Contract type : Internship agreement
Level of qualifications required : Graduate degree or equivalent
Fonction : Internship Research
The internship will take place at the Inria Paris Research Centre in the KOPERNIC project-team, 2 Rue Simone IFF, 75012 Paris and will be supervised by Yasmina Abdeddaim and Liliana Cucu Grosjean
The internship allowance is 500 euros per month.
The internship may be followed by a PhD thesis.
The execution time of programs executed on multicore processors may have large time variability due to features like multiple levels of caches and pipelines, speculative branching, communicating through shared memory, etc., that introduce variations between the smallest and largest values of the program execution times. This time variability makes the use of these multicore processors unpredictable and thus unsafe for safety critical applications with real-time constraints.
The goal of the internship is to deal with the problem of time variability of programs executed on a general purpose processor, e.g., ARM Cortex-A53. In fact, some of the features of these processors are not well documented, and the algorithms used in the implementation of these features are somehow obscure.
The purpose during this internship is to use statistical methods to deduce the algorithms and tricks used by the designers in the implementation of these features by providing statisticl relations between these features and the time variability of execution times of programs.
The stages of the internship are:
Propose a set of benchmark programs that will allow us to focus in every feature of the processor and generate at set of representative execution times for each program.
Use statistical methods to analyze each set of execution times with the goal of deducing a formal relation between each feature and its impact on the execution time of a program.
Deduce a general formal relation between the execution time of a program and a set of features used during the execution of this program by proposing composition rules to compose the formal relations of each feature proposed in stage 2.
 Wilhelm, Reinhard and Engblom, Jakob and Ermedahl, Andreas and Holsti,Niklas and Thesing, Stephan and Whalley, David and Bernat, Guillem and Ferdinand, Christian and Heckmann, Reinhold and Mitra, Tulika and Mueller,Frank and Puaut, Isabelle and Puschner, Peter and Staschulat, Jan and Stenstrom, The Worst-case Execution-time Problem: Overview of Methods and Survey of Tools, ACM Trans. Embed. Comput. Syst., 7(3), May 2008.
 R. I. Davis and A. Burns, A survey of hard real-time scheduling formultiprocessor systems, ACM Comput. Surv, 43(4), 2011.
 R. I. Davis and L. Cucu-Grosjean, A Survey of Probabilistic Timing Analysis Techniques for Real-Time Systems, LITES, 6(1).
Processor architecture, statistics.
- Partial reimbursement of public transport costs
- Flexible organization of working hours
- Professional equipment available (videoconferencing, loan of computer equipment, etc.)
- Social, cultural and sports events and activities
- Access to vocational training
- Theme/Domain : Embedded and Real-time Systems
- Town/city : Paris
- Inria Center : CRI de Paris
- Starting date : 2020-02-03
- Duration of contract : 6 months
- Deadline to apply : 2021-01-31
The keys to success
Motivation to research.
Inria is the French national research institute dedicated to digital science and technology. It employs 2,600 people. Its 200 agile project teams, generally run jointly with academic partners, include more than 3,500 scientists and engineers working to meet the challenges of digital technology, often at the interface with other disciplines. The Institute also employs numerous talents in over forty different professions. 900 research support staff contribute to the preparation and development of scientific and entrepreneurial projects that have a worldwide impact.
Instruction to apply
Defence Security :
This position is likely to be situated in a restricted area (ZRR), as defined in Decree No. 2011-1425 relating to the protection of national scientific and technical potential (PPST).Authorisation to enter an area is granted by the director of the unit, following a favourable Ministerial decision, as defined in the decree of 3 July 2012 relating to the PPST. An unfavourable Ministerial decision in respect of a position situated in a ZRR would result in the cancellation of the appointment.
Recruitment Policy :
As part of its diversity policy, all Inria positions are accessible to people with disabilities.
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