A Package for OpenCL Based Heterogeneous Computing on Clusters with Many GPU Devices
http://www.mosix.org/txt_pub.html
The authors provide a package named Many GPUs Package(MGP). MGP runs OpenCL applications on the cluster consists many nodes that have a GPU or GPUs without modifying OpenCL kernel. The user should port an OpenCL host program to a program that uses MGP API. This paper does not address how to distribute workload into nodes.
Amnon Barak