Papers/2014/nobuyasu-master: paper/chapter5.tex annotate

annotate paper/chapter5.tex @ 102:6f73e05d5024

Fixed chapter4.tex

author	Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date	Sat, 15 Feb 2014 06:00:54 +0900
parents	4e8bfd65768f
children	aed0bf04bdfb

rev	line source
70 26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	1 \chapter{分散木構造データーベース Jungle の評価}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	2 前章ではJungleにおける分散データベースの詳細な実装について述べた.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	3 本章では実装を行ったJungleに対してCassandraとの性能比較を行い評価をする.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	4 性能比較の為に簡易な掲示板プログラムをJungleとCassandra それぞれに作成した.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	5 複数のノードに繋がっている状態においても性能を測りたいため, 学科が提供する
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	6 VMWareの並列環境を利用する. また, 我々の研究室が利用しているブレードサーバ
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	7 上で動いているKVMもクライアントとして利用する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	8 Jungleは永続性はなく分散だけ実装で測定を行っている.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	9
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	10 \section{実験方法}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	11 実験は同じ機能を提供している簡易掲示板プログラムをJungleとCassandraそれぞれで
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	12 動かし, HTTPリクエストにより負荷をかけて行う.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	13 レスポンスが返ってくるまでの時間をはかり, 平均時間と標準偏差を求めグラフに出力する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	14
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	15 また, 実験は2つ行う.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	16 まず行う実験は, 複数のクライアントから1つのノードに負荷をかける方法である.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	17
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	18 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	19 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	20 \includegraphics[scale=0.70]{figures/cluster_request_server.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	21 \caption{実験1 複数のクライアントからサーバ1台への負荷}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	22 \label{fig:clients_singleserver}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	23 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	24 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	25
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	26
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	27
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	28 次に行う実験は複数のノードに対し複数のクライアントから負荷をかける方法である.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	29 それぞれ大量のHTTPリクエストをだし, 全てのリクエストの処理にかかる時間を測定する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	30
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	31 クライアントの数に比例してノードを増やすことでレスポンスを維持できるか
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	32 スケーラビリティを調べるためである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	33 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	34 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	35 \includegraphics[scale=0.70]{figures/clients_request_servers.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	36 \caption{実験2 複数のクライアントから複数のノードへの負荷}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	37 \label{fig:clients_servers}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	38 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	39 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	40
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	41 \subsection{Torque Resource Manager}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	42 並列環境下にあるマシン全てに命令を出し, タスクを実行させることは非常に大変である.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	43 そのため, 今回の実験において並列環境のマシンに同時にタスクを実行させるために
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	44 Torque Resrouce Managerを利用する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	45 Torque はQueueによりタスクの実行順序を制御する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	46 Queueにタスクをいれる際には, そのタスクをいくつのノードで
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	47 実行するか, いくつのコア数を使用するかといったリソースの設定も行うことができる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	48
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	49
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	50 \subsection{weighttp}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	51 最初の実験で1つのノードに負荷をかけるプログラムはウェブサーバの測定ツールであるweighttpを使用する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	52 weighttpは総リクエスト数, 同時接続数, ネイティブスレッド数をオプションとして指定することができるC言語
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	53 でかかれたプログラムである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	54
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	55
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	56 \subsection{掲示板プログラム}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	57 今回使用する掲示板プログラムは組み込み用ウェブサーバであるJettyをフロントエンドとして利用し, バックエンド
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	58 に Jungle と Cassandra を利用している.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	59
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	60 \begin{table}[!htbp]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	61 \caption{簡易掲示板システムで利用したJettyとCassandraのバージョン}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	62 \label{tab:bulletinboard_components}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	63 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	64 \begin{tabular}{\|c\|\|c\|} \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	65 名前 & バージョン \\ \hline \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	66 Jetty & 6.1.26 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	67 Cassandra & 2.0.4 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	68 \end{tabular}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	69 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	70 \end{table}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	71
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	72
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	73
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	74 \subsection{実験環境}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	75
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	76 \subsubsection{サーバノードとクライアントを実行させるサーバの仕様}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	77 使用するVMWareとKVMのクラスタの使用を以下に示す.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	78 クラスタは仕様を表\ref{tab:cluster_spec_vmware}と表\ref{tab:cluster_spec_kvm}に示す.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	79
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	80 \begin{table}[!htbp]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	81 \caption{掲示板プログラムを実行させるVMWareクラスタの仕様（クライアントにも利用）}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	82 \label{tab:cluster_spec_vmware}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	83 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	84 \begin{tabular}{\|c\|\|c\|} \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	85 名前 & 概要 \\ \hline \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	86 CPU & Intel(R) Xeon(R) CPU X5650@2.67GHz \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	87 Memory & 8GB \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	88 OS & CentOS 5.8 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	89 HyperVisor & VMWare ESXi \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	90 JavaVM & Java(TM) SE Runtime Environment (build 1.7.0-b147) \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	91 \end{tabular}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	92 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	93 \end{table}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	94
