Investigating a problem with 3D Registration using the Mutual Information measure(s):

During the Finetune stage (which is 100% multi-threaded), Intel Performance monitor indicates only about 30% load of 8 threads (i.e. 2.4 threads on average).





Update: Was able to substantially speed up the Finetune stage for the Mutual Information calculation.  Correspondingly the processor load is at 58% at this stage.

However, the principal part of the MI can not be parallelized efficiently due to the summation of the large Histogram memory object.