A process is the virtual address space and control information necessary for the execution of a program, while threads are a way for a program to split into two or more simultaneously running tasks.
Scott Barber has released a book named “Performance Testing Guidance for Web Applications”, on the approach, planning and analysis for Load Testing. As they say, the book is “tool agnostic” or tool independent. Though I found that this book becomes a bit repetitive at some places, I would recommend it highly, if you are starting …