Description
Online Computing
-
Z. Toteva (Sofia University/CERN/CMS)28/09/2004, 10:00Track 6 - Computer FabricsposterWe describe a database solution in a web application to centrally manage the configuration information of computer systems. It extends the modular cluster management tool Quattor with a user friendly web interface. System configurations managed by Quattor are described with the aid of PAN, a declarative language with a command line and a compiler interface. Using a relational schema,...Go to contribution page
-
A. Bobyshev (FERMILAB)28/09/2004, 10:00Track 7 - Wide Area NetworkingposterIn a large campus network, such as Fermilab's ten thousand nodes, scanning initiated from either outside of or within the campus network raises security concerns, may have very serious impact on network performance, and even disrupt normal operation of many services. In this paper we introduce a system for detecting and automatic blocking of excessive traffic of different nature, scanning,...Go to contribution page
-
Martin purschke28/09/2004, 10:00Track 1 - Online ComputingposterWith the improvements in CPU and disk speed over the past years, we were able to exceed the original design data logging rate of 40MB/s by a factor of 3 already for the Run 3 in 2002. For the Run 4 in 2003, we increased the raw disk logging capacity further to about 400MB/s. Another major improvement was the implementation of compressed data logging. The PHENIX raw data, after...Go to contribution page
-
M. Guijarro (CERN)28/09/2004, 10:00Track 6 - Computer FabricsposterThere are two cluster architecture approaches used at CERN to provide central CVS services. The first one (http://cern.ch/cvs) depends on AFS for central storage of repositories and offers automatic load-balancing and fail-over mechanisms. The second one (http://cern.ch/lcgcvs) is an N + 1 cluster based on local file systems, using data replication and not relying on AFS. It does not...Go to contribution page
-
Martin purschke28/09/2004, 10:00Track 1 - Online ComputingposterThe PHENIX DAQ system is managed by a control system responsible for the configuration and monitoring of the PHENIX detector hardware and readout software. At its core, the control system, called Runcontrol, is a process that manages the various components by way of a distributed architecture using CORBA. The control system, called Runcontrol, is a set of process that manages virtually...Go to contribution page
-
J. Schmidt (Fermilab)28/09/2004, 10:00Track 6 - Computer FabricsposterEmail is an essential part of daily work. The FNAL gateways process in excess of 700,000 messages per week. Amomng those messages are many containing viruses and unwanted spam. This paper outlines the FNAL email system configuration. We will discuss how we have defined our systems to provide optimum uptime as well as protection against viruses, spam and unauthorized users.Go to contribution page
-
L. Lisa Giacchetti (FERMILAB)28/09/2004, 10:00Track 6 - Computer FabricsposterThe scalable serving of shared filesystems across large clusters of computing resources continues to be a difficult problem in high energy physics computing. The US CMS group at Fermilab has performed a detailed evaluation of hardware and software solutions to allow filesysystem access to data from computing systems. The goal of the evaluation was to arrive at a solution that was able...Go to contribution page
-
S. Kolos (CERN)28/09/2004, 10:00Track 1 - Online ComputingposterAs modern High Energy Physics (HEP) experiments require more distributed computing power to fulfill their demands, the need for an efficient distributed online services for control, configuration and monitoring in such experiments becomes increasingly important. This paper describes the experience of using standard Common Object Request Broker Architecture (CORBA) middleware for...Go to contribution page
-
J. Fromm (Fermilab)28/09/2004, 10:00Track 6 - Computer FabricsposterThe NGOP Monitoring Project at FNAL has developed a package which has demonstrated the capability to efficiently monitor tens of thousands of entities on thousands of hosts, and has been in operation for over 4 years. The project has met the majority of its initial reqirements, and also the majority of the requirements discovered along the way. This paper will describe what worked, and...Go to contribution page
-
S. Jarp (CERN)28/09/2004, 10:00Track 6 - Computer FabricsposterIn 1995 I predicted that the dual-processor PC would start invading HEP computing and a couple of years later the x86-based PC was omnipresent in our computing facilities. Today, we cannot imagine HEP computing without thousands of PCs at the heart. This talk will look at some of the reasons why we may one day be forced to leave this sweet-spot. This would be not because we (the HEP...Go to contribution page
-
F.M. Taurino (INFM - INFN)28/09/2004, 10:00Track 6 - Computer FabricsposterThe "gridification" of a computing farm is usually a complex and time consuming task. Operating system installation, grid specific software, configuration files customization can turn into a large problem for site managers. This poster introduces InGRID, a solution used to install and maintain grid software on small/medium size computing farms. Grid elements installation with InGRID...Go to contribution page
-
