results and conclusion

[p2p-kernel-protocol.git] / doc / src / results.tex

diff --git a/doc/src/results.tex b/doc/src/results.tex
index fa18e4f..a08b4fc 100644 (file)
--- a/doc/src/results.tex
+++ b/doc/src/results.tex
@@ -1,43 +1,62 @@
 \section{Results}
 \label{sec:results}
-The results of the tests performed.
+
+We want to view if our implementation is viable in terms of performances. To do this we compare our results with the results of \texttt{sendfile} system call. The \texttt{sendfile} command (\textbf{ssize\_t sendfile(int} \textit{out\_fd,} \textbf{int} \textit{in\_fd,} \textbf{off\_t *}\textit{offset,} \textbf{size\_t} \textit{count}\textbf{);}) is used to send \texttt{count} bytes from \texttt{in\_fd} to \texttt{out\_fd}.
 
 \begin{table}
        \begin{center}
-       \begin{tabular}{| c | c | c | c | c |}
+       \begin{tabular}{| c | c | c | c | c | c |}
                \hline
-               Sent(MB) & Time(s) & Two peers & Tree peers & Six peers \\
+               Sent(MB) & \multicolumn{5}{|c|} {Time}  \\
+               \cline{2-6}
+               & one peer & two peers & tree peers & six peers & eight peers\\
                \hline
-               32 & 4 & 10 & 18 & 49 \\
+               32 & 4 & 10 & 18 & 49 & 61 \\
                \hline
-               64 & 10 & 20 & 35 & 80 \\
+               64 & 10 & 20 & 35 & 80 & 115 \\
                \hline
-               128 & 20 & 42 & 58 & 226 \\
+               128 & 20 & 42 & 58 & 226 & 347\\
                \hline
-               256 & 41 & 75 & 129 & 385 \\
+               256 & 41 & 75 & 129 & 385 & 534 \\
                \hline
        \end{tabular}
        \end{center}
        \caption{Sendfile Results}
-       \label{sendfile_results}
+       \label{sendfile-results}
 \end{table}
 
+In the first test we sent files of 32, 64, 128 and 256 MB from one node to a different number of peers. We varied the number of peers from 1 to 8. The results can be seen in Table \ref{sendfile-results}. We can see that the time needed to send files of different size grows almost linearly, with a factor smaller than 1. This is expected because for each peer we execute a different sendfile system call.
+
+In the second test, we used our peer-to-peer kernel protocol also on files with size growing from 32MB to 256MB. The number of peers used in test was varied from 1 to 8. The results presented in Table \ref{p2pkp-results}, show an almost linear growth of the time needed to send the files from the sender to peers but with a smaller factor than in the case of \texttt{sendfile}. For small number of peers, one two or three, the results were better in the tests made with sendfile, but for a greater number of peers the results are better when using the p2pkp.
+
 \begin{table}
        \begin{center}
-       \begin{tabular}{| c | c | c | c | c |}
+       \begin{tabular}{| c | c | c | c | c | c |}
                \hline
-               Sent(MB) & Time(s) & Two peers & Tree peers & Six peers \\
+               Sent(MB) & \multicolumn{5}{|c|} {Time}  \\
+               \cline{2-6}
+               & one peer & two peers & tree peers & six peers & eight peers\\
                \hline
-               32 & 13 & 29 & 35 & 45 \\
+               32 & 13 & 29 & 35 & 45 & 53 \\
                \hline
-               64 & 34 & 53 & 67 & 103 \\
+               64 & 34 & 53 & 67 & 103 &  125 \\
                \hline
-               128 & 66 & 118 & 142 & 167 \\
+               128 & 66 & 118 & 142 & 167 &  197 \\
                \hline
-               256 & 121 & 223 & 277 & 378 \\
+               256 & 121 & 223 & 277 & 378 & 446 \\
                \hline
        \end{tabular}
        \end{center}
        \caption{P2PKP Results}
-       \label{p2pkp_results}
+       \label{p2pkp-results}
 \end{table}
+
+We also made a graphic shown in Figure \ref{fig:comp} to view more clearly the differences between sendfile and peer-to-peer kernel protocol. As we can see, with the increase of the number of peers p2pkp become more and more good, and finally overcame the performances of sendfile.
+
+\begin{figure}[h!]
+        \centering
+        \includegraphics[scale=0.6]{img/comparison.png}
+        \caption{Comparison}
+        \label{fig:comp}
+\end{figure}
+