Rob Pooley, Jane Hillston (auth.), Jane Elizabeth Hillston's 7th UK Computer and Telecommunications Performance PDF

By Rob Pooley, Jane Hillston (auth.), Jane Elizabeth Hillston BA, MSc, Peter John Beaufoy King BSc, MSc, PhD, C.Eng, MBCS, Robert John Pooley BSc, MSc (eds.)

Performance engineering is a fast-moving box the place advances in expertise suggest that new concerns consistently have to be addressed. in line with this, the united kingdom laptop and Telecommunications functionality Engineering workshops have been manage in 1985 to supply a invaluable chance for the dialogue and alternate of principles. they've got therefore turn into good validated because the concentration for tutorial and commercial practitioners from the united kingdom and Europe with an curiosity in functionality and modelling and research. This quantity comprises the sixteen papers which have been awarded on the seventh annual workshop, held in Edinburgh in July 1991. The workshop highlighted quite a few features of parallel computing - a space that's attracting an expanding volume of curiosity - and the paintings offered in those papers is of specific curiosity because the participants used genuine research to guage their versions. The papers conceal an strangely wide selection of issues, either sensible and theoretical, together with advances in queueing conception, universal functionality difficulties and their strategies, tests of accessible instruments and displays of latest theoretical effects. the result's a very entire insurance of this crucial and difficult box. This quantity presents an up to date review of labor being conducted by way of functionality engineers within the united kingdom and Europe and may be a useful reference e-book for researchers and practitioners wishing to familiarise themselves with the advantages of functionality and analysis.

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Additional resources for 7th UK Computer and Telecommunications Performance Engineering Workshop: Edinburgh, 22–23 July 1991

Example text

Each process needs very little information. It needs to know to which other processes it is connected and how it should decide on the length of its computation ph ase and communication packets. These are passed as simple numbers to each process. It then uses these numbers as parameters to a statistica! distribution to select the values at each iteration of the loop. Say that we wish to choose the length of the computation phase from a norm al distribution then the process template from the EDL script looks like this Begin Define Processes processl { double mean_compute [ 1000, 2000 ] 10} double sd_compute This suggests that we wish to generate two experiments.

The actual time taken for a computation or message transfer is usually longer than the value specified due to competition for resources. The computational power of the processors and the bandwidth of paths between processors are resources which have to be shared between the competing processes of the concurrent computation. This is achieved by time-slicing processors and queuing messages at links. The mechanisms of process scheduling and message passing are modelled explicitly at a fairly low level.

The corresponding analysis of varianee table is given in Table 2. The latter shows that the differences between the two replicates are very small relative to the estimate of the variability between program instances for the same parameter values (the error mean square) . By contrast the differences between parameter settings (the "t reatment" mean square) are very marked. Each estimate in Table 5, apart from that for the constant term 7o, has the same standard error which is given at the foot of the table, The t-values given in this table are the ratio of estimates to standard error .

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