G. Sun (INSTITUE OF HIGH ENERGY PHYSICS)28/09/2004, 10:00Track 6 - Computer FabricsposterThese are several on-going experiments at IHEP, such as BES, YBJ, and CMS collaboration with CERN. each experiment has its own computing system, these computing systems run separately. This leads to a very low CPU utilization due to different usage period of each experiment. The Grid technology is a very good candidate for integrating these separate computing systems into a "single...Go to contribution page
-
H. Schwarthoff (CORNELL UNIVERSITY)28/09/2004, 10:00Track 1 - Online ComputingposterThe CLEO collaboration at the Cornell electron positron storage ring CESR has completed its transition to the CLEO-c experiment. This new program contains a wide array of Physics studies of $e^+e^-$ collisions at center of mass energies between 3 GeV and 5 GeV. New challenges await the CLEO-c Online computing system, as the trigger rates are expected to rise from < 100 Hz to around...Go to contribution page
-
N. Hoeimyr (CERN IT)28/09/2004, 10:00Track 6 - Computer FabricsposterThe Product Support (PS) group of the IT department at CERN distributes and supports more than one hundred different software packages, ranging from tools for computer aided design, field calculations, mathematical and structural analysis to software development. Most of these tools, which are used on a variety of Unix and Windows platforms by different user populations, are...Go to contribution page
-
A. Bobyshev (FERMILAB)28/09/2004, 10:00Track 7 - Wide Area NetworkingposterNetwork flow data gathered on border routers and core network switch/routers is used at Fermilab for statistical analysis of traffic patterns, passive network monitoring, and estimation of network performance characteristics. Flow data is also a critical tool in the investigation of computer security incidents. Development and enhancement of flow- based tools is on-going effort. The...Go to contribution page
-
I. Sfiligoi (INFN Frascati)28/09/2004, 10:00Track 6 - Computer FabricsposterCDF is deploying a version of its analysis facility (CAF) at several globally distributed sites. On top of the hardware at each of these sites is either an FBSNG or Condor batch manager and a SAM data handling system which in some cases also makes use of dCache. The jobs which run at these sites also make use of a central database located at Fermilab. Each of these systems has its own...Go to contribution page
-
N. Katayama (KEK)28/09/2004, 10:00Track 6 - Computer FabricsposterThe Belle experiment has accumulated an integrated luminosity of more than 240fb-1 so far, and a daily logged luminosity now exceeds 800pb- 1. These numbers correspond to more than 1PB of raw and processed data stored on tape and an accumulation of the raw data at the rate of 1TB/day. To meet these storage demands, a new cost effective, compact hierarchical mass storage system has...Go to contribution page
-
Martin purschke28/09/2004, 10:00Track 1 - Online ComputingposterThe PHENIX experiment consists of many different detectors and detector types, each one with its own needs concerning the monitoring of the data quality and the calibration. To ease the task for the shift crew to monitor the performance and status of each subsystem in PHENIX we developed a general client server based framework which delivers events at a rate in excess of 100Hz....Go to contribution page
-
S. Nemnyugin (ASSOCIATE PROFESSOR)28/09/2004, 10:00Track 6 - Computer FabricsposterWe report the results of parallelization and tests of the Parton String Model event generator at the parallel cluster of St.Petersburg State University Telecommunication center. Two schemes of parallelization were studied. In the first approach master process coordinates work of slave processes, gathers and analyzes data. Results of MC calculations are saved in local files. Local...Go to contribution page
-
J. Schmidt (Fermilab)28/09/2004, 10:00Track 6 - Computer FabricsposterFNAL has over 5000 PCs running either Linux or Windows software. Protecting these systems efficiently against the latest vulnerabilities that arise has prompted FNAL to take a more central approach to patching systems. We outline the lab support structure for each OS and how we have provided a central solution that works within existing support boundaries. The paper will cover how we...Go to contribution page
-
P. Conde MUINO (CERN)28/09/2004, 10:00Track 1 - Online ComputingposterDuring the runtime of any experiment, a central monitoring system that detects problems as soon as they appear has an essential role. In a large experiment, like Atlas, the online data acquisition system is distributed across the nodes of large farms, each of them running several processes that analyse a fraction of the events. In this architecture, it is necessary to have a central...Go to contribution page
-
A. Eleuteri (DIPARTIMENTO DI SCIENZE FISICHE - UNIVERSITà DI NAPOLI FEDERICO II)28/09/2004, 10:00Track 1 - Online ComputingposterIn this paper we examine the performance of the raw Ethernet protocol in deterministic, low-cost, real-time communication. Very few applications have been reported until now, and they focus on the use of the TCP and UDP protocols, which however add a sensible overhead to the communication and reduce the useful bandwidth. We show how low-level Ethernet access can be used for...Go to contribution page
