when processing is expected to feed back to operation of instruments in near real-time. The continuously increasing popularity of Jupyter Notebooks for interactive and online processing made an integration of this technology into the DESY batch systems indispensable. We present here our approach to utilise the HTCondor and SLURM backends to integrate Jupyter Notebook servers and the techniques involved to provide fast access. The chosen approach offers a smooth user experience allowing users to customize resource allocation tailored to their computational requirements. In addition, we outline the differences between the HPC and the HTC implementations and give an overview of the experience of running Jupyter Notebook services.
The increase in the scale of LHC computing during Run 3 and Run 4 (HL-LHC) will certainly require radical changes to the computing models and the data processing of the LHC experiments. The working ...group established by WLCG and the HEP Software Foundation to investigate all aspects of the cost of computing and how to optimise them has continued producing results and improving our understanding of this process. In particular, experiments have developed more sophisticated ways to calculate their resource needs, we have a much more detailed process to calculate infrastructure costs. This includes stud-ies on the impact of HPC and GPU based resources on meeting the computing demands. We have also developed and perfected tools to quantitatively study the performance of experiments workloads and we are actively collaborating with other activities related to data access, benchmarking and technology cost evolution. In this contribution we expose our recent developments and results and outline the directions of future work.
While developmental responsiveness is a deservingly key emphasis of middle grades education, this emphasis has often been to the detriment of focusing on the cultural needs of young adolescents. This ...Handbook volume explores research relating to equity and culturally responsive practices when working with young adolescents. Middle school philosophy largely centers on young adolescents as a collective group. This lack of focus has great implications for young adolescents of marginalized identities including but not limited to those with culturally and linguistically diverse backgrounds, LGBTQ youth, and those living in poverty. If middle level educators claim to advocate for young adolescents, we need to mainstream conversations about supporting all young adolescents of marginalized identities. It empowers researchers, educators, and even young adolescents to critically examine and understand the intersectionality of identities that historically influenced (and continue to affect) young adolescents and why educators might perceive marginalized youth in certain ways.It is for these reasons that researchers, teachers, and other key constituents involved in the education of young adolescents must devote themselves to the critical examination and understanding of the historical and current socio-cultural factors affecting all young adolescents. The chapters in this volume serve as a means to open an intentional and explicit space for providing a critical lens on early adolescence-a lens that understands that both developmental and cultural needs of young adolescents need to be emphasized to create a learning environment that supports every young adolescent learner.
In this contribution, the model of shared ATLAS Tier-2 and Tier-3 facilities is explained. Data taking in ATLAS has been going on for more than two years. The Tier-2 and Tier-3 facility setup, how do ...we get the data, how do we enable at the same time Grid and local data access, how Tier-2 and Tier-3 activities affect the cluster differently and process of hundreds of millions of events, are described. Finally, an example of how a real physics analysis is working at these sites is shown, and this is a good occasion to see if we have developed all the Grid tools necessary for the ATLAS Distributed Computing community, and in case we do not, to try to fix it, in order to be ready for the foreseen increase in ATLAS activity in the next years.
This study examines race differences and the relationship between religiosity/ spirituality and social support on quality of life (QOL) among people living with HIV/AIDS in Dallas/Ft. Worth, TX. The ...data were obtained from the Project VOICES research study conducted by the Center of Psychosocial Health Research at University of North Texas in 2003. This study explores the hypotheses that religiosity/spirituality and social support positively influences quality of life among people living with HIV/AIDS. The current study uses a diverse, gender-balanced sample consisting of African Americans (n = 156), aged 20-68, 47% male, 52% female and 1% transgendered) and Non-African Americans (n = 131), aged 19-65, 50% male, 46% female and 3% transgendered) (Caucasian, Latino, & others) to evaluate the relationship among variables of interest. Multiple regression analyses revealed that social support was a significant factor explaining quality of life (QOL) for African Americans when controlling for medical variables but did not for non-African Americans. Religiosity/spirituality was not found to be significant in this study. The implications of the findings are discussed.
Kemp analyzes Audre Lorde's writing power. By reconciling Lorde's use of the erotic and its employment in identity construction, her continued reclamation and placement as African Caribbean writer ...can be given expanded meaning as a logical conclusion.
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