9:15 AM - 9:30 AM
[PEM26-02] Numerical simulation of asymmetric reconnecton with GPU
Keywords:asymmetric reconnection, GPGPU, parallel calculation
In this calculation, GPU-accelerated computing(GPGPU) was performed. Although we use only one GPU now, we are going to use multiple GPUs. In that case, the slow transmission speed between CPU and GPU becomes a large problem. On the parallel computing with multiple GPUs, calculation domain is divided into arbitrary pieces and each GPU must have the information required to calculate in a each device memory. However, the transferring of the data between GPU-GPU is not permitted. Instead of it, we use the communication between CPU-GPU. This process becomes the bottle neck and this GPU-accelerated computing is not effective. In order to avoid this problem, we hide the data communication between CPU-GPU behind the GPU calculation.
Furthermore, using this GPGPU code we confirmed the previous study by Cassak & Shay in 2007 that in the asymmetric reconnection, X-point moves toward the weak magnetic field side.