Abstract

International audience; Modern embedded processors have gone through multiple internal optimization to speed-up the average execution time e.g., caches, pipelines, branch prediction. Besides, internal communication mechanisms and shared resources like caches or buses have a significant impact on Worst-Case Execution Times (WCETs). Having an accurate estimate of a WCET is now a challenge. Probabilistic approaches provide a viable alternative to single WCET estimation. They consider WCET as a probabilistic distribution associated to uncertainty or risk.In this paper, we present synthetic benchmarks and associated analysis for several LEON3 configurations on FPGA targets. Benchmarking exposes key parameters to execution time variability allowing for accurate probabilistic modeling of system dynamics. We analyze the impact of architecture-level configurations on average and worst-case behaviors.; Les processeurs embarqués modernes sont passés par optimisation interne multiple pour accélérer l'exécution moyenne par exemple le temps, les caches, les pipelines, la prédiction de branchement. Par ailleurs, mécanismes de communication et de partage des ressources comme des caches ou bus ont un impact significatif sur le temps d'exécution pire des cas (WCETs). Avoir une estimation précise d'un WCET est maintenant en défi. Les approches probabilistes fournies pour des alternatives viables à Singles WCET estimation. Ils considèrent comme un WCET probabiliste la distribution associée à l'incertitude ou le risque du pire cas.Dans cet article, nous présentons des benchmarks synthétiques et associés analyse pour plusieurs configurations LEON3 sur FPGA cibles. Benchmarking expose l'effet de certains paramètres sur la variabilité de l'exécution des taches afin de permettre à la modélisation probabiliste précise de la dynamique du système. Nous analysons l'impact des configurations sur les comportements moyens et pire cas du systeme.

Abstract

Diagnostic microbial isolates of bio-safety levels 3 and 4 are difficult to handle in medical field camps under military deployment settings. International transport of such isolates is challenging due to restrictions by the International Air Transport Association. An alternative option might be inactivation and sequencing of the pathogen at the deployment site with subsequent sequence-based revitalization in well-equipped laboratories in the home country for further scientific assessment. A literature review was written based on a PubMed search. First described for poliovirus in 2002, de novo synthesis of pathogens based on their sequence information has become a well-established procedure in science. Successful syntheses have been demonstrated for both viruses and prokaryotes. However, the technology is not yet available for routine diagnostic purposes. Due to the potential utility of diagnostic sequencing and sequence-based de novo synthesis of pathogens, it seems worthwhile to establish the technology for diagnostic purposes over the intermediate term. This is particularly true for resource-restricted deployment settings, where safe handling of harmful pathogens cannot always be guaranteed. peerReviewed Document type: Article