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[sajis997]

Hello forum,

I guess There are two ways to transfer data between cpu and gpu in OpenCL.

1. The Natural way - clEnqueueWriteBuffer() / clEnqueueReadBuffer()

2. Map/Unmap way - clEnqueueMapBuffer()

Which one is the better option for data transfer when large amount of data will be  involved?

Thanks

Sajjad

[himanshu_gautam]

It wont be very simple to find an answer on that, although in general Map/Unmap should be better.

The stuff you should try is to use use pinned memory for CPU while reading/writing. You can also look into zero copy buffers.

Please go through AMD APP OpenCL Programmig Guide for details.