From 8c88e22d59a0d2a320706a5fc43e077292535409 Mon Sep 17 00:00:00 2001 From: Arnaud Giersch Date: Thu, 7 Dec 2017 09:50:06 +0100 Subject: [PATCH 1/1] [sharelatex-git-integration Best effort strategy and virtual load for asynchronous iterative load balancing 2017/12/07 09:50:06] --- loba-besteffort/biblio.bib | 65 ++++- .../data/graphs/R1-101-grid-hcube.pdf | Bin 9815 -> 9485 bytes .../data/graphs/R1-101-grid-line.pdf | Bin 9570 -> 9189 bytes .../data/graphs/R1-101-grid-torus.pdf | Bin 9733 -> 9374 bytes .../data/graphs/R1-110-grid-hcube.pdf | Bin 9955 -> 9623 bytes .../data/graphs/R1-110-grid-line.pdf | Bin 9592 -> 9208 bytes .../data/graphs/R1-110-grid-torus.pdf | Bin 9726 -> 9367 bytes .../data/graphs/RN-101-grid-hcube.pdf | Bin 10243 -> 9860 bytes .../data/graphs/RN-101-grid-line.pdf | Bin 9718 -> 9301 bytes .../data/graphs/RN-101-grid-torus.pdf | Bin 9889 -> 9492 bytes .../data/graphs/RN-110-grid-hcube.pdf | Bin 10020 -> 9645 bytes .../data/graphs/RN-110-grid-line.pdf | Bin 9742 -> 9327 bytes .../data/graphs/RN-110-grid-torus.pdf | Bin 9948 -> 9551 bytes loba-besteffort/loba-besteffort.tex | 236 ++++++++++-------- 14 files changed, 201 insertions(+), 100 deletions(-) diff --git a/loba-besteffort/biblio.bib b/loba-besteffort/biblio.bib index 69dd14f..b800291 100644 --- a/loba-besteffort/biblio.bib +++ b/loba-besteffort/biblio.bib @@ -331,4 +331,67 @@ publisher = {Chapman \& Hall/CRC}, series = {Numerical Analysis \& Scientific Computating}, year = 2007, note = {}, -} \ No newline at end of file +} + + + +@article{krishna2013honey, + title={Honey bee behavior inspired load balancing of tasks in cloud computing environments}, + author={Krishna, P Venkata}, + journal={Applied Soft Computing}, + volume={13}, + number={5}, + pages={2292--2303}, + year={2013} +} + +@article{subrata2007artificial, + title={Artificial life techniques for load balancing in computational grids}, + author={Subrata, Riky and Zomaya, Albert Y and Landfeldt, Bjorn}, + journal={Journal of Computer and System Sciences}, + volume={73}, + number={8}, + pages={1176--1190}, + year={2007} +} + +@article{salimi2014task, + title={Task scheduling using NSGA II with fuzzy adaptive operators for computational grids}, + author={Salimi, Reza and Motameni, Homayun and Omranpour, Hesam}, + journal={Journal of Parallel and Distributed Computing}, + volume={74}, + number={5}, + pages={2333--2350}, + year={2014} +} + + + +@article{cao2005grid, + title={Grid load balancing using intelligent agents}, + author={Cao, Junwei and Spooner, Daniel P and Jarvis, Stephen A and Nudd, Graham R}, + journal={Future generation computer systems}, + volume={21}, + number={1}, + pages={135--149}, + year={2005} +} + +@article{shen2014achieving, + title={Achieving dynamic load balancing through mobile agents in small world P2P networks}, + author={Shen, Xiang-Jun and Liu, Lu and Zha, Zheng-Jun and Gu, Pei-Ying and Jiang, Zhong-Qiu and Chen, Ji-Ming and Panneerselvam, John}, + journal={Computer Networks}, + volume={75}, + pages={134--148}, + year={2014} +} + +@article{kwok2004new, + title={A new fuzzy-decision based load balancing system for distributed object computing}, + author={Kwok, Yu-Kwong and Cheung, Lap-Sun}, + journal={Journal of Parallel and Distributed Computing}, + volume={64}, + number={2}, + pages={238--253}, + year={2004} +} diff --git a/loba-besteffort/data/graphs/R1-101-grid-hcube.pdf b/loba-besteffort/data/graphs/R1-101-grid-hcube.pdf index 4426a0a7289c75e688c33b3c2493cb18c441bab2..a9b2b0863675311679c8e2aad63f5301a1961165 100644 GIT binary patch delta 6376 zcmb7obx;*d-?ns19zvu$Prxa$kfzyTAF(X(eb7^XMt5h=4_*Da3LZZI5*r)$@ZZ zfYe9jD$k3tdqG>c%3;csOT`}T(ul0=`*A$Rp~D8Um9Ev zpb6p!F?*Z)Mqh(#c0EPWJguviHHxTo+gSyIWih=b$c1wyYUR9N5hXNsEAXtd?+ydV zy=jUh(y9C`dPHJb!eE=thsy>|OTW7NQj zJ0*oPifVpc2=#2X+J!G$NyUY3s^z2Q3Tx#KVTzK9Io$&-o_Ef8)hx0RT`^-VeDD7AL&-ZOkI?R)AW9+R#3AqlHE?rN7Fd#RlU_#<0!u^I>(-F z%liUUIk^Y~^{}Tg5sTWQF-2E~z1kV2n@tse(J+%A_9#p(-e1|^-B-Q1m+Zx_E-JP)cuRDRb=);2Ty 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-\newcommand{\makhoul}{\emph{naive}} +\newcommand{\makhoul}{\emph{Bertsekas and Tsitsiklis}} \begin{document} @@ -219,8 +219,7 @@ both single and multiple task assignment problem. An online stochastic dual grad In~\cite{tripathi2017non} a LB algorithm based on game theory is proposed for distributed data centers. The authors formulate the LB problem as a non-cooperative game among front-end proxy servers and characterize the structure of Nash equilibrium. Based on the obtained Nash equilibrium structure, they derive a LB algorithm for computing the Nash equilibrium. They show through simulations that the proposed algorithm ensures fairness among the users and good average latency across all client regions. A hybrid task scheduling and load balancing dependent and independent tasks for master-slaves platforms is addressed in~In~\cite{liu2017dems}. To minimize the response time of the submitted jobs, the proposed algorithm which is called DeMS is splitted in three stages: i) communication overhead reduction