F. Checconi

Publications (2)0 Total impact

• Conference Proceeding: Characterization of the Communication Patterns of Scientific Applications on Blue Gene/P

  P.G. Raponi, F. Petrini, R. Walkup, F. Checconi
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  ABSTRACT: This paper examines the communication characteristics of a collection of scientific applications selected from the LLNL's Sequoia suite of benchmarks and the ANL's workload. By using an instrumentation library built on top of MPI we collect and characterize the applications's messaging behavior: the type of communication patterns and primitives used, the amount of time spent for communication, the message sizes, the total amount of data exchanged, and the impact of collective primitives, through communication matrices we visualize the actual communication patterns to highlight symmetries and other relevant peculiarities. Our analysis exposes several similarities between the applications -- namely the utilization of common low-dimensional stencils, and the use of a small set of collective primitives, in particular all-reduces with small vectors. Overall, our study provides a better understanding of the communication characteristics of several important scientific applications and benchmarks.
  Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW), 2011 IEEE International Symposium on; 06/2011
• Source

  Available from: Tommaso Cucinotta

  Conference Proceeding: The wizard of OS: a heartbeat for Legacy multimedia applications

  T. Cucinotta, L. Abeni, L. Palopoli, F. Checconi
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  ABSTRACT: Multimedia applications are often characterised by implicit temporal constraints but, in many cases, they are not programmed using any specialised real-time API. These ¿Legacy applications¿ have no way to communicate their temporal constraints to the OS kernel, and their quality of service (QoS), being necessarily linked to the temporal behaviour, fails to satisfy acceptable standards. In this paper we propose an innovative way for dealing with these applications, based on the combination of an on-line identification mechanism (which extracts from high-level observations such important parameters as the execution rate) and an adaptive scheduler (specialised for legacy applications) that identifies the correct amount of CPU needed by each application. Preliminary experimental results are reported, proving the effectiveness of the proposed idea in providing a widely used multimedia player on Linux with appropriate QoS guarantees, through an appropriate choice of the scheduling parameters. Finally, a detailed road-map is presented with the possible extensions to the approach.
  Embedded Systems for Real-Time Multimedia, 2009. ESTIMedia 2009. IEEE/ACM/IFIP 7th Workshop on; 11/2009