Fast and accurate P³M cosmological simulations using a hardware accelerator

We implemented a fast and accurate particle-particle particle-mesh (P ³M) method using MDGRAPE-2, a hardware accelerator for arbitrary central forces. The results of cosmological N-body simulations using the MDGRAPE-2 P³M method agree with those using other P³M methods. We measured calculation times required for the MDGRAPE-2 P³M method on the system of a PC and one MDGRAPE-2 board. When we reduce memory requirement, the MDGRAPE-2 P³M method is ∼10 and ∼20 times faster than the adaptive and original P³M methods on the PC, respectively, under heavy particle clustering. When each P³M method is optimized for performance, the MDGRAPE-2 P³M method is as fast as the adaptive P³M method and ~10 times faster than the original P ³M method.