OpenCL Performance Evaluation on Modern Multicore CPUs

Table 1

Experimental environment.

CPUs	Intel Xeon E5645
# Cores	4
Vector width	SSE 4.2, 4 single precision FP
Caches	L1D/L2/L3: 64 KB/256 KB/12 MB
FP peak performance	230.4 GFlops
Core frequency	2.40 GHz
DRAM	4 GB
GPUs	NVidia GeForce GTX 580
# SMs	16
Caches	L1/Global L2: 16 KB/768 KB
FP peak performance	1.56 TFlops
Shader Clock frequency	1544 MHz
O/S	Ubuntu 12.04.1 LTS
Platform	Intel OpenCL Platform 1.5 for CPU; NVidia OpenCL Platform 4.2 for GPU
Compiler	Intel C/C++ compiler 12.1.3