between masters and slaves, ii) task migration to keep the workload balanced iii) and precedence task graphs partitioning. - -In~\cite{GrosuC05}, the authors formulate the load balancing problem as a non-cooperative game among users. They use the Nash equilibrium as the solution of this game to optimize the response time of all jobs in the entire system. The proposed scheme guarantees the optimal task allocation for each user with low time complexity. A game theoretic approach to tackle the static load balancing problem is also investigated in~\cite{PenmatsaC11}. To provide fairness to all users in the system, the load balancing problem is formulated as a non-cooperative game among the users to minimize the response time of the submitted users' jobs. As in~\cite{GrosuC05}, the authors use the concept of Nash equilibrium as the solution of a non-cooperative game. Simulations results show that the proposed scheme perform near optimal solutions compared to other existing techniques in terms of fairness. +Several LB techniques based on artificial intelligence have been also proposed in the literature: genetic algorithm (GA) \cite{subrata2007artificial}, honey bee behavior \cite{krishna2013honey, kwok2004new}, tabu search \cite{subrata2007artificial} and fuzzy logic \cite{salimi2014task}. The main strength of these techniques comes from their ability to seek in large search spaces, which arises in many combinatorial optimization problems. For instance, the works in~\cite{cao2005grid, shen2014achieving} have been proposed to tackle the load balancing problem using the multiagent approach where each agent is responsible for load balancing for a subset of nodes in the network. The agent objective is to minimize jobs' response time and host idle time dynamically. In~\cite{GrosuC05}, the authors formulate the load balancing problem as a non-cooperative game among users. They use the Nash equilibrium as the solution of this game to optimize the response time of all jobs in the entire system. The proposed scheme guarantees the optimal task allocation for each user with low time complexity. A game theoretic approach to tackle the static load balancing problem is also investigated in~\cite{PenmatsaC11}. To provide fairness to all users in the system, the load balancing problem is formulated as a non-cooperative game among the users to minimize the response time of the submitted users' jobs. As in~\cite{GrosuC05}, the authors use the concept of Nash equilibrium as the solution of a non-cooperative game. Simulations results show that the proposed scheme perform near optimal solutions compared to other existing techniques in terms of fairness. @@ -234,9 +233,7 @@ of processors and $A$ is a set of communication links. The processors are labeled $i = 1,...,n$, and a link between processors $i$ and $j$ is denoted by $(i, j)\in A$. The set of neighbors of processor $i$ is denoted by $V(i)$. %In this work, we consider that -Processors are considered to be homogeneous for the sake of simplicity. -It is easily extendable to the case of heterogeneous platforms -by scaling the processor's load by its computing power~\cite{ElsMonPre02}. +%Processors are considered to be homogeneous for the sake of simplicity. It is easily extendable to the case of heterogeneous platforms by scaling the processor's load by its computing power~\cite{ElsMonPre02}. %In order prove the convergence of asynchronous iterative load balancing %Bertsekas and Tsitsiklis proposed a model %in~\cite{bertsekas+tsitsiklis.1997.parallel}. Here we recall some notations. @@ -295,7 +292,8 @@ Nevertheless, we think that this condition may lead to deadlocks in some cases. For example, if we consider a linear chain graph network of only three processors and that processor $1$ is linked to processor $2$ which is also linked to processor $3$, but processors $1$ and $3$ are not neighbors. %(i.e. a simple chain which 3 processors). -Now consider that we have the following load values at time~$t$: + +\noindent Now consider that we have the following load values at time~$t$: \begin{align*} x_1(t) &= 10 \\ x_2(t) &= 100 \\ @@ -429,7 +427,7 @@ a given prescribed threshold parameter which we call $k$ in Section~\ref{sec.results}. The amount of data to send is then $s_{ij}(t) = (\bar{x} - x^i_j(t))/k$. -\FIXME[check that it's still named $k$ in Sec.~\ref{sec.results}]{} +%\FIXME[check that it's still named $k$ in Sec.