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Petri-nets as an Intermediate Representation for Heterogeneous Architectures

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This is a practice talk for Euro-Par 2011. The content presented is the same as a group talk given in February, however, it has been reduced in length to 20 minutes for the conference.

Many modern systems provide heterogeneous parallelism, for example NUMA multi-core processors and CPU -GPU combinations. Placement, scheduling and indeed algorithm choices affect the overall execution time and, for portable programs, must adapt to the target machine at either load-time or run-time. We see these choices as preserving I/O determinism but exposing performance non-determinism. We use Petri-nets as an intermediate representation for programs to give a unified view of all forms of performance non-determinism. This includes some scenarios which other models cannot support. Whilst NP-hard, efficient heuristics for approximating optimum executions in these nets would lead to performant portable execution across arbitrary heterogeneous architectures.

This talk is part of the Computer Laboratory Programming Research Group Seminar series.

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