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Overhead on data transfer between 2 GPUs or several OpenCL devices

Question asked by whlucas on Jul 21, 2014
Latest reply on Jul 23, 2014 by dipak

Hello everyone,

I'm testing some stencil code on heterogeneous architectures by using 2 GPUs.

In order to update memory data in different GPUs, I tried to  use the function clEnqueueWriteBufferRec and  clEnqueueReadBufferRec to transfer 1000 Bytes data from table A on GPU_1 to table A' on GPU_2.

Then i found this phenomenon: the overhead of data transfer increases linearly with the size of table A (We only and always transfer 1000 Bytes data from table A!). I'd like to know if anyone has noticed that? any solution?