evaluation: added introduction text and made plan for additional text

thesis/chapters/evaluation.tex

@@ -1,9 +1,14 @@
 \chapter{Evaluation}
 \label{cha:evaluation}
 
+The aim of this thesis is to determine whether at least one of the GPU evaluators is faster than the current CPU evaluator. This chapter describes the performance evaluation. First, the environment in which the performance tests are performed is explained. Then the individual results for the GPU interpreter and the transpiler are presented. In addition, this part also includes the performance tuning steps taken to achieve these results. Finally, the results of the GPU evaluators are compared to the CPU evaluator in order to answer the research questions of this thesis.
+
 \section{Test environment}
 Explain the hardware used, as well as the actual data (how many expressions, variables etc.)
 
+three scenarios -> few, normal and many variable sets;; expr repetitions to simulate parameter optimisation
+Benchmarktools.jl -> 1000 samples per scenario
+
 \section{Results}
 talk about what we will see now (results only for interpreter, then transpiler and then compared with each other and a CPU interpreter)