VRworks360 not using full GPU


I am stitching 360 mono videos using nvstitch from VRworks360 on a cluster with two Tesla P100 GPUs. I realized that nvstitch is only using around 70% of one of the GPUs and is not taking full advantage of it. Does anyone know the reason? My guess is on the algorithm’s limitations but I am not sure. If that is not the case and it can use a full GPU, is there any way to make full use of the two GPUs?

Thanks in advance!