You are working on a project that is integrating code from multiple development groups.

You are working on a project that is integrating code from multiple development groups. There have been numerous integration problems, particularly regarding reliability, error recovery and transactional integrity. You are now responsible for planning the performance efficiency testing for this product. There Is a strong feeling among the development managers that some parts of the code are weaker than others and will tend to exhibit problems during the performance efficiency testing. To identify these problematic areas as soon as possible, which type of testing should you do?