Hey Bwalya.
Thank you for the suggestion. We are working on improving memory efficiency of bundle adjustment algorithm. Expect an update soon, which will allow to process all the 8000 images in one go.. For now if you have less then 64 GB of memory, I recommend that you divide this dataset in two halves of 4000 images each or 4 quarters of 2000 images each, process them separately, a then join the results.