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ACM Transactions on Modeling and Computer Simulation (TOMACS), Volume 7 Issue 4, Oct. 1997

Editorial
David Nicol
Page: 424
DOI: 10.1145/268403.269944

Computing global virtual time in shared-memory multiprocessors
Richard M. Fujimoto, Maria Hybinette
Pages: 425-446
DOI: 10.1145/268403.268404
Global virtual time (GVT) is used in the Time Warp synchronization mechanism to perform irrevocable operations such as I/O and to reclaim storage. Most existing algorithms for computing GVT assume a message-passing programming model. Here, GVT...

Random variate generation for multivariate unimodal densities
Luc Devroye
Pages: 447-477
DOI: 10.1145/268403.268413
A probability density on a finite-dimensional Euclidean space is orthounimodal with a given mode if within each orthant (quadrant) defined by the mode, the density is a monotone function of each of its arguments individually. Up to a linear...

Variance reduction applied to product form multiclass queuing networks
Bruno Tuffin
Pages: 478-500
DOI: 10.1145/268403.268419
Performance of product-form multiclass queuing networks can be determined from normalization constants. For large models, the evaluation of these performance metrics is not possible because of the required amount of computer resources (either by...

Modeling formalisms for dynamic structure systems
Fernando J. Barros
Pages: 501-515
DOI: 10.1145/268403.268423
We present a new concept for a system network to represent systems that are able to undergo structural change. Change in structure is defined in general terms, and includes the addition and deletion of systems and the modification of the...