This report is the result of a six-month graduating term for the Operating Systems and Distributed Systems group of the Technical University of Delft. This assignment was performed within the Computer System Group of NIKHEF (National Institute for Nuclear Physics and High-Energy Physics) under the supervision of R. van Dantzig (Spin Muon Collaboration), and I.S. Herschberg, D.H.J. Epema and J.F.C.M. de Jongh (Technical University of Delft)

This report contains the results of the graduation project for the Computer Science course at the University of Amsterdam. The work for the project was done within the Information & Communication Service department at Shell Research, Amsterdam (Koninklijke/ShellLaboratorium, Amsterdam), where I have been employed since 1985. Professor Dr. L.O. Hertzberger, Dr. P.M.A. Sloot, Dr. P. van Emde Boas (University of Amsterdam) and Dr. P.A.J. van Deurzen (Shell Research, Amsterdam) were the supervisors. The initial goal of the project, defined in the spring of 1992, was to explore to what extent distributed systems could contribute to a more efficient use of the networked workstations installed at KSLA (Koninklijke/Shell-Laboratorium, Amsterdam). Follows some initial problems in defining the scope of the project, the idea was born to use PVM and Condor - two available packages supporting distributed computing - to run an existing scientific application. This would pave the way for a test with the DCE (Distributed Computing Environment) products from OSF (Open Software Foundation). However, partially due to personnel movement the test with the scientific application had to be postponed. The results of this study are: - a rudimentary form of DYNAMICPVM which combines PVM and Condor, - a better understanding of the impact the introduction of distributed systems will have on the KSLA organisation. I would like to thank Professor Hertzberger, who put me on the right track, Peter Sloot, who kept me on the track and Paul van Deurzen who patiently guided me past many obstacles during the project and had his interrupt bit turned off for me. A. de Beer, Th. Breet, R.P. Bosma and G. Noordenbos have provided me royally, on behalf of Shell, with all the facilities I required for this course...

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This report is the result of a two-month literature study on scheduling in distributed systems. This assignment was performed within the Computer System Group of NIKHEF (National Institute for Nuclear Physics and High-Energy Physics) under the supervision of R. van Dantzig (Spin Muon Collaboration) and D. Epema (Technical University of Delft)

this paper we describe a first design and implementation of a Condor flock. The motivation was to be able to share computing power between NIKHEF