Henri van den Bulk edited Problem 2.tex  over 9 years ago

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\section{Problem 2}  When comparing two processors designs we'll have to make assumptions so that we can make an equal comparison. In this problem we have two processor options one processor that executes at \textit{1Ghz} with and average CPI of 1.2 and a processor that executes at \textit{2Ghz} and has a CPI of 2.  To compare two processors we typically would have to compare cost, performance and energy/power consumption. These three factors will have different weights bepending on the intended use of the processor. For example, energy has a hight weight in a decission if the intended use is for a mobile device.  

Based on the problem provided not enough details around cost, energy and intended use are provided. As such perfomance is left in making a comparison. To make this comparison we'll leverage the Performance Equation. \begin{displaymath}{L = IC*CPI*CT}\end{displaymath}  \begin{definition}  We can assume that the workload between processors is the same which means that $IC$ is contant, which leaves us with $CPI$ and $CT$.: \begin{displaymath}{L = CPI*CT}\end{displaymath}  \end{definition} Given that we're given frequency in Ghz we'll change $CT$, which is clock cycles in seconds, to clock speed. This means our equation will change to \begin{math}L = CPI/f\end{math}