Evaluation of Successive CPUs/APUs/GPUs Based on an OpenCL Finite Difference Stencil - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2013

Evaluation of Successive CPUs/APUs/GPUs Based on an OpenCL Finite Difference Stencil

Henri Calandra
  • Fonction : Auteur
Romain Dolbeau
  • Fonction : Auteur
Issam Said

Résumé

The AMD APU (Accelerated Processing Unit) architecture, which combines CPU and GPU cores on the same die, is promising for GPU applications which performance is bottlenecked by the low PCI Express communication rate. However the first APU generations still have different CPU and GPU memory partitions. Currently, the APU integrated GPUs are also less powerful than discrete GPUs. In this paper we therefore investigate the interest of APUs for scientific computing by evaluating and comparing the performance of two successive AMD APUs (family codename Llano and Trinity), two successive discrete GPUs (chip codename Cayman and Tahiti) and one hexa-core AMD CPU. For this purpose, we rely on a 3D finite difference stencil, that is optimized and tuned in OpenCL. We detail the most interesting optimizations for each architecture and show very good performance in OpenCL: up to 500 Gflops on Tahiti. Finally, our results show that APU integrated GPUs outperform CPUs, and that integrated GPUs of upcoming APUs may match discrete GPUs for problems with high communication requirements.
Fichier non déposé

Dates et versions

hal-01216513 , version 1 (16-10-2015)

Identifiants

Citer

Henri Calandra, Romain Dolbeau, Pierre Fortin, Jean-Luc Lamotte, Issam Said. Evaluation of Successive CPUs/APUs/GPUs Based on an OpenCL Finite Difference Stencil. 21st Euromicro International Conference Parallel, Distributed and Network-Based Processing, PDP 2013, Feb 2013, Belfast, United Kingdom. pp.405-409, ⟨10.1109/PDP.2013.65⟩. ⟨hal-01216513⟩
123 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More