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Tracing Hardware Monitors in the GR712RC Multicore Platform: Challenges and Lessons Learnt from a Space Case Study

Authors Xavier Palomo, Mikel Fernandez, Sylvain Girbal, Enrico Mezzetti, Jaume Abella, Francisco J. Cazorla, Laurent Rioux

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Author Details

Xavier Palomo
  • Barcelona Supercomputing Center, Spain
Mikel Fernandez
  • Barcelona Supercomputing Center, Spain
Sylvain Girbal
  • Thales Research, Palaiseau, France
Enrico Mezzetti
  • Barcelona Supercomputing Center, Spain
Jaume Abella
  • Barcelona Supercomputing Center, Spain
Francisco J. Cazorla
  • Barcelona Supercomputing Center, Spain
Laurent Rioux
  • Thales Research, Palaiseau, France

Funding

This work has been partially supported by a collaboration agreement between Thales Research and the Barcelona Supercomputing Center, and the European Research Council (ERC) under the EU’s Horizon 2020 research and innovation programme (grant agreement No. 772773). MINECO partially supported Jaume Abella under Ramon y Cajal postdoctoral fellowship (RYC-2013-14717).

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Xavier Palomo, Mikel Fernandez, Sylvain Girbal, Enrico Mezzetti, Jaume Abella, Francisco J. Cazorla, and Laurent Rioux. Tracing Hardware Monitors in the GR712RC Multicore Platform: Challenges and Lessons Learnt from a Space Case Study. In 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 165, pp. 15:1-15:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ECRTS.2020.15

Abstract

The demand for increased computing performance is driving industry in critical-embedded systems (CES) domains, e.g. space, towards the use of multicores processors. Multicores, however, pose several challenges that must be addressed before their safe adoption in critical embedded domains. One of the prominent challenges is software timing analysis, a fundamental step in the verification and validation process. Monitoring and profiling solutions, traditionally used for debugging and optimization, are increasingly exploited for software timing in multicores. In particular, hardware event monitors related to requests to shared hardware resources are building block to assess and restraining multicore interference. Modern timing analysis techniques build on event monitors to track and control the contention tasks can generate each other in a multicore platform. In this paper we look into the hardware profiling problem from an industrial perspective and address both methodological and practical problems when monitoring a multicore application. We assess pros and cons of several profiling and tracing solutions, showing that several aspects need to be taken into account while considering the appropriate mechanism to collect and extract the profiling information from a multicore COTS platform. We address the profiling problem on a representative COTS platform for the aerospace domain to find that the availability of directly-accessible hardware counters is not a given, and it may be necessary to the develop specific tools that capture the needs of both the user’s and the timing analysis technique requirements. We report challenges in developing an event monitor tracing tool that works for bare-metal and RTEMS configurations and show the accuracy of the developed tool-set in profiling a real aerospace application. We also show how the profiling tools can be exploited, together with handcrafted benchmarks, to characterize the application behavior in terms of multicore timing interference.

Subject Classification

ACM Subject Classification
  • Computer systems organization → Multicore architectures
Keywords
  • Multicore Contention
  • Timing interference
  • Hardware Event Counters
  • PMC

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