PetFMM—A dynamically load‐balancing parallel fast multipole library PetFMM is a portable, extensible software library for N-body interactions, using the fast multipole method (FMM). The software is built to be used as a part of the PETSc library, and it is distributed as open source. It can be used either in serial or parallel mode. A prominent feature of PetFMM is its capacity for dynamic load balancing, based on an optimizing strategy for distribution of work among processors and a model of both work estimates and communication estimates. Check out the latest calculations being done with PetFMM on the If you have interest or any questions about PetFMM, join the Mailing list and post there —traffic is very low and you can unsubscribe at any time: