
Scientific and Multimedia Applications 195
FIGURE 7.9: Typical graph of speed-up vs. the number of paths with inde-
pendent services.
This is then extended with further experiments considering impact of the cost
bound on performance.
Furthermore, the workflow management system proposed in Section 6.2
allows for consideration of alternative computing paths with various quality
characteristics that might refer to
1. cost of solutions,
2. reliability, and
3. conformance with requirements, etc.
The proposed model allows for description of services and correspondingly
a path of tasks with services using various quality metrics. As an example,
Figure 7.11 pres