[...]... approach for grid applications, where interactive connections are required With the solution implemented in glogin, users are able to utilize the grid for interactive applications much in the same way as on standard workstations This opens a series of new possibilities for next generation grid software Keywords: 1 grid computing, interactivity Introduction Grid environments are todays most promising computing. .. [Basu03] This solution is based on using VNC [Rich98], and can be compared to X 11 -forwarding with gsh/glogin In practise, it has turned out that VNC is a useful but sometimes slow protocol with unreliable graphic operations With glogin, we have a local visualisation frontend and a remote grid- application, which can communicate 10 DISTRIBUTED AND PARALLEL SYSTEMS over a UNIX pipe or TCP sockets This...x DISTRIBUTED AND PARALLEL SYSTEMS and ensuring the high quality of DAPSYS 2004 The local organisation was managed by Judit Ajpek from CongressTeam 2000 and Agnes Jancso from MTA SZTAKI Our thanks is due to the sponsors of the DAPSYS/EuroPVM joint event: IBM (platinum), Intel (gold) and NEC (silver) Finally, we are grateful to Susan Lagerstrom-Fife and Sharon Palleschi from... key to the gridmap-file, which determines the user-id This user-id has to match the user-id currently in use If it does not, then the session was hijacked and we have to terminate instantly 8 DISTRIBUTED AND PARALLEL SYSTEMS Otherwise, we have a bidirectional connection ready for interactive use All we have to do now is to actually instruct glogin what to do Getting shells and other commands glogin... left blank I GRID SYSTEMS This page intentionally left blank GLOGIN - INTERACTIVE CONNECTIVITY FOR THE GRID* Herbert Rosmanith and Jens Volkert GUP, Joh Kepler University Linz Altenbergerstr 69, A-4040 Linz, Austria/Europe hr@gup.uni–linz.ac.at Abstract Todays computational grids are used mostly for batch processing and throughput computing, where jobs are submitted to a queue, processed, and finally... made available for grid environments With glogin, users can thus perform interactive commands in the grid just as on their local workstations The glogin tool is part of the Grid Visualisation Kernel [Kran03], which attempts to provide visualisation services as a kind of grid middleware extension However, due to successful installation of glogin and the many requests received by the grid community, glogin... received by the grid community, glogin has been extracted and packaged as a stand-alone tool Besides the basic functionality described in this paper, glogin has been extended towards forwarding arbitrary TCP-traffic the same way ssh does: this includes securely tunneling X 11- connections over the grid as well as building VPNs and supporting multiple local and remote TCP-port-forwarders The usability of these... Globus-gatekeeper, we will see nothing for the first 10 seconds, then, all at once, the numbers from 0 to 9 will be displayed, followed by a another 10 second pause, after which the numbers from 10 to 19 will be displayed and so on until we terminate the job Getting Interactive Connections The solution is as follows: since the connection between the GASS server and Globus-gatekeeper can only be used for job-submission,... interactive command-shell we desire? The way to do this is described in this paper and has been implemented as the prototype tool glogin1 As we work with our shell, we will recognise that we have got “true interactivity” in the grid Keystrokes are sent to the grid- node only limited by the speed of the network Based on this approach, we might now ask how we can control any interactive grid- application,... workstation As an additional bonus, forwarding of X 11 traffic has also been implemented It differs from port forwarding in that we have to take care of authentication (the X-Server may only accept clients with the matching “cookie”) While port forwarding requires that each new remote connection results in a new local connection, multiple X 11 clients are sent to one X 11 server only 4 Related Work The importance . alt="" DISTRIBUTED AND PARALLEL SYSTEMS CLUSTER AND GRID COMPUTING THE KLUWER INTERNATIONAL SERIES IN ENGINEERING AND COMPUTER SCIENCE DISTRIBUTED AND PARALLEL SYSTEMS CLUSTER AND GRID COMPUTING edited. Szkaliczki, Laszlo Boszormenyi 73 83 93 10 3 11 3 12 1 12 9 13 7 14 7 15 5 16 5 vii Component Based Flight Simulation in DIS Systems Krzysztof Mieloszyk, Bogdan Wiszniewski 17 3 Part VI Algorithms Management. Problem Agnieszka Debudaj-Grabysz and Zbigniew J. Czech 2 01 Author Index 211 This page intentionally left blank Preface DAPSYS (Austrian-Hungarian Workshop on Distributed and Parallel Sys- tems) is an