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	95 \begin{table}[!htbp]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	96 \caption{クライアントを実行させるKVMクラスタの仕様}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	97 \label{tab:cluster_spec_kvm}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	98 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	99 \begin{tabular}{\|c\|\|c\|} \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	100 名前 & 概要 \\ \hline \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	101 CPU & Intel(R) Xeon(R) CPU X5650@2.67GHz \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	102 Memory & 8GB \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	103 OS & CentOS 5.8 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	104 HyperVisor & KVM \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	105 JavaVM & Java(TM) SE Runtime Environment (build 1.7.0-b147) \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	106 \end{tabular}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	107 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	108 \end{table}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	109
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	110 \subsubsection{ブレードサーバの仕様}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	111 最初の実験ではブレードサーバ1台で掲示板プログラムを動かし, 並列環境から複数のクライアント
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	112 で負荷をかける.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	113 ブレードサーバの仕様を表\ref{tab:server_spec_1}に示す
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	114 \begin{table}[!htbp]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	115 \caption{サーバノードとして利用するブレードサーバの使用}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	116 \label{tab:server_spec_1}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	117 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	118 \begin{tabular}{\|c\|\|c\|} \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	119 名前 & 概要 \\ \hline \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	120 CPU & Intel(R) Xeon(R) CPU X5650@2.67GHz \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	121 物理コア数 & 12 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	122 論理コア数 & 24 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	123 Memory & 132GB \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	124 OS & Fedora 16 \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	125 JavaVM & Java(TM) SE Runtime Environment (build 1.7.0\_51-b13) \\ \hline
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	126 \end{tabular}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	127 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	128 \end{table}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	129
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	130 \subsubsection{Jungle実行時のJavaVMのオプションの設定}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	131 サーバでJungleを実行するときは, JavaVMがデフォルトで設定しているHeapサイズの容量を
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	132 大きくする.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	133 Jungleでは非破壊でデータを保持するため, データで使用するメモリの量が大きい.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	134 JavaのHeapサイズをデフォルトのままでベンチマークプログラムを走らせると,
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	135 エラーの\verb\|java.lang.OutOfMemoryError: GC overhead limit exceeded\|が出力されてプログラムが終了してしまう.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	136 このエラーはFull GCにかかる回数が多いか, プログラムの98\%以上GCに使用されていると出力されるエラーである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	137 そのため, ブレードサーバでは\verb\|-Xmx20g -Xms10g\|をつけ, VM側では\verb\|-Xmx6g -Xms4g\|のオプションを付けて行う.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	138
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	139 \subsubsection{サーバの環境}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	140 HTTPによりノードに負荷を掛ける場合気をつけることがある.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	141 それはサーバの設定により最大コネクション数や開くことのできるファイル記述子の数に制限がかかっていることである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	142 この2つの値はデフォルトでは小さなものとなっており, そのままではカーネル
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	143 の設定がネックとなったベンチマーク結果がでる可能性がある.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	144 そこで次のようにコマンドを実行することでコネクション数の制限を増やすことができる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	145 \begin{lstlisting}[frame=lrbt,label=src:maxconn_up,caption=コネクション数を増やす,numbers=left]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	146 % sudo sysctl -w net.core.somaxconn=10000
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	147 \end{lstlisting}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	148 ファイル記述子の制限を増やす場合は次のコマンドを実行する
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	149 \begin{lstlisting}[frame=lrbt,label=src:max_up_filedisc,caption=ファイル記述子の制限を増やす,numbers=left]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	150 % ulimit -n 10000
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	151 \end{lstlisting}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	152
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	153
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	154
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	155 \section{実験結果1}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	156 複数のクライアントからサーバノード一台に対して負荷をかける実験を行った.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	157 クライアントの数は10台から始まり5台ずつ増やしていき, 最大45台まで増える.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	158 各クライアント以下のオプションをつけたweighttpプログラムが実行される.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	159 \begin{lstlisting}[frame=lrbt,label=src:distributed_weighttp_op,caption=weighttpのオプション（実験1）,numbers=left]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	160 weighttp -n 20000 -c 20 -t 2 -k "http://url"
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	161 \end{lstlisting}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	162 このオプションは2つのネイティブスレッドを使用し, 同時に20のコネクションを張り, 通信の間コネクションを切らずに2万件の
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	163 HTTP requestを送信することを表している.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	164 Cassandraはサーバノードが一台の為, Replication factor 1でConsistency LevelはONEとなる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	165
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	166
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	167 実験の結果はグラフ\ref{fig:singlenode_read_bench}, \ref{fig:singlenode_write_bench}となる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	168 横軸はクライアントノードの数を表しており, 値が増えるほどリクエストの数も増え負荷が高まる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	169 縦軸は2万件のリクエスト全てにレスポンスを返し終えた時間を表している（単位：秒）.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	170
