Analysis of Peer-to-Peer Protocols Performance for Establishing a Decentralized Desktop Grid Middleware
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1 Analysis of Peer-to-Peer Protocols Performance for Establishing a Decentralized Desktop Grid Middleware Heithem Abbes 1,2, Jean-Christophe Dubacq 2 1 Unité de Recherche UTIC ESSTT, Université de Tunis 2 Laboratoire LIPN, UMR 7030 CNRS, Université Paris 13 EuroPar, SGS August, th 2008
2 Outlines Introduction Desktop Grid Peer-to-peer systems Resource discovery Candidates libraries Bonjour Avahi Pastry Experimental setup Analysis of results Conclusion and perspectives Europar/SGS 08 Analysis of P2P Protocols Performance for 2
3 Desktop Grid (1/2) Desktop Grid technology consists in exploiting personal computer geographically dispersed: Deliver massive compute power Investigate complex and demanding problems XtremWeb (Orsay) XW-CH (Genève) GTRS (Tunis) Systems with centralized architecture Europar/SGS 08 Analysis of P2P Protocols Performance for 3
4 Desktop Grid (2/2) Number of resources increases: Scalability Auto-organization Dynamic re-configuration Decentralization Performance: Required property Intinsic proterty of P2P systems Europar/SGS 08 Analysis of P2P Protocols Performance for 4
5 Peer-to-peer systems P2P tools offer functionalities for the construction of high-level services use P2P tools to construct Desktop Grid systems Efficiency of P2P libraries? Simulation Analysis of complexity Very few experimental analyses Experimental evaluation Unavoidable Europar/SGS 08 Analysis of P2P Protocols Performance for 5
6 Resource discovery (1/2) Fundamental process for the good working of the system Central: global information Fast and simple search Single point of failure Decentralized: Distributed information (broadcasting) Complex research No central element Europar/SGS 08 Analysis of P2P Protocols Performance for 6
7 Resource discovery (2/2) Three candidates libraries provide the API to construct P2P applications: Bonjour Avahi Pastry Experimental evaluation on Grid'5000 Registration time of services Discovery time of services. Europar/SGS 08 Analysis of P2P Protocols Performance for 7
8 Objectives Choose the best P2P libraries for... Designing and implementing of a decentralized middleware for the Desktop Grid. Decentralized service discovery Europar/SGS 08 Analysis of P2P Protocols Performance for 8
9 Virtualization of the network High level middleware able to virtualize the network no more problems with firewall and NAT => Bonjour, Avahi and Pastry on top of such middleware. Instant Grid / Private Virtual Cluster is one of the candidate for network virtualization. The main requirements are: simple network configuration no degradation of resource security no need to re-implement existing distributed applications. Under these assumptions, it is reasonable to check if Bonjour, Avahi and Pastry can scale up. Europar/SGS 08 Analysis of P2P Protocols Performance for 9
10 Outlines Introduction Desktop Grid Peer-to-peer systems Resource discovery Candidates libraries Bonjour Avahi Pastry Experimental setup Analysis of results Conclusion and perspectives Europar/SGS 08 Analysis of P2P Protocols Performance for 10
11 Bonjour (1/2) Bonjour is an implementation by Apple of the ZeroConf protocol. Obtain a functional IP network without DHCP or DNS servers. Bonjour is structured around three functionalities: Dynamic allocation of IP addresses without DHCP Resolution of names and IP addresses without DNS Services discovery without directory server. Europar/SGS 08 Analysis of P2P Protocols Performance for 11
12 Bonjour (2/2) At a technical level, Bonjour uses Link-Local addresses: An IP address is selected by means of a pseudo-random generator in a defined range of addresses ( ). mdns: Machines can still refer the ones with the others by name using the protocol mdns (multicast DNS). DNS-SD protocol (DNS Service Discovery) to discover the services published in a local area network. Europar/SGS 08 Analysis of P2P Protocols Performance for 12
13 Avahi Based on Linux implementation of mdns protocol. System that facilitates the service discovery on a local network. Allows programs to publish and to discover services and hosts running avahi daemon on a local network without any specific configuration. Implementation of DNS-SD specifications and Multicast DNS of ZeroConf. Use D-Bus (an asynchronous communication library between process) for the communication between applications. Europar/SGS 08 Analysis of P2P Protocols Performance for 13
14 Pastry (1/2) Generic, evolutionary and efficient infrastructure for the P2P applications. Fully decentralized, evolutionary, auto-organized. Automatic adaptation to the arrival, the departure or the failure of nodes connection. Europar/SGS 08 Analysis of P2P Protocols Performance for 14
15 Pastry (2/2) Based on DHT (Distributed Hash Table) Pastry nodes form, a decentralized, auto-organized and fault-tolerant, peers network (or logical ring) Creation of bootstrap node. The new arrived node contacts the bootstrap to join the logical ring. Pastry node Unique identifier : nodeid State table containing the neighbors A Pastry node routes the message efficiently to the node which is numerically closest, through alive nodes. Europar/SGS 08 Analysis of P2P Protocols Performance for 15
16 Outlines Introduction Desktop Grid Peer-to-peer systems Resource discovery Candidates libraries Bonjour Avahi Pastry Experimental setup Analysis of results Conclusion and perspectives Europar/SGS 08 Analysis of P2P Protocols Performance for 16
17 Highly re-configurable and controllable Gather 9 sites geographically distributed in France All sites are connected by the RENATER network (10 Gb/ses) Site of Orsay: machines are connected with a network of 1Gb/s. More than 300 machines used. All machines have AMD Opterons processors and 1Gb/s network cards. Europar/SGS 08 Analysis of P2P Protocols Performance for 17
18 Specific image for Grid'5000 Grid'5000 offers an infrastructure with standard images. Personalization of an image to support Avahi, Bonjour and Free-Pastry. NTP to synchronize all machines OAR and Kadeploy Reservation and deployment of the specific image on all machines Europar/SGS 08 Analysis of P2P Protocols Performance for 18
19 Evaluation criterias Scalability and response time of the 3 systems The maximal number of nodes that can be supported by these tools Necessary response time ( latency ) to discover the new node that has just connected on the network (according to the state of the grid). Europar/SGS 08 Analysis of P2P Protocols Performance for 19
20 Service registration Registration of one service on each machine If the service is running, the machine is connected on the network. Otherwise (we de-activate the service) the machine is disconnected. 2 types of registration Sequential registration Every 60 sec, we activate a service Only multicast per minute (non stressed network)? Simultaneous registration All services are activated on the same instant. N multicasts at a given tic (stressed network) Time of registration = Time between the demand and the receipt of notification Europar/SGS 08 Analysis of P2P Protocols Performance for 20
21 Outlines Introduction Desktop Grid Peer-to-peer systems Resource discovery Candidates libraries Bonjour Avahi Pastry Experimental setup Analysis of results Conclusion and perspectives Europar/SGS 08 Analysis of P2P Protocols Performance for 21
22 Sequential registration There is not a great difference between the three libraries. Bonjour and Avahi give similar results. Pastry spends almost same time to register 60% of services, needs less times to register first 30% but more times than Avahi and Bonjour for the rest (10%). Europar/SGS 08 Analysis of P2P Protocols Performance for 22
23 Simultaneous registration Avahi is the best since it spends less time (last registered service needs 1000 ms). Bonjour requires 1300 ms to register the last service. Pastry gives times close to those given by Avahi until 160 registrations, beyond this, it spends times definitely larger (until ms) that those of Avahi and Bonjour. Europar/SGS 08 Analysis of P2P Protocols Performance for 23
24 Service discovery (1/2) Discovery time : the elapsed time between the registration end of a service and its discovery time by the browser.. Bonjour Bonjour is reliable and very powerful in resources discovery. It discovers all the services with 0% of loss It discovers more than 300 services published simultaneously in less than 1 second. Europar/SGS 08 Analysis of P2P Protocols Performance for 24
25 Services discovery (2/2) Avahi loses 60% of registered services (simultaneous version) Improvement in the sequential version (loses just 4 services) Pastry 3% of lost services (among 300 registered services) in the two versions (Sequential and Simultaneous)? Discovery time <= 1 second Europar/SGS 08 Analysis of P2P Protocols Performance for 25
26 Outlines Introduction Desktop Grid Peer-to-peer systems Resource discovery Candidates libraries Bonjour Avahi Pastry Experimental setup Analysis of results Conclusion and perspectives Europar/SGS 08 Analysis of P2P Protocols Performance for 26
27 Conclusion The three protocols showed high performances except that Avahi failed to discover all services in simultaneous version and Pastry spends a considerably long time to register all services simultaneously. Bonjour is very powerful in registration and discovery in both sequential and simultaneous versions. Pastry also proved its performance in sequential registration and also in simultaneous case provided when we does not exceed 160 registrations at a given moment. Europar/SGS 08 Analysis of P2P Protocols Performance for 27
28 Perspectives We choose Bonjour to construct a decentralized middleware for Desktop Grid: BonjourGrid. BonjourGrid Vision: Publish/subscribe system based on Bonjour to monitor the machine status. Conceive and implement a decentralized and multi-coordinators platform of local DesktopGrid. Build an infrastructure which does not depend on a central element. No static coordinator Create the coordinator in a dynamic, automatic way and without any intervention of a system administrator. Each coordinator asks and seeks, in a decentralized way, idle machines to participate in the execution of a given application. Europar/SGS 08 Analysis of P2P Protocols Performance for 28
29 MERCI Europar/SGS 08 Analysis of P2P Protocols Performance for 29
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