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A Survey of Desktop Grid Scheduling SUBMITTED TO IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 1 A Survey of Desktop Grid Scheduling Evgeny Ivashko, Ilya Chernov, and Natalia Nikitina F Abstract—The paper surveys the state of the art of task scheduling in cheaper internet traffic, higher availability of wireless net- Desktop Grid computing systems. We describe the general architecture works, etc. of a Desktop Grid system and the computing model adopted by the To date, there are many middleware systems for Desktop BOINC middleware. We summarize research papers to bring together Grid computing. Even restricting oneself with centralized and examine the optimization criteria and methods proposed by re- systems of the “master-worker” paradigm, one names more searchers so far for improving Desktop Grid task scheduling (assigning tasks to computing nodes by a server). In addition, we review related than ten platforms (BOINC [8], the original SETI@home [6], papers, which address non-regular architectures, like hierarchical and XtremWeb [9], Cosm [10], X-Com [11], Entropia [12], Bayani- peer-to-peer Desktop Grids, as well as Desktop Grids designed for han [2], Javelin [13], HTCondor [14], Grid MP [15], Al- solving interdependent tasks. Finally, we formulate and briefly describe chemi [16] etc.). Decentralized, peer-to-peer and other vari- several open problems in the field of Desktop Grid task scheduling. ations make this list even longer. However, the BOINC plat- form has been developed with the purpose of simplifying Index Terms—C.1.4.d Scheduling and task partitioning, D.4.1.e and unifying creation and operation of DG projects both at Scheduling the enterprise or the Internet level. For the moment, BOINC has succeeded in becoming a de-facto standard and the most 1 INTRODUCTION widely used middleware for DGs and VC. Desktop Grid (DG) is a promising high-throughput com- This is the reason we survey task scheduling in DGs that puting paradigm. It is a form of a distributed computing inherit the key design features presented in BOINC: system that uses idle time of non-dedicated geographically • centralized architecture; distributed computing nodes connected over a low-speed • master-worker computing paradigm; network. This idea is believed to have been first described • PULL work assignment mode. by Litzkow et al. in 1987 [1]. Later on, in 1999, Sarmenta and Hirano introduced the term “volunteer computing” (VC) [2] Today DGs constitute an important part of high- to describe the possibility of almost unlimited scaling the performance computing landscape along with Computa- computational resources constituting DG by means of VC tional Grid systems, computing clusters, and supercomput- power. In 2001, Foster et al. [3] made a clear distinction ers. However, as opposed to these tools, the DG computing between Computational Grids, Enterprise DGs, and VC; paradigm is not so thoroughly studied. The experience of here we follow this distinction. the multitude of successful BOINC projects [17] has uncov- As a practical tool, DG traces its history back to 1996, ered new concerns and problems unique to DGs. when the first large VC project GIMPS [4] was launched, Task scheduling plays a crucial role in DG-based high- followed by another large project distributed.net [5] and throughput computing. It can drastically affect the perfor- the introduction of SETI@home [6] in 1997. Later, in 1999, mance of a DG system. In comparison with Computational SETI@home and Folding@home [7] were launched as the Grids and computing clusters, task scheduling in DGs is first public VC scientific projects. Due to the success of these more complicated because of such factors as hardware and and many other projects (such as ClimatePrediction.net, software heterogeneity, lack of trust, uncertainty on avail- Rosetta@home, Docking@home, Einstein@Home, the IBM ability and reliability of computing nodes, etc. World Community Grid etc., to name a few), DGs have A wide range of algorithms and heuristics has been received growing interest and attraction. In 2002 the group proposed in the literature to address task scheduling chal- that developed SETI@home started the BOINC (Berkeley lenges in DGs. Additional information is gathered and used: Open Infrastructure for Network Computing) project to availability periods, reliability ratings, and so on. The aim of develop a general-purpose open-source VC middleware [8]. this work is to review research papers devoted to optimizing The current growing potential of DGs is connected performance of DGs by scheduling. We bring together and with growing performance of desktop and laptop comput- examine the optimization criteria and methods proposed by ers, their increasing number, faster network connections, researchers so far. Alongside