Enabling Dual-Core Mode in BlueGene/L: Challenges and Solutions
نویسندگان
چکیده
BlueGene/L is a massively parallel computer system with 65,536 dual-processor compute nodes. The peak performance of BlueGene/L is in excess of 360 TFLOP/s if both processor cores in a node are used for computation. The main challenge of deploying this dual-core mode of operation is that the L1 caches in each core are not hardware coherent. This forces a software-based approach to cache coherence and guides our design of a programming model for dual-core mode. In this paper, we describe the design, implementation, and performance evaluation of system software for enabling the use of dual-core mode on BlueGene/L. Our preliminary performance results show that our approach to dual-core mode is effective for key numerical kernels.
منابع مشابه
Implementing MPI on the BlueGene/L Supercomputer
The BlueGene/L supercomputer will consist of 65,536 dual-processor compute nodes interconnected by two high-speed networks: a three-dimensional torus network and a tree topology network. Each compute node can only address its own local memory, making message passing the natural programming model for BlueGene/L. In this paper we present our implementation of MPI for BlueGene/L. In particular, we...
متن کاملDesigning a dual-core photonic crystal fiber coupler by means of microfluidic infiltration
We report the results of our study on the role of microfluidic infiltration technique in improving the coupling characteristics of dual-core photonic crystal fiber (PCF) couplers. Using the finite element method (FEM), we evaluate the effective mode area, dispersion and coupling parameters of an infiltrated dual-core PCF. We use these parameters to design a compact and reconfigurable coupler by...
متن کاملDifferential impact of multi-focus fan beam collimation with L-mode and conventional systems on the accuracy of myocardial perfusion imaging