-
28/09/2004, 10:00Track 7 - Wide Area NetworkingposterThe CLEO III data acquisition was from the beginning in the late 90's designed to allow remote operations and monitoring of the experiment. Since changes in the coordination and operation of the CLEO experiment two years ago enabled us to separate tasks of the shift crew into an operational and a physics task, existing remote capabilities have been revisited. In 2002/03 CLEO started to...Go to contribution page
-
A. Garcia (KARLSRUHE RESEARCH CENTER (FZK))28/09/2004, 10:00Track 6 - Computer FabricsposterThe clusters using DataGrid middleware are usually installed and managed by means of an "LCFG" server. Originally developed by the Univ. of Edinburgh and extended by DataGrid, this is a complex piece of software. It allows for automated installation and configuration of a complete grid site. However, installation of the "LCFG"-Server takes most of the time, thus hinder widespread...Go to contribution page
-
V. GAUTARD (CEA-SACLAY)28/09/2004, 10:00Track 1 - Online ComputingposterATLAS is a particle detector which will is being built at CERN in Geneva. The muon detection system is made up among other things, of 600 chambers measuring 2 to 6 m2 and 30 cm thick. The chambers' position must be known with an accuracy of +/- 30 m for translations and +/-100 rad for rotations for a range of +/- 5mm and +/-5mrad. In order to fulfill these requirements, we have...Go to contribution page
-
G. unel (UNIVERSITY OF CALIFORNIA AT IRVINE AND CERN)28/09/2004, 10:00Track 1 - Online ComputingposterThe 40 MHz collision rate at the LHC produces ~25 interactions per bunch crossing within the ATLAS detector, resulting in terabytes of data per second to be handled by the detector electronics and the trigger and DAQ system. A Level 1 trigger system based on custom designed and built electronics will reduce the event rate to 100 kHz. The DAQ system is responsible for the readout of the...Go to contribution page
-
Ian FISK (FNAL)28/09/2004, 10:00Track 6 - Computer FabricsposterUS-CMS is building up expertise at regional centers in preparation for analysis of LHC data. The User Analysis Farm (UAF) is part of the Tier 1 facility at Fermilab. The UAF is being developed to support the efforts of the Fermilab LHC Physics Center (LPC) and to enableefficient analysis of CMS data in the US. The support, infrastructure, and services to enable a local analysis...Go to contribution page
-
28/09/2004, 10:00Track 5 - Distributed Computing Systems and ExperiencesposterThe CDF Analysis Facility (CAF) has been in use since April 2002 and has successfully served 100s of users on 1000s of CPUs. The original CAF used FBSNG as a batch manager. In the current trend toward multisite deployment, FBSNG was found to be a limiting factor, so the CAF has been reimplemented to use Condor instead. Condor is a more widely used batch system and is well integrated...Go to contribution page
-
I. Soloviev (CERN/PNPI)28/09/2004, 10:00Track 1 - Online ComputingposterThe ATLAS data acquisition system uses the database to describe configurations for different types of data taking runs and different sub-detectors. Such configurations are composed of complex data objects with many inter-relations. During the DAQ system initialisation phase the configurations database is simultaneously accessed by a large number of processes. It is also required that such...Go to contribution page
-
A. Martin (QUEEN MARY, UNIVERSITY OF LONDON)28/09/2004, 10:00Track 6 - Computer FabricsposterWe describe our experience in building a cost efficient High Throughput Cluster (HTC) using commodity hardware and free software within a university environment. Our HTC has a modular system architecture and is designed to be upgradable. The current, second phase configuration, consists of 344 processors and 20 Tbyte of RAID storage. In order to rapidly install and upgrade software,...Go to contribution page
-
O. Schneider (FZK)28/09/2004, 10:00Track 6 - Computer FabricsposterA central idea of Grid Computing is the virtualization of heterogeneous resources. To meet this challenge the Institute for Scientific Computing, IWR, has started the project CampusGrid. Its medium term goal is to provide a seamless IT environment supporting the on-site research activities in physics, bioinformatics, nanotechnology and meteorology. The environment will include all...Go to contribution page
-
Alan Tackett28/09/2004, 10:00Track 6 - Computer FabricsposterProtein analysis, imaging, and DNA sequencing are some of the branches of biology where growth has been enabled by the availability of computational resources. With this growth, biologists face an associated need for reliable, flexible storage systems. For decades the HEP community has been driving the development of such storage systems to meet their own needs. Two of these systems -...Go to contribution page
-
A. Bobyshev (FERMILAB)28/09/2004, 10:00Track 7 - Wide Area NetworkingposterThe Compact Muon Solenoid (CMS) experiment at CERN's Large Hadron Collider (LHC) is scheduled to come on-line in 2007. Fermilab will act as the CMS Tier-1 center for the US and make experiment data available to more than 400 researchers in the US participating in the CMS experiment. The US CMS Users Facility group, based at Fermilab, has initiated a project to develop a model for...Go to contribution page