2021-06-12
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LLAMA: The Low Level Abstraction For Memory Access
/ Gruber, Bernhard Manfred (CERN ; Dresden, Tech. U.) ; Amadio, Guilherme (CERN) ; Blomer, Jakob (CERN) ; Matthes, Alexander (HZDR, Dresden) ; Widera, René (HZDR, Dresden) ; Bussmann, Michael (HZDR, Dresden)
The performance gap between CPU and memory widens continuously. [...]
arXiv:2106.04284.
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2021. - 32 p.
00011 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00009 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00010 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00008 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00000 Conceptual overview of LLAMA. - 00001 Overview of the C++ library components of LLAMA. - 00007 : Caption not extracted - 00004 : Move with 256Mi particles - 00005 : Caption not extracted - 00002 Concept of LLAMA mappings. A mapping defines how a record and array dimension index tuple is translated into a blob number and offset. - 00006 : Move with 256Mi particles - 00003 : Caption not extracted - Fulltext
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Recent Progress on the Commissioning of a Gas Curtain Beam Profile Monitor Using Beam Induced Fluorescence for High Luminosity LHC
/ Mazzoni, Stefano (CERN) ; Ady, Marton (CERN) ; Forck, Peter (Darmstadt, GSI) ; Jones, Owain Rhodri (CERN) ; Kumar, Narender (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) ; Papazoglou, Ioannis (CERN) ; Pasquino, Chiara (CERN) ; Rossi, Adriana (CERN) ; Sadovich, Sergey (CERN) ; Salehilashkajani, Amir (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) et al.
For the high-luminosity upgrade of the Large Hadron Collider, active control of proton/ion beam halo will be essential for safe and reliable operation [...]
2020. - 5 p.
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A Beam Profile Monitor for High Energy Proton Beams Using Microfabrication Techniques
/ Mateu, Isidre (CERN) ; Bouvet, Didier (Ecole Polytechnique, Lausanne) ; Farabolini, Wilfrid (CERN) ; Gilardi, Antonio (CERN) ; Gkotse, Blerina (CERN) ; Mapelli, Alessandro (CERN) ; Meskova, Viktoria (CERN) ; Pezzullo, Giuseppe (CERN) ; Ravotti, Federico (CERN) ; Sallese, Jean-Michel (Ecole Polytechnique, Lausanne) et al.
In High Energy Physics experiments it is a common practice to expose electronic components and systems to particle beams, in order to assess their level of radiation tolerance when operating in a radiation environment. [...]
2020. - 4 p.
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Simulation Methods for Transverse Beam Size Measurements Using the Heterodyne Near Field Speckles of Hard X-rays
/ Goetz, Alexander (CERN) ; Butti, Daniele (CERN) ; Iriso, Ubaldo (CELLS - ALBA, LLS) ; Mazzoni, Stefano (CERN) ; Nosych, Andriy (CELLS - ALBA, LLS) ; Paroli, Bruno (Milan U.) ; Potenza, Marco (INFN, Milan ; Milan U.) ; Siano, Mirko (Milan U.) ; Teruzzi, Luca (Milan U.) ; Torino, Laura (CELLS - ALBA, LLS) et al.
The Heterodyne Near Field Speckles (HNFS) is a special type of interferometry technique where radiation is scattered by nanoparticles suspended in a medium. [...]
2020. - 4 p.
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Properties of Cherenkov Diffraction Radiation as Predicted by the Polarisation Currents Approach for Beam Instrumentation
/ Harryman, Daniel (Royal Holloway, U. of London) ; Bergamaschi, Michele (CERN) ; Bobb, Lorraine (Garsington, Oxfordshire) ; Fedorov, Kirill (Royal Holloway, U. of London) ; Karataev, Pavel (Royal Holloway, U. of London) ; Kieffer, Robert (CERN) ; Łasocha, Kacper (CERN) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Potylitsyn, Alexander (Tomsk Polytechnic U.) et al.
Cherenkov-Diffraction Radiation (ChDR) appears when a charged particle moves in the vicinity of a dielectric medium with velocity higher than the phase velocity of light inside the medium. [...]
2020. - 5 p.
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