Mercurial > hg > Papers > 2010 > jsst-kazz

changeset 14:5fc8dbf19071

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add tcp nodelay
author kazz <kazz@cr.ie.u-ryukyu.ac.jp>
date Fri, 27 Aug 2010 22:44:15 +0900
parents 42bea7b0a8f6
children 3deb8b13b83c
files paper/jsst-kazz.pdf paper/jsst-kazz.tex paper/pic/tcpnodelay.eps
diffstat 3 files changed, 679 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
Binary file paper/jsst-kazz.pdf has changed
--- a/paper/jsst-kazz.tex	Fri Aug 27 19:42:23 2010 +0900
+++ b/paper/jsst-kazz.tex	Fri Aug 27 22:44:15 2010 +0900
@@ -112,8 +112,8 @@
 
 \begin{figure}[htbp]
 \begin{center}
-\scalebox{0.50}{\includegraphics{./pic/aqua.eps}} % TODO: 重いから最後
-%\scalebox{0.50}{\includegraphics{./pic/fedlinda.eps}}
+%\scalebox{0.50}{\includegraphics{./pic/aqua.eps}} % TODO: 重いから最後
+\scalebox{0.50}{\includegraphics{./pic/fedlinda.eps}}
 \end{center}
 \caption{A,B,C の順に接続すると左から順に画面が接続される。 B の魚は C
  の画面まで移動している。}
@@ -238,7 +238,15 @@
 に通信する必要があった。
 
 \section{評価}
-\subsection{update() API の検証}\label{subsection:updateverification}
+\subsection{update API の検証}\label{subsection:updateverification}
+update() API を \ref{subsection:update} で設計した通りに実装した。
+
+また、 in/out を用いた場合と、 update を用いた場合で時間を比較することに
+した。
+
+それぞれの API で N 回の更新を行う処理時間を2台のクラスタを用いて計測し
+た。(図\ref{fig:updateinout})
+
 \begin{figure}[htbp]
 \begin{center}
 \scalebox{0.50}{\includegraphics{./pic/updateinout.eps}}
@@ -247,9 +255,31 @@
 \label{fig:updateinout}
 \end{figure}
 
+この結果より、 update を用いてタプルを更新した場合と、 in/out を用いてタ
+プルを更新した場合とで、特に差を見ることはできなかった。
 
-\subsection{ツリー型トポロジーによる負荷分散の検証}\label{subsection:treetopologyverification}
+しかし、クライアントのコードを書くときに、 in/out を2つ書くよりも
+update を1つだけ書く方が、書きやすく、読みやすいという点は利点として挙げ
+られる。
+
+\subsection{TCP No Delay の検証}\label{subsection:tcpnodelay}
+TCP No Delay (短いパケットの送信を遅らせる動作の制御フラグ)
+の影響が大きいとの指摘があったので、 Federated Linda でリング型トポロジーを構築し、
+タプルの転送速度の差を検証した。今回、使用したクラスタの台数は46台である。
 
+リングに流したデータには、 4096 Bytes のデータを用い、 100 周したうちの
+平均時間より、 1 周にかかる時間を算出した。(図\ref{fig:tcpnodelay})
+
+\begin{figure}[htbp]
+\begin{center}
+\scalebox{0.50}{\includegraphics{./pic/tcpnodelay.eps}}
+\end{center}
+\caption{TCP No Delay の検証}
+\label{fig:tcpnodelay}
+\end{figure}
+
+この事より、TCP No Delay によって、パフォーマンスに大きな差を得られ
+ることはないことがわかった。
 
 \section{まとめと今後の課題}
 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/paper/pic/tcpnodelay.eps	Fri Aug 27 22:44:15 2010 +0900
@@ -0,0 +1,645 @@
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