Amélioration des stratégies d'ordonnancement sur architectures NUMA à l'aidedes dépendances de données

National audienceLe récent ajout des dépendances de données à la norme OpenMP 4.0 offre au programmeur une manière flexible de synchroniser les tâches. Grâce à cela, le compilateur et le support exé-cutif peuvent tous les deux savoir exactement quelles données sont lues ou écrites par quelles tâches. Les performances sur architectures NUMA peuvent être fortement impactées par le placement des données et l'ordonnancement des tâches. Les informations présentes dans les dépendances de données peuvent être utilisées pour contrôler le placement physique des don-nées, ainsi que pour contrôler les stratégies de placement des tâches en fonction de la topologie. Cet article présente plusieurs heuristiques pour ces stratégies, et leurs implémentations dans notre support exécutif OpenMP : XKAAPI. Nous présentons également nos évaluations sur des applications d'algèbre linéaire, exécutées sur une machine NUMA à 192 coeurs, et comparées aux stratégies proposées par l'état de l'art

“New Alien Mediterranean Biodiversity Records” (March 2021)

This article includes twenty (20) new records of alien and cryptogenic species in the Mediterranean Sea, belonging to six (6) Phyla (Rhodophyta, Tracheophyta, Mollusca, Arthropoda, Bryozoa, and Chordata) distributed from the Eastern Mediterranean to the Sea of Alboran. The records are reported from nine (9) countries and can be classified into two categories: new records for the Mediterranean Sea and new records of non-indigenous species expanding within the Mediterranean Sea. The first category includes the gastropod Turbo radiatus from Lebanon coasts, the portunid crab Charybdis (Charybdis) natator from Tunis southern lagoon, the mollusc Thuridilla mazda from South Spain, and the nudibranch Okenia picoensis from the Alboran coasts of Spain and from Malta. The second category includes the bivalve Nudiscintilla cf. glabra from the Aegean coast of Turkey, the rhodophyte Colaconema codicola from the North Aegean coasts of Greece, the naked band gaper Champsodon nudivittis from the Sea of Marmara, Turkey. Also, the brachyuran Gonioinfradens giardi from the Greek Ionian waters, the codlet Bregmaceros nectabanus from the Croatian coasts of the Adriatic Sea, and the bryozoan Arbopercula tenella and copepod Parvocalanus crassirostris both from the Gulf of Trieste, Slovenian and Italian coasts, respectively. New records were also reported for the ascidian Distaplia bermudensis from brackish the Gulf of Naples, Italy, the damselfish Abudefduf cf. saxatilis and the seagrass Halophila stipulacea from Sardinia, Tyrrhenian Sea, and for the fish Paranthias furcifer from the harbour of Almeria, Alboran Sea, Spain. Through these records, an understanding of the expanding mechanisms and processes and, if possible, the development of mitigation measures within the region will be further facilitated

Proceedings of the Meeting Botany at the intersection of Nature, Culture, Art and Sciences

The scientific meeting for which the Proceedings are published in this volume 28 of Bocconea was not organized by mere chance. It was designed as an appropriate way to celebrate the 80th anniversary of Professor Werner Greuter, tireless protagonist of OPTIMA and key figure in Mediterranean, European and, by certain of his skills, indeed world botany.The two-day Symposium was sponsored by the Section of Botany and Plant Ecology of the STEBICEF Department of the University of Palermo and received substantial support from the Selinunte and Cave di Cusa Archaeological Park, the International Foundation Pro Herbario Mediterraneo, and the Foundation Herbarium Greuter. The scientific programme comprised four sessions with invited speakers, plus a poster session. About one hundred scholars from many countries, young and old, were in attendance, including the authors of reports, lectures, and posters. Some of the papers assembled in this proceedings volume have been published in advance in Flora Mediterranea, volumes 28 (2018) and 29 (2019). Also included here are texts contributed, as a testimony of esteem, by some of professor Greuter’s friends who were unable to be present at the meeting

Time-energy Analysis of Multilevel Parallelism in Heterogeneous Clusters: the Case of EEG Classification in BCI Tasks

Present heterogeneous architectures interconnect nodes including multiple multi-core microprocessors and accelerators that allow different strategies to accelerate the applications and optimize their energy consumption according to the specific power-performance trade-offs. In this paper, a multi-level parallel procedure is proposed to take advantage of all nodes of a heterogeneous CPU-GPU cluster. Two more alternatives have been implemented, and experimentally compared and analyzed from both running time and energy consumption. Although the paper considers an evolutionary master-worker algorithm for feature selection in EEG classification, the conclusions from the experimental analysis here provided can be frequently applied, as many other useful bioinformatics and data mining applications show the same master-worker profile than the classification problem here considered. Our parallel approach allows to reduce the time by a factor of up to 83, with only about a 4.9% of energy consumed by the sequential procedure, in a cluster with 36 CPU cores and 43 GPU compute units.Spanish Ministerio de Ciencia, Innovación y Universidades under grant PGC2018-098813-B-C31ERDF fun

Empires of the Sea

Empires of the Sea brings together studies of maritime empires from the Bronze Age to the Eighteenth Century. The volume develops the category of maritime empire as a specific type of empire in both European and ‘non-western’ history.; Readership: Anyone concerned with World History, and specifically those interested in maritime history and the comparative study of empires

The challenge of freedom in the Southeastern Europe. OSW Report, July 2015

Over the past few decades substantial progress has been achieved in the democratisation and modernisation of the countries of Southeastern Europe. The formal democratic institutions were introduced, a liberalisation of trade resulted in the reintegration of the region into the global economy and some of them successfully applied to join the EU and NATO. But the transformation process is far from over. In the past years the achievements of the political and economic transformation have been rolled back and the quality of governance has declined in many countries. To avoid a further deterioration of the situation in the region the new impulse for institutional transformation and a change of the development model are needed. This report is the outcome of a discussion held during the conference “The Freedom Challenge in Southeastern Europe – Implications for Poland”. This joint event was developed by the Centre for Eastern Studies and Ideas Lab – the President’s Expert Programme at the Chancellery of the President of the Republic of Poland. The chapters of the report reflect the main three subjects debated during the conference. In the first chapter Spasimir Domaradzki assesses the rule of law and its influence on the consolidation of democracy in the region. In the second chapter Marta Szpala focuses on economic development in Southeastern Europe. The third chapter is written by Adam Balcer and analyses the key instruments Russia is using to build influence in this region