I have an application which is dynamically linked to a few dlls. Some of these dlls are statically linked to the Intel IPP library. I am wondering do I need to call ippInit() on each of these dll?
Yes, you need. The benefit of IPP DLLs - in terms of ippInit usage - is that they call ippInit "automatically" :). Simply speaking, it is done in DllMain. If you can do the same in DllMain of your dynamic libs, please do.