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Monitoring is an indispensable tool for the operation of any large installation of grid or cluster computing, be it high energy physics or elsewhere. Usually, monitoring is configured to collect a small amount of data, just enough to enable detection of abnormal conditions. Once detected, the abnormal condition is handled by gathering all information from the affected components. This data is processed by querying it in a manner similar to a database.
This contribution shows how the metaphor of a debugger (for software applications) can be transferred to a compute cluster. The concepts of variables, assertions and breakpoints that are used in debugging can be applied to monitoring by defining variables as the quantities recorded by monitoring and breakpoints as invariants formulated via these variables. It is found that embedding fragments of a data extracting and reporting tool such as the UNIX tool awk facilitates concise notations for commonly used variables since tools like awk are designed to process large event streams (in textual representations) with bounded memory. A functional notation similar to both the pipe notation used in the UNIX shell and the point-free style used in functional programming simplify the combination of variables that commonly occur when formulating breakpoints.
Measurement of ϒ(1S) elliptic flow at forward rapidity in Pb-Pb collisions at √sNN = 5.02 TeV
(2019)
The first measurement of the ϒ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5 < y < 4) in Pb–Pb collisions at √sNN = 5.02 TeV with the ALICE detector at the LHC. The results are obtained with the scalar product method and are reported as a function of transverse momentum (pT) up to 15 GeV/c in the 5%–60% centrality interval. The measured Υ(1S)v2 is consistent with 0 and with the small positive values predicted by transport models within uncertainties. The v2 coefficient in 2 < pT < 15 GeV/c is lower than that of inclusive J/ψ mesons in the same pT interval by 2.6 standard deviations. These results, combined with earlier suppression measurements, are in agreement with a scenario in which the Υ(1S) production in Pb–Pb collisions at LHC energies is dominated by dissociation limited to the early stage of the collision, whereas in the J/ψ case there is substantial experimental evidence of an additional regeneration component.
The production of K∗(892)0 and ϕ(1020) mesons has been measured in p–Pb collisions at √sNN = 5.02 TeV. K∗0 and ϕ are reconstructed via their decay into charged hadrons with the ALICE detector in the rapidity range - 0.5 < y < 0. The transverse momentum spectra, measured as a function of the multiplicity, have a pT range from 0 to 15 GeV/c for K∗0 and from 0.3 to 21 GeV/c for ϕ. Integrated yields, mean transverse momenta and particle ratios are reported and compared with results in pp collisions at √s = 7 TeV and Pb–Pb collisions at √sNN = 2.76 TeV. In Pb–Pb and p–Pb collisions, K∗0 and ϕ probe the hadronic phase of the system and contribute to the study of particle formation mechanisms by comparison with other identified hadrons. For this purpose, the mean transverse momenta and the differential proton-to-ϕ ratio are discussed as a function of the multiplicity of the event. The short-lived K∗0 is measured to investigate re-scattering effects, believed to be related to the size of the system and to the lifetime of the hadronic phase.
We present results on transverse momentum (pT) and rapidity (y) differential production cross sections, mean transverse momentum and mean transverse momentum square of inclusive J/ψ and ψ(2S) at forward rapidity (2.5 < y < 4) as well as ψ(2S)-to-J/ψ cross section ratios. These quantities are measured in pp collisions at center of mass energies s√=5.02 and 13 TeV with the ALICE detector. Both charmonium states are reconstructed in the dimuon decay channel, using the muon spectrometer. A comprehensive comparison to inclusive charmonium cross sections measured at s√=2.76, 7 and 8 TeV is performed. A comparison to non-relativistic quantum chromodynamics and fixed-order next-to-leading logarithm calculations, which describe prompt and non-prompt charmonium production respectively, is also presented. A good description of the data is obtained over the full pT range, provided that both contributions are summed. In particular, it is found that for pT > 15 GeV/c the non-prompt contribution reaches up to 50% of the total charmonium yield.
Großer Umzug von Kursen: Eine Lernplattform macht Platz für das Nachfolgemodell - PD Dr. Jeannette Schmid Neuer Verleihservice des HRZ Service Center Riedberg - Thomas Tomala Citavi ab sofort kostenlos an der Goethe-Universität -Patrick Hilt Für Neueinsteiger - Kaori Schütz Die Software Frage: Wechsel zu Office 2007 - Wolfgang J. Weber Überblick über die Dienstleistungen des HRZ
Videokonferenzen: Auf dem Weg zur vereinheitlichten Kommunikationsstruktur - Eberhard Nowak Neues vom HRZ Service Center Riedberg Thomas Tomala „Voice over IP“ (VoIP) an der Uni - Andreas Schmitter und André Karl Spamfilter – so bleibt Ihr E-Mailpostfach spamfrei - Arnold Jäger Für Neueinsteiger - Kaori Schütz Personalia Die Softwarefrage: Laut vorlesen - Wolfgang J. Weber
Hochschulrechenzentrum eröffnet Service Center Riedberg - Thomas Tomala Videokonferenzen - Eberhard Nowak Neue Lernplattform erfolgreich gestartet - Ruth Kurschat Besuch aus Bangkok - Ruth Kurschat HRZ Streaming-Server - Christian Stuck 25 Jahre RRZN-Handbücher - Alfred Weiser, Karim Stiebing Anmeldeformulare- wie Ihnen das HRZ bei der Veranstaltungsplanung helfen kann - Dennis S. Weiss Bewährtes von der Sonnenseite des HRZ Thin Clients: SunRays - Markus Michalek Für Neueinsteiger - Kaori Schütz Neues über SPSS - Alexander Rausch Die Softwarefrage: ZIP-komprimierte Ordner - Wolfgang J. Weber Überblick über die Dienstleistungen des HRZ
Videokonferenzen - Eberhard Nowak QIS - Webbasierte Selbstbedienungsfunktionen der Prüfungsverwaltung - Jan Wauschkuhn LoadLeveler - Dennis S. Weiss Literaturverwaltungssoftware - Patrick Hilt Und Gigabit steht nicht nur im Prospekt - PD Dr. Hansjörg Ast Poster schützen und konservieren - Laminieren - PD Dr. Hansjörg Ast Girls Day 2007 - Ruth Kurschat Windows 2000/XP Installations-CDs mit integrierten Patches für Administratoren - Thomas Tomala Neues von der Sonnenseite des HRZ: ZFS - Markus Michalek Personalia Für Neueinsteiger - Kaori Schütz Die Softwarefrage - Wolfgang J. Weber
Die Goethe-Card – ein komplexes DV-System - PD Dr. Hansjörg Ast Service an einem Ort zusammengefasst - Alfred Weiser Videoüberwachung in Poolräumen - Michael Lehmann Lernplattform WebCT wird immer beliebter -Ruth Kurschat Computersicherheit: Spyware - Sebastian Witt Neues von der Sonnenseite des HRZ - Markus Michalek Für Neueinsteiger - Karim Stiebing Die Softwarefrage - Wolfgang J. Weber Ad-Aware - Nachtrag zur Ausgabe 08 - Thomas Purzer Überblick über die Dienstleistungen des HRZ