I used ippiDFT functions from "Intel Parallel Studio XE 2016" on platform Windows 7 x64. For ours purpose we would like to use DFT functions with multi-threaded version. This functions works correctly with different number of threads. So far there is no problem. The problem is, when we compile our application with openmp flag, DFT starts produces garbage when threads number used to calculation is different than 1. I prepared test source codes in attachments. But before that, let me write more details.