Why don't you have a tool that automates multicore timing analysis?

Developing a one-button tool solution for multicore timing analysis would be impossible. This is because interference, which can have a huge impact on a task’s execution time, must be taken into account when analyzing multicore timing behavior.

Analyzing interference effects is a difficult challenge that cannot be automatically solved through a software-only solution. Using approaches developed for timing analysis of single-core systems would result in a high level of pessimism, as it would assume that the highest level of interference possible is feasible, while this is almost never the case.