Next: S(m) graph Up: Performance modelling Previous: C/A and S/A ratio display field

T(V) graph

This graph shows the relationship between the entire calculation time C_max (including communications and computations) and size of problem V. Schedule length C_max is denoted T(V) in this graph. The shape of displayed curves depends on the selected architecture and C/A and S/A values.

T(V) graph can be displayed in two scales: linear and logarithmic. You can change it by clicking on the graph area. The current status of the display is shown at the top of graph.

Minimum and maximum values of calculation time are shown at T(V) axis (rounded to one digit).

For every architecture no more than five curves with a legend (top of graph) are displayed. These curves indicate dependence of schedule length vs. V.

• for chain and star - for different numbers of processors,
• for mesh - for different numbers of layers,
• for hypercube - for different numbers of dimensions.

Note that a feasible solution (i.e. with >0) can be found only for certain m and V for the given C/A, S/A. Points for which a feasible solution does not exist are not shown in the graph. Therefore, not every curve starts at V=1e0.