Many-core heterogeneous designs are nowadays widely available among embedded systems. Initiatives such as the HSA push for a model where the host processor and the accelerator(s) communicate via coherent, Uniied Virtual Memory (UVM). In this paper we describe our experience in porting the OpenMP v4 programming model to a low-end, heterogeneous embedded system based on the PULP many-core accelerator featuring lightweight (software-managed) UVM support. We describe a GCC-based toolchain which enables: i) the automatic generation of host and accelerator binaries from a single, high-level, OpenMP parallel program; ii) the automatic instrumentation of the accelerator program to transparently manage UVM. This enables up to 4× faster execution compared to traditional copy-based oload mechanisms.

Enabling zero-copy OpenMP ofloading on the PULP many-core accelerator

Capotondi, Alessandro;Marongiu, Andrea
2017

Abstract

Many-core heterogeneous designs are nowadays widely available among embedded systems. Initiatives such as the HSA push for a model where the host processor and the accelerator(s) communicate via coherent, Uniied Virtual Memory (UVM). In this paper we describe our experience in porting the OpenMP v4 programming model to a low-end, heterogeneous embedded system based on the PULP many-core accelerator featuring lightweight (software-managed) UVM support. We describe a GCC-based toolchain which enables: i) the automatic generation of host and accelerator binaries from a single, high-level, OpenMP parallel program; ii) the automatic instrumentation of the accelerator program to transparently manage UVM. This enables up to 4× faster execution compared to traditional copy-based oload mechanisms.
2017
Proceedings of the 20th International Workshop on Software and Compilers for Embedded Systems, SCOPES 2017
68
71
Capotondi, Alessandro; Marongiu, Andrea
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/613503
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