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	171 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	172 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	173 \includegraphics[scale=1.0]{figures/bldsv12_read_bench.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	174 \caption{複数のクライアントから一台への負荷}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	175 \label{fig:singlenode_read_bench}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	176 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	177 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	178
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	179 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	180 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	181 \includegraphics[scale=1.0]{figures/bldsv12_write_bench.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	182 \caption{複数のクライアントから一台への負荷}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	183 \label{fig:singlenode_write_bench}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	184 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	185 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	186 \newpage
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	187
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	188 \subsection{実験結果1の考察}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	189 読み込み, 書き込みともにJungleのほうが良い結果となっている.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	190 書き込みの差が大きく開いていることに関しては, Cassandraはディスクへと書きだすとき
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	191 もあるのも原因の1つと考えられる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	192 Jungleはオンメモリであることから, やはり差はでてしまう.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	193 しかしディスクに書き出していないこととは別の要因も考えられる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	194 Jungleは非破壊的木構造なため, ロックをほとんど必要としない.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	195 書き込み時においてもロックが必要なときは木のコピーをとりおえて, ルートノード
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	196 を更新するときのみである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	197 書き込みの速度が早いことはJungleのロックが少ないことも要因の1つとしてあげられる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	198
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	199
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	200 \newpage
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	201 \section{実験結果2}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	202 学科の並列環境クラスタを用いて分散環境下での実験を行う
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	203 学科の提供するVMは48台だが, ブレードサーバ上で動くKVMから12台を利用し, 合計60台を使用する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	204 JungleとCassandraをそれぞれサーバノード10台, 20台, 30台で動かし, クライアントも10台, 20台, 30台
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	205 と増やして負荷をかける.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	206 クライアントとサーバノードの数は1:1となるため, 横軸の値の数が増えると総リクエストは増えても
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	207 1台に与えるリクエスト数は変わらない.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	208 縦軸はリクエストに全てに対してレスポンスを返しきった時間を表す（単位：秒）
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	209 KVM側はクライアント側だけに利用する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	210 weighttpに付ける引数は実験1と同じとする.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	211 各クライアントから2万のリクエストを送る.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	212 CassandraはConsistency Level ONEとQUORUMの両方を計測する.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	213 QUORUMのReplication factorは5で設定してある.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	214
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	215 測定は読み込みと書き込みの両方を行う.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	216 測定の結果をグラフにしたのを図\ref{fig:distributed_read_bench}, \ref{fig:distributed_write_bench}に示す.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	217 横軸はクライアントとサーバノードの数を表す.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	218
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	219
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	220 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	221 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	222 \includegraphics[scale=1.0]{figures/distributed_read_bench.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	223 \caption{分散環境下における読み込みベンチマーク結果}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	224 \label{fig:distributed_read_bench}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	225 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	226 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	227
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	228 \newpage
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	229
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	230 \begin{figure}[htpb]
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	231 \begin{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	232 \includegraphics[scale=1.0]{figures/distributed_write_bench.pdf}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	233 \caption{分散環境下における書き込みベンチマーク結果}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	234 \label{fig:distributed_write_bench}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	235 \end{center}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	236 \end{figure}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	237
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	238
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	239 \subsection{実験結果2の考察}
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	240 こちらも, JungleのほうがCassandraにくらべて良い結果となっている.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	241 %実験1の結果と比べると全体的にデータのあばれが少なくなっている.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	242 %これはクライアントの数が増加してもサーバノードの数も増加するため, サーバノード一台に対する
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	243 %HTTPからの負荷が変わらないためだと考えられる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	244 特に読み込みに関してはConsistentcy Level QUORUMの場合と比べると3倍以上離れている場合もある.
71 4e8bfd65768f Fixed Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: 70 diff changeset	245 実験1に比べてJungleとCassandraの差が開いているのはCassandraのConsistency Level
70 26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	246 がQUORUMに設定されていることが要因の1つとしてあげられる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	247 今回CassandraのReplication factorは5と設定している.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	248 そのため, Consistency LevelがQUORUMの場合は, 書き込みは3つのノードに書き込まれたことを確認
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	249 し, 読み込みは3つのノードからデータを取得して最新のデータを返す為である.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	250 Jungleの結果が横軸の値が増えても横ばいになっていることにも注目したい.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	251 これはJungleの場合, リクエストが来た際に, それぞれのノードがローカルにある木の情報をすぐに
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	252 返すためである.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	253 そのため, クライアントが増え, 総リクエスト数が増加しても一台に対する負荷が増えない限りは
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	254 同じレスポンス速度を維持できる.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	255 %1つ気になる点としては, Cassandraは横軸の値が30のときの結果が25の時に比べて下がっている点である.
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	256
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	257
26bfd74c4c41 Added some files Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> parents: diff changeset	258

Mercurial > hg > Papers > 2014 > nobuyasu-master

annotate paper/chapter5.tex @ 102:6f73e05d5024