the conventional DGs, special cases of them are considered in the literature: hierarchical, Manuscript received XX.XX.XXXX. peer-to-peer, etc. We also briefly review some related papers, The authors are with the Institute of Applied Mathematical Research, Karelian which address these non-regular architectures. Research Center, Russian Academy of Sciences, Petrozavodsk, Russia. Ilya Chernov is the corresponding author (e-mail: [email protected]). There are several surveys in the domain of DGs (in- Digital Object Identifier XXXXXXXXXX. cluding the task scheduling problem) that have been SUBMITTED TO IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 2 presented by now. They review task scheduling tax- Computational clusters and Computational Grids have onomies [18], heuristic methods [19], and knowledge-based dedicated computing nodes, while DGs do not; this affects algorithms [20], [21], popular middleware systems and the nodes’ availability, reliability, and trust. DGs usually have a factors influencing their performance [22]. We discuss these large number of computing nodes, much larger than Com- works in more detail in Section 3.3. putational clusters or Computational Grids (for the latter In contrast to these surveys, our research is we count the constituting high-performance computing sys- tems as computing nodes and do not address their internal • concentrated on task scheduling optimization criteria structure). This leads to high heterogeneity. Using idle time and methods; of different computing devices of diverse performance, with • comprehensive, as it covers the great majority of various hardware, operational systems, software libraries, research papers in the domain of DG task scheduling; etc., increases heterogeneity even more. Also, the set of • up-to-date, as it covers papers up to 2017. computing nodes is changing in time. A DG can have one or This work provides a survey of DG task scheduling two scheduling levels: the latter happens when a computing research. We consider global scheduling policies describing node shares its resources among several DG applications. the rules of assignment of tasks to computing nodes by a Most of these characteristics also separate DGs from cloud server. We have studied 127 research papers dated from 1999 computing systems (see, e.g., [23]). However, DGs can be to 2017 and related to DG task scheduling. joined with computing clusters [24], Grid systems [25], or The rest of the paper is organized as follows. Section 2 cloud computing systems [26] to establish more complex highlights specifics of the DG concept and BOINC as the and powerful computational platform. most commonly used middleware for DGs. Section 3 gives All these characteristics illustrate high scheduling com- an analysis of BOINC task scheduling research papers. plexity of DGs in comparison with two other conventional We describe our research objects, overview the problems, computational paradigms, computational clusters and Com- optimization criteria, methods, and results achieved by re- putational Grids. searchers. Scheduling-related scientific works consider different (not mutually exclusive) types of a DG: • VC system: computing nodes are personal comput- 2 DESKTOP GRID AND BOINC ers of volunteers connected over the Internet. The 2.1 Desktop Grid and the BOINC platform scheduler faces heterogeneity, low network speed DG is a form of distributed high-throughput computing connection, unreliability, etc. system that uses idle time of non-dedicated geographically • Enterprise DG: computing nodes are workstations of distributed computing nodes connected over a low-speed an organization connected over a local area network. network (by “low-speed” we mean slow compared to su- There is an option to assign tasks to specific comput- percomputer interconnect). ing nodes to improve scheduling characteristics. DGs are of special interest because of their advantages, • hierarchical DG: there is an hierarchy of servers; including the following: each subordinate server requests batches of tasks from its master for its own computing nodes. The • ease of deployment and support, scheduler should be aware of the hierarchy and take • low cost, into account the tasks redistribution. • high scalability (linear for suitable problems), • peer-to-peer system: computing nodes can commu- 6 • significant potential peak performance (10 factor of nicate with each other. The scheduler should be a common PC), aware of the communication graph (including in- • ease of software development, formation on the connection speed); tasks can be • possibility to use legacy software. redistributed by computing nodes aiming to decrease But there are also several features that scale down the the server load or increase the data transfer speed. class of problems
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