~\ref{sec.results}]{} @@ -502,14 +500,16 @@ received yet. \section{Implementation with SimGrid and simulations} \label{sec.simulations} -In order to test and validate our approaches, we wrote a simulator +In order to test and validate our approache, we wrote a simulator using the SimGrid framework~\cite{simgrid.web,casanova+giersch+legrand+al.2014.simgrid}. This simulator, which consists of about 2,700 lines of C++, allows to run the different load-balancing strategies under various parameters, such as the initial distribution of load, the interconnection topology, the characteristics of the running platform, etc. Then several metrics -are issued that permit to compare the strategies. +were considered to assess and compare the behavior of the different +%are issued that permit to compare the +strategies. The simulation model is detailed in the next section (\ref{sec.model}), and the experimental contexts are described in section~\ref{sec.exp-context}. Then the @@ -519,22 +519,21 @@ results of the simulations are presented in section~\ref{sec.results}. \label{sec.model} In the simulation model the processors exchange messages which are of -two kinds. First, there are \emph{control messages} which only carry -information that is exchanged between the processors, such as the +two types. First, there are \emph{control messages} which carry only the information exchanged between processors, such as the current load, or the virtual load transfers if this option is -selected. These messages are rather small, and their size is +considered. These messages are rather small, and their size is constant. Then, there are \emph{data messages} that carry the real -load transferred between the processors. The size of a data message +load transferred between processors. The size of a data message is a function of the amount of load that it carries, and it can be pretty large. In order to receive the messages, each processor has -two receiving channels, one for each kind of messages. Finally, when -a message is sent or received, this is done by using the non-blocking +two receiving channels, one for each type of messages. Finally, when +a message is sent or received, this is done by using non-blocking primitives of SimGrid\footnote{That are \texttt{MSG\_task\_isend()}, and \texttt{MSG\_task\_irecv()}.}. During the simulation, each processor concurrently runs three threads: a \emph{receiving thread}, a \emph{computing thread}, and a -\emph{load-balancing thread}, which we will briefly describe now. +\emph{load-balancing thread}, which we will briefly describe hereafter. For the sake of simplicity, a few details were voluntary omitted from these descriptions. For an exhaustive presentation, we refer to the @@ -549,10 +548,10 @@ available at \subsubsection{Receiving thread} -The receiving thread is in charge of waiting for messages to come, either on the +The receiving thread is in charge of waiting for incoming messages, either on the control channel, or on the data channel. Its behavior is sketched by Algorithm~\ref{algo.recv}. When a message is received, it is pushed in a buffer -of received message, to be later consumed by one of the other threads. There +of received messages, to be later consumed by one of the other threads. There are two such buffers, one for the control messages, and one for the data messages. The buffers are implemented with a lock-free FIFO \cite{sutter.2008.writing} to avoid contention between the threads. @@ -581,13 +580,13 @@ messages. The buffers are implemented with a lock-free FIFO \subsubsection{Computing thread} -The computing thread is in charge of the real load management. As exposed in +The computing thread is in charge of the real load management. As outlined in Algorithm~\ref{algo.comp}, it iteratively runs the following operations: \begin{itemize} \item if some load was received from the neighbors, get it; \item if there is some load to send to the neighbors, send it; -\item run some computations, whose duration is function of the current - load of the processor. +\item run some computations, whose duration is a function of the processor's current + load. \end{itemize} Practically, after the computation, the computing thread waits for a small amount of time if the iterations are looping too fast (for @@ -629,8 +628,8 @@ iteratively runs the following operations: \begin{itemize} \item get the control messages that were received from the neighbors; \item run the load-balancing algorithm; -\item send control messages to the neighbors, to inform them of the - processor's current load, and possibly of virtual load transfers; +\item send control messages to the neighbors, to inform them about the + processor's current load, and possibly the future virtual load transfers; \item wait a minimum (configurable) amount of time, to avoid to iterate too fast. \end{itemize} @@ -659,16 +658,16 @@ iteratively runs the following operations: \subsection{Experimental contexts} \label{sec.exp-context} -In order to assess the performances of our algorithms, simulations with various parameters have been achieved out, and several metrics are described in this section. +In order to assess the performances of our algorithm, simulations with various parameters have been achieved out, and several metrics are described in this section. \subsubsection{Load balancing strategies} Several load balancing strategies were compared. Experiments with -the \besteffort{}, and with the \makhoul{} strategies have been performed. \emph{Best - effort} was tested with parameter $k = 1$, $k = 2$, and $k = 4$. Secondly, +the \besteffort{}, and with the \makhoul{} strategies have been