Bandwidth on Tesla C1060 Which value is the response from bandwidth test?

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi, I run the bandwidth test provided in the CUDA toolkit on my Tesla C1060 card. The value obtained is of 73259 MB/s. Is this the “effectvive bandwidth” value (the theoretical value is around 102 GB/s)? Many thanks, jony

2

bandwidthTest uses
cudaMemcpy( d_odata, d_idata, memSize, cudaMemcpyDeviceToDevice)
to test device-device transfer.

It includes read and write, so bandwidth is about 70~80 % of theoretical bandwidth.

you can write a kernel to copy a data, then you will find that you cannot achieve full bandwidth.

However if you only read data, then you can reach higher bandwidth.