Evaluation of Optimized Barrier Algorithms for SCI Networks with Different MPI Implementations

The SCI Collectives Library is a new software package which implements optimized collective communication operations on SCI networks. It is designed to be coupled to different higher-level communication libraries (especially MPI implementations) by adapter modules, thereby giving them access to these optimized collectives. In this work, we present the design of the SCI Collectives Library and of adapter modules for Open MPI and NMPI. We also describe various barrier algorithms which we have implemented for this library and compare their performance to one another and to the barrier performance of MPI implementations which include support for SCI. 1

Implementationand Analysis of NonblockingCollectiveOperationson SCI Networks

1.1. Nonblocking Collective Communication Nonblocking collective communication operations are currently being considered for inclusion into the MPI standard and are an area of active research. The benefitsof such operations are documented by several recent publications, but so far, research concentrates on InfiniBand clusters. This paper describes an implementation of nonblocking collectives for clusters with the Scalable Coherent Interface (SCI) interconnect. We use synthetic and application kernel benchmarks to show that with nonblocking functions for collectivecommunicationperformanceenhancementscanbe achieved on SCI systems. Our results indicate that for the implementation of these nonblocking collectives data transfer methods other than those usually used for the blocking version should be considered to realize such improvements. 1

UNICORE-based Grid with MetaMPICH and MetaScheduling

Project no. FP6-004265 Reliable Orchestration of distributed MPI-Applications in

Characterization of pathogen-specific bacteriocins from lactic acid bacteria and their application within cocktail against pathogens in milk

Bacteriocins are the most important natural preservatives against pathogens, but their limited spectrum could not fully ensure food safety. In this study, bacteriocin producers showing specific-antimicrobial activity to foodborne pathogens were isolated and the success of the cocktail of pathogen-specific bacteriocins (PSBs) in milk were demonstrated. PSB producers were isolated from 250 different foods by a new approach that screening their antimicrobial activity against a mixture of five different strains of each Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus. Lactobacillus plantarum PFC339, Enterococcus faecalis PFC340, Lactobacillus delbrueckii subsp. lactis PFC341 were identified that inhibited the growth of pathogen strains respectively, but not lactic acid bacterial strains. The molecular sizes of PSBs were 1219.021, 3346.803, 4853.768 Da respectively. They inhibited by disrupting the permeability or creating pores on the cell walls. While 100 AU/mL decreased the amount of pathogens in milk which they are specifically active, each PSBs did not show any inhibitory effect on other two pathogens. However, PSBs cocktail was able to stop the growth of all inoculated pathogens. In conclusion, three bacteriocin producers specifically inhibiting B. cereus, L. monocytogenes, S. aureus were isolated and the growth of pathogens in food systems were prevented by use of these PSBs as cocktails for the first time. © 2019 Elsevier Lt