performed. First the \emph{best + effort} was tested with parameter $k = 1$, $k = 2$, and $k = 4$. Then, each strategy was run in its two variants: with, and without the management of \emph{virtual load}. Finally, each configuration with \emph{real}, -and with \emph{integer} load is considered. +and with \emph{integer} load values is considered. To summarize the different load balancing strategies, we have: \begin{description} @@ -682,9 +681,10 @@ To summarize the different load balancing strategies, we have: \subsubsection{End of the simulation} -The simulations were run until the load was nearly balanced among the -participating nodes. More precisely the simulation stops when each node holds -an amount of load at less than 1\% of the load average. +The simulations were run until reaching the global equilibrium threshold. +%the load was nearly balanced among the participating nodes. +More precisely the simulation stops when each node holds +an amount of load at least less than 1\% of the load average. %, during an arbitrary %number of computing iterations (2000 in our case). @@ -709,35 +709,39 @@ an amount of load at less than 1\% of the load average. %of 125~MB/s, with a latency of 50~$\mu$s. The backbone has a network bandwidth %of 2.25~GB/s, with a latency of 500~$\mu$s. -In order to make our experiments, an heterogeneous platform descriptions were created by taking a subset of the +In order to make our experiments, an heterogeneous grid platform descriptions were created by taking a subset of the Grid'5000 infrastructure\footnote{Grid'5000 is a French large scale experimental Grid (see \url{https://www.grid5000.fr/}).}, as described in the platform file \texttt{g5k.xml} distributed with SimGrid. Note that the heterogeneity of the -platform here only comes from the network topology. Indeed, since our -algorithms currently do not handle heterogeneous computing resources, the +platform here only comes from the network topology. Indeed, +processors are considered to be homogeneous for the sake of simplicity. +It is easily extendable to the case of heterogeneous platforms +by scaling the processor's load by its computing power~\cite{ElsMonPre02}. +%since our +%algorithms currently do not handle heterogeneous computing resources, + The processor speeds were normalized, and we arbitrarily chose to fix them to -1~GFlop/s. - -Then each kind of platform with four different numbers of computing +1~GFlop/s. Each type of platform with four different numbers of computing nodes: 16, 64, 256, and 1024 nodes is built in a similar way. \subsubsection{Configurations} The distributed processes of the application were then logically organized along -three possible topologies: a line, a torus or an hypercube. Tests were performed with the total load initially on only one node (at one end for the line topology). -Other tests for which the load was initially randomly distributed across all the -participating nodes are also considered. The total amount of load was fixed to a number of load +three possible typologies: a line, a torus or an hypercube. Tests were divided into two groups on the basis of the initial distribution of the global load: i) +Tests were performed with the total load initially on only one node%(at one end for the line topology) +, ii) and other tests for which the load was initially randomly distributed across all the +participating nodes of the platform. The total amount of load was fixed to a number of load units equal to 1000 times the number of node. The average load is then of 1000 load units. For all the previous configurations, the computation and communication costs of a load unit are defined. We chose them, such as to -have three different computation over communication cost ratios, and hence model -three different kinds of applications: +have two different computation to communication ratios (CCR), and hence characterize +two different types of applications: \begin{itemize} -\item mainly communicating, with a computation/communication cost ratio of $1/10$; -\item mainly computing, with a computation/communication cost ratio of $10/1$ ; -\item balanced, with a computation/communication cost ratio of $1/1$. +\item mainly communicating, with a CCR of $1/10$; +\item mainly computing, with a CCR of $10/1$. +%\item balanced, with a computation/communication cost ratio of $1/1$. \end{itemize} % To summarize the various configurations, we have: @@ -761,16 +765,14 @@ three different kinds of applications: \subsubsection{Metrics} \label{sec.metrics} -In order to evaluate and compare the different load balancing strategies we define several metrics. Our goal, when choosing these metrics, is to have +In order to evaluate and compare the different load balancing strategies, several metrics were considered. Our goal, when choosing these metrics, is to have something tending to a constant value, i.e. to have a measure which is not changing anymore once the convergence state is reached. Moreover, we want to have some normalized value, in order to be able to compare them across different -settings. - -With these constraints in mind, we define the following metrics: +settings. With these constraints in mind, we define the following metrics: % \begin{description} -\item[\textbf{average idle time:}] that is the total time spent, when the nodes +\item[\it{average idle time:}] that is the total time spent, when the nodes do not hold any share of load, and thus have nothing to compute. %This total %time is divided by the number of participating nodes, such as to have a number @@ -779,12 +781,12 @@ With these constraints in mind, we define the following metrics: %diffuse the load quickly. A smaller value is better. -\item[\textbf{average convergence time:}] that is the average of the times when - all nodes reached the convergence state. Times are measured as a number - of (simulated) seconds since the beginning of the simulation. +\item[\it{average convergence time:}] that is the average of the times when + all nodes reached the final balanced load distribution. Times are measured as a number + of (simulated) seconds from the beginning of the simulation. -\item[\textbf{maximum convergence time:}] that is the time when the last node - reached the convergence state. +\item[\it{maximum convergence time:}] that is the time when the last node + reached the final stable equilibrium. %These two dates give an idea of the time needed by the strategy to reach the %equilibrium state. A smaller value is better. @@ -833,7 +835,7 @@ and our observations are explained. \includegraphics[width=.5\linewidth]{data/graphs/R1-1:10-grid-torus} \includegraphics[width=.5\linewidth]{data/graphs/R1-10:1-grid-hcube}% \includegraphics[width=.5\linewidth]{data/graphs/R1-1:10-grid-hcube} - \caption{Real mode, initially on an only mode, comp/comm cost ratio = $10/1$ (left), or $1/10$ (right). For each bar, from bottom to top, the first part represents the average idle + \caption{Real mode, initially on an only mode, CCR = $10/1$ (left), or $1/10$ (right). For each bar, from bottom to top starting at $t=0$, the first part represents the average idle time, the second part represents the average convergence time, and then the third part represents the maximum convergence time.} \label{fig.results1} \end{figure*} @@ -846,31 +848,32 @@ time, the second part represents the average convergence time, and then the thir \includegraphics[width=.5\linewidth]{data/graphs/RN-1:10-grid-torus} \includegraphics[width=.5\linewidth]{data/graphs/RN-10:1-grid-hcube}% \includegraphics[width=.5\linewidth]{data/graphs/RN-1:10-grid-hcube} - \caption{Real mode, random initial distribution, comp/comm cost ratio = $10/1$ (left), or $1/10$ (right).} + \caption{Real mode, random initial distribution, CCR = $10/1$ (left), or $1/10$ (right).} \label{fig.resultsN} \end{figure*} -The main results for our simulations on grid platforms are presented on Figures~\ref{fig.results1} and~\ref{fig.resultsN}. +The main results for our simulations on grid platforms are presented in Figures~\ref{fig.results1} and~\ref{fig.resultsN}. % -The results on Figure~\ref{fig.results1} are when the load to balance is -initially on an only node, while the results on Figure~\ref{fig.resultsN} are +The results in Figure~\ref{fig.results1} are when the load to balance is +initially on only one node, while the results in Figure~\ref{fig.resultsN} are when the load to balance is initially randomly distributed over all nodes. -On both figures, the computation/communication cost ratio is $10/1$ on the left -column, and $1/10$ on the right column. With a computation/communication cost -ratio of $1/1$ the results are just between these two extrema, and definitely -don not give additional information, so we chose not to show them here. +On both figures, the CCR is $10/1$ on the left +column, and $1/10$ on the right column. %With a computation/communication cost +%ratio of $1/1$ the results are just between these two extrema, and definitely +%don not give additional information, so we chose not to show them here. -On each of the figures~\ref{fig.results1} and~\ref{fig.resultsN}, the results +On each of Figures~\ref{fig.results1} and~\ref{fig.resultsN}, the results are given for the process topology being, from top to bottom, a line, a torus or an hypercube. -Finally, on the graphs, the vertical bars show the measured times for each of -the algorithms. These measured times are, from bottom to top, the average idle +Finally, the vertical bars show the measured times for the evaluated metrics +%each of the algorithms +. These measured times are, starting at $t=0$ and from bottom to top, the average idle time, the average convergence time, and the maximum convergence time (see Section~\ref{sec.metrics}). The measurements are repeated for the different platform sizes. Some bars are missing, especially for large platforms. This is -either because the algorithm did not reach the convergence state in the +because the algorithm did not reach the convergence state in the allocated time. @@ -878,21 +881,26 @@ allocated time. \subsubsection{The \besteffort{} and \makhoul{} strategies without virtual load} -Before looking at the different variations, we will first show that the plain +The {\it simple} ({\it plain}) version of each strategy is defined as the load balancing +algorithm without virtual load's transfers. For each algorithm, we compare the simple +version (without virtual load) and the improved one (with virtual load). +Each algorithm is evaluated in terms of achieved idle time and convergence time. + +Before looking at the different variations, we will first show that the simple \besteffort{} strategy is valuable, and may be as good as the \makhoul{} strategy. On Figures~\ref{fig.results1} and~\ref{fig.resultsN}, these strategies are respectively labeled ``b'' and ``a''. We can see that the relative performance of these strategies is mainly -influenced by the application topology. It is for the line topology that the +influenced by the application topology structure. It is for the line topology that the difference is the more important. In this case, the \besteffort{} strategy is -nearly faster than the \makhoul{} strategy. This can be explained by the +readily faster than the \makhoul{} strategy. This can be explained by the fact that the \besteffort{} strategy tries to distribute the load fairly between -all the nodes and with the line topology, it is easy to load balance the load -fairly. +all the nodes and are in a good agreement with the line topology since it is easy +to load balance the load efficiently. -On the contrary, for the hypercube topology, the \besteffort{} strategy performs -worse than the \makhoul{} strategy. In this case, the \makhoul{} strategy which +In contrast, for the hypercube topology, the \besteffort{}' performances are lower than +the \makhoul{} strategy. In this case, the \makhoul{} strategy which tries to give more load to few neighbors reaches the equilibrium faster. For the torus topology, for which the number of links is between the line and @@ -901,30 +909,54 @@ more nuanced when the initial load is only on one node. The only case where the \makhoul{} strategy is really faster than the \besteffort{} strategy is with the random initial distribution when the communication are slow. -Globally the number of interconnection is very important. The more +Generally speaking, the number of interconnection is very important. Indeed, the more the interconnection links are, the faster the \makhoul{} strategy is because it distributes quickly significant amount of load, even if this is unfair, between -all the neighbors. In opposition, the \besteffort{} strategy distributes the -load fairly so this strategy is better for low connected strategy. - +all the neighbors. However, the \besteffort{} strategy distributes the +load fairly when needed and is is better for sparse connected applications. -\subsubsection{Virtual load} -The influence of virtual load is most of the time really significant compared to -the same configuration without it. Sometimes it has no effect but, based on our observations, it has never a negative effect on the load balancing we tested. +\subsubsection{With virtual load} -On Figure~\ref{fig.results1}, when the load is initially on one node, it can be +The impact of virtual load scheme is most of the time really significant compared to +the simple version of the algorithm with the same configuration. %Sometimes it has no effect but, based on our observations, it has never a negative effect on the load balancing we tested. +For instance, as can be seen from Figure~\ref{fig.results1}, when the load is initially on one node, it can be noticed that the average idle times are generally longer with the virtual load -than without it. This can be explained by the fact that, with virtual load, +than the simple version. This can be explained by the fact that, with virtual load, processors will exchange all the load they need to exchange as soon as the -virtual load has been balanced between all the processors. So consequently they +virtual load has been balanced between all the processors. As a consequence, they cannot compute at the beginning. This is especially noticeable when the -communication are slow (on the left part of Figure ~\ref{fig.results1}. +communication are slow (on the left part of Figure ~\ref{fig.results1}). + +\smallskip +When the load to balance is initially randomly distributed over all nodes, we can see from Figure \ref{fig.resultsN} that the effect of virtual load is not significant for the line topology structure. However, for both torus and hypercube structures with CCR = 1/10 (on the left of the figure), the performance of virtual load transfers is significantly better. This is explained by the fact +that for small CCR values, high communication costs plays quite a significant role. However, the impact of +communication becomes less important as the CCR values increases, since larger CCR values result in smaller communication times. We also tested the impact of CCR values on the performance of each algorithm in terms of idle times. From Figures~\ref{fig.results1} and ~\ref{fig.resultsN} we can find that our virtual load scheme achieves +a really good average idle times, which is quite close to both its own simple version and its direct competitor {\it Bertsekas and Tsitsiklis} algorithm. As expected, for coarse grain applications (CCR =10/1), idle times are close to 0 since processors are inactive the most of times compared to fine grain applications. + +\smallskip +Taken as a whole, the results illustrated in Figures~\ref{fig.results1} and ~\ref{fig.resultsN} clearly show that our proposal outperforms the Betsekas and Tsistlikis algorithm. +These results indicate that local load balancing decisions has a significant impact on the global +convergence time achieved by the compared strategies. This is because, upon load imbalance detection, assigning an amount of load in an unfair way between neighbors will severely increase the total number of iterations required by the algorithm before reaching the final stable distributions. The reason of the poorer performance of {\it Bertsekas and tsistsilikis} algorithm can be explained by the inconvenience of the iterative load balance policy adopted for load distribution between neighbors. Neighbors are selected in such a way that the {\it ping-pong} condition holds. Doing so, loads are not really assigned to processor neighbors which would allow them to be fairly balanced. + +\smallskip +Unlike {\it Betsekas and Tsistlikis} algorithm, our approach is not really sensitive when +we deal with realistic models of computation and communication. This is due to two main features: i) the use of "virtual load" transfers winch allows nodes to predict the load they receive in the subsequent iterations steps, ii) and the greedy neighbors selection adopted by our algorithm at each time step in the load balancing process. The involved neighbors are selected in such a way that load difference between the computational resources is minimized as low as possible. -On Figure \ref{fig.resultsN} when the load to balance is initially randomly distributed over all nodes, we can see that the effect of virtual load is not significant for the line. For the torus with the mainly communicating case (on the left of the figure), the effect of the virtual load is very significant. For the hypercube, in any case, the effect of the virtual load is visible. It is more visible when communications have a more important role (i.e. with the mainly communicating case). +\smallskip +Comparing the results of the extended version (with virtual load) to the results of the simple one, we observe in Figs.~\ref{fig.results1} and ~\ref{fig.resultsN} that the improved version gives the best performances. It always improves both convergence and idle times significantly in all figures. This is because, with virtual load transfers, the algorithm seeks greedily to ensure a certain degree of load balancing for processors by taking into account the information about the predictive loads not received yet. Consequently, this leads to optimize the final convergence time of the load balancing process. Similarly, the extended version achieves much better results than the simple one when considering larger platforms, as shown in Figs.~\ref{fig.results1} and ~\ref{fig.resultsN}. + +\smallskip +We also find in Figs.~\ref{fig.results1} and ~\ref{fig.resultsN} that the performance difference between the improved version of our proposal and its simple version (without virtual load) increases when the CCR increases. This interesting result comes from the fact that larger CCR values reveals that we are dealing with intensive computations applications in grid platforms. Thus, in order to reduce the convergence time of the load balancing for such applications, it is important to take suitable decisions upon local load imbalance detection. That is why we added {\it virtual load} transfers scheme to the {\it best effort} strategy to perfectly balance the load of processors at each step of the load balancing process. + +\smallskip +Finally, it is worthwhile noting from Figures~\ref{fig.results1} and ~\ref{fig.resultsN}, that the algorithm's convergence time increases together with network's size. We also see that the idle time increases together with the size of the network when a load is initially on a single node (Figure~\ref{fig.results1}), +as expected. In addition, it is interesting to note that when the number of nodes increases, there is not substantial difference in the increase of the convergence time, compared to the simple version without virtual load. This is explained by the fact that the increase in the convergence time is already absorbed by the virtual load transfers between processors being in line with the network's size. + +%For the hypercube, in any case, the effect of the virtual load is visible. It is more visible when communications have a more important role (i.e. with the mainly communicating case). %Dans ce cas légère amélioration de la cvg. max. Temps moyen de cvg. amélioré, @@ -951,27 +983,33 @@ On Figure \ref{fig.resultsN} when the load to balance is initially randomly dist As explained previously when the communication are slow the \besteffort{} strategy is efficient. This is due to the fact that it tries to balance the load fairly and consequently a significant amount of the load is transferred between -processors. In this situation, it is possible to reduce the convergence time by +processors. In this case, it is possible to reduce the convergence time by using the leveler parameter (parameter $k$). The advantage of using this solution is particularly efficient when the initial load is randomly distributed on the nodes with torus and hypercube topologies and slow communication. When -virtual load mechanism is used, the effect of this parameter is also visible -with the same condition. However, sometimes this parameter may have a negative effect on the convergence time. - +virtual load scheme is used, the effect of this parameter is also perceptible +with the same conditions. %However, sometimes this parameter may have a negative effect on the convergence time. -\subsubsection{With integer load} -We also performed some experiments with integer load instead of load with real -value. In this case, the results have globally the same behavior, that is why we decided not to show similar figures. The most +\subsubsection{With non negative integer load values} +In addition to the first tests devoted to the case of non negative real load values, we also carried out further experiments with integer load values to assess the performance of our proposal. +%We also performed some experiments with integer load instead of load with real +%number values. +As expected, +%In this case, +the obtained results have globally the same behavior, that is why we decided not to show similar figures. The most interesting result, from our point of view, is that the virtual mode allows -processors in a line topology to converge to the uniform load balancing. Without +processors in a line topology to converge to the uniform load balancing state. Without the virtual load, most of the time, processors converge to what we call the -``stairway effect'', that is to say that there is only a difference of one in -the load of each processor and its neighbors (for example with 10 processors, we +``stairway effect'', that is to say that there is only a difference of at most one unit load between any pairs of neighbor nodes, i.e. the load difference between each processor and its neighbors is within one unit load (for example with 10 processors, we obtain 10 9 8 7 6 6 7 8 9 10 instead of 8 8 8 8 8 8 8 8 8 8). +\smallskip +To summarize and broadly speaking, the simulation results led us to show that, with few exceptions (without virtual load), our proposal is superior to the {\it Bertsekas and Tsiltsikis} algorithm in all the tested scenarios. The illustrated results indicate that network size, CCR values and initial load distribution have a significant impact on the algorithm's performances. Thus, this experimental study corroborate the usefulness of our algorithm, and confirms that when dealing with realistic model platforms, both {\it best effort} strategy and {\it virtual load} transfers play an important role on the achieved idle and convergence times. + + %Cas normal, ligne -> converge pas (effet d'escalier). %Avec vload, ça converge. @@ -1028,10 +1066,10 @@ obtain 10 9 8 7 6 6 7 8 9 10 instead of 8 8 8 8 8 8 8 8 8 8). In this paper, we have presented a new asynchronous load balancing algorithm for non negative real numbers of divisible loads in distributed systems. The proposed algorithm which is called {\it best effort strategy} -seeks greedily for loads imbalance detection and tries to achieve efficient local equilibrium threshold +seeks greedily for loads imbalance detection and tries to achieve efficient local load equilibrium between neighbors. Our proposal is based on {\it a clairvoyant virtual loads' transfer} scheme which allows nodes to predict the future loads they will receive in the subsequent iterations. This leads to a noticeable speedup of the global convergence time of the load balancing process. -Based on SimGrid simulator, we have demonstrated that, when we deal with realistic models of computation and communication, our algorithm exhibits better performances than its direct competitors from the literature. This makes it a viable choice for load balancing of both non negative real and integer divisible loads in distributed computing systems. % un peu gonflé peut être pour la dernière phrase. +Based on SimGrid simulator, we have demonstrated that, when we deal with realistic models of computation and communication, our algorithm exhibits better performances than its direct competitor from the literature. This makes it a viable choice for load balancing of both non negative real and integer divisible loads in distributed computing systems. % un peu gonflé peut être pour la dernière phrase. \section*{Acknowledgments} -- 2.39.5