Divergence time Divergence between execution time in compute visual profiler et cudaEv

Hi,

FILTER GPU --> 576.478 GPU time and 0.000061 seconde
LDPC GPU --> 41.312 GPU time and 0.000370 seconde

The GPU time come from the compute visual profiler et the other has been generated by cudaEvent functions. I don’t understand why the result are not proportionnel. What is the difference between GPU time and the time of cudaEvent function. Inside the documentation of Compute visual profiler, you can read the total GPU time are in micro seconds.