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35.705078 L 28.587891 14.294922 z " transform="scale(1.7,1.7)" id="path7" /></g></svg></a> <a href='https://www.linkedin.com/company/lip6' title='LinkedIn' target='_blank' rel='noopener' class='linkedin'><img src='../images/logo/LinkedIn.png' alt='X'></a> </div>  </div>  </header>   <div id='content-wrap'> <div class='row pb-3'> <div class='col'> <ul class='fil fa-ul'> <li class='home'><a href='../'><i class='fa-li fa fa-home'></i></a></li> <li><a href='../informations/annuaire.php'>Annuaire</a></li></ul> </div> </div> <div class='row'> <div class='col-6'> <h1>MAHAMDI Célia</h1> doctorant à Sorbonne Université<br>Équipe : <a href='../recherche/team.php?acronyme=DELYS'>DELYS</a><br> <i class='fa fa-solid fa-globe'></i> <a href='https://lip6.fr/Celia.Mahamdi'>https://lip6.fr/Celia.Mahamdi</a></div> <div class='col-sm-6 animate__zoomIn text-end'> </div> </div> <div class='row''> <div class='col'> <br> <b>Direction de recherche</b> : Mesaac MAKPANGOU <br> <b>Co-encadrement</b> : LEJEUNE Jonathan, SOPENA Julien </div></div><div class='row'> <div class='col'> <h2 >Multi-consensus distribué : agrégation et révocabilité</h2> <p class='sujet fr'>OMAHA (Opportunistic Message Aggregation for pHase-based Algorithms) est un mécanisme d’agrégation de messages conçu pour les algorithmes à phases, couramment utilisés dans les environnements Cloud. Dans ces environnements où la bande passante est une ressource critique, la gestion des petits messages, qui occupent une grande partie du trafic réseau, pose un défi majeur. OMAHA tire parti des communications prévisibles des algorithmes à phases pour regrouper opportunément les messages destinés au même processus, réduisant ainsi le nombre total de messages envoyés. Les expérimentations montrent qu’OMAHA permet d’économiser jusqu’à 30% de bande passante avec une dégradation de latence limitée à 5% sur l’algorithme Paxos.</p><p>Dans les systèmes distribués, atteindre un consensus sur une action ou une valeur est un défi complexe, surtout lorsque les processus sont soumis à des contraintes. De nombreux systèmes, tels que les systèmes multi-agents (véhicules autonomes, gestion d’agenda, robotique, etc.) ou encore les systèmes d’allocation de ressources, doivent respecter des contraintes tout en atteignant un objectif global commun. Cependant, les algorithmes de consensus traditionnels ne prennent pas en compte ces contraintes. Pour tolérer les pannes, certains algorithmes définissent un nombre maximal de fautes qu’ils peuvent supporter. Cela permet à l’algorithme de progresser sans attendre la réponse de tous les processus. En conséquence, la valeur décidée est souvent imposée par un sous-ensemble de processus, la majorité. Les contraintes de la minorité sont ainsi ignorées. Pour répondre à ce problème, nous avons introduit le Consensus f-Révocable. Ce consensus revisité permet de choisir une valeur qui respecte les contraintes des processus tout en offrant la possibilité de révoquer une décision prise par la majorité si celle-ci viole les contraintes d’un processus de la minorité.</p> <br><b>Soutenance</b> : 02/12/2024<h2>Membres du jury :</h2> Emmanuelle ANCEAUME, Directrice de recherche, IRISA [Rapporteur]<br> Gil UTARD, Professeur des Universités, MIS, Université de Picardie Jules Verne [Rapporteur]<br> Frédéric Le MOUËL, Professeur des Universités, INSA Lyon<br> Jonathan LEJEUNE, Maître de Conférences, Sorbonne Université, LIP6<br> Julien SOPENA, Maître de Conférences, Sorbonne Université, LIP6<br> Mesaac MAKPANGOU, Chargé de Recherche, Sorbonne Université, LIP6, Inria </div></div><br><span class='row'><span class='col'>Date de départ : 02/12/2024 <i class='fa-solid fa-arrow-right-from-bracket'></i></span></span> <script nonce='R4nd0m-pub'> document.addEventListener('DOMContentLoaded', function () { document.getElementById('type_pub').addEventListener('change', function (event) { var type = event.target.getAttribute('id'); elements = document.getElementById('pubs').getElementsByTagName('li'); for (var i = 0; i < elements.length; i++) { var classes = elements[i].className.split(' '); if (classes.indexOf('year') !== -1) { continue; } var j = classes.indexOf('secondplan'); if (type === 'ALL' || classes.indexOf(type) !== -1) { if (j !== -1) { classes.splice(j, 1); } } else { if (j === -1) { classes.push('secondplan'); } } elements[i].className = classes.join(' '); } event.stopPropagation(); }); }); </script> <div class='row'> <div class='col'> <h1>Publications 2021-2024</h1> <div id="type_pub"><input type="radio" id="ALL" name="pub" checked="checked" /><label for="ALL" title="3">Toutes</label> <input type="radio" id="COL" name="pub" /><label for="COL" title="2">Communications</label> <input type="radio" id="THE" name="pub" /><label for="THE" title="1">Soutenance de thèse</label> </div>  <ul id='pubs'> <li class='year'> <span class='year_number'>2024</span> <ul> <li class='D700 THE NAT'><span class='auteurs'>C. Mahamdi</span> : “<a href='https://www.lip6.fr/actualite/personnes-fiche.php?ident=D2423'>Multi-consensus distribué : agrégation et révocabilité</a>”, soutenance de thèse, soutenance 02/12/2024, direction de recherche Makpangou, Mesaac, co-encadrement : Lejeune, Jonathan, Sopena, Julien (2024)</li> </ul> </li>  <li class='year'> <span class='year_number'>2023</span> <ul> <li class='D700 COL'><span class='auteurs'>C. Mahamdi, J. Lejeune, J. Sopena, P. Sens, M. Makpangou</span> : “<a href='https://hal.science/hal-04445075'>OMAHA: Opportunistic Message Aggregation for pHase-based Algorithms</a>”, 2023 IEEE 28<sup>th</sup> Pacific Rim International Symposium on Dependable Computing (PRDC), Singapour, Singapore, pp. 150-160, (IEEE Computer Society), (ISBN: 979-8-3503-5876-6) (2023)</li> </ul> </li>  <li class='year'> <span class='year_number'>2021</span> <ul> <li class='D700 COL'><span class='auteurs'>C. Mahamdi, J. Lejeune, J. Sopena, P. Sens, M. Makpangou</span> : “<a href='https://hal.science/hal-03998672'>Réduire le coût de communication des algorithmes à phases par l’agrégation de messages : application à Paxos</a>”, COMPAS 2021 - Conférence francophone d'informatique en Parallélisme, Architecture et Système, Lyon (virtuelle), France (2021)</li> </ul> </li>  </ul>  </div> </div>  </div>  <footer > <div class='row'> <div class='footer-content twelve columns'> <span class='vcard'> <span class='geo'>48.8469752;2.3543572</span> <span class='fn org'>LIP6</span> <span class='adr'> <span class='post-office-box'>Boîte courrier 169</span> <span class='street-address'>Tour 26, Couloir 26-00, 2<sup>e</sup> étage</span> <span class='street-address'>4 place Jussieu</span> <span class='postal-code'>75252</span> <span class='locality'>Paris Cedex 05</span> <span class='country-name'>France</span> <span class='url'>https://www.lip6.fr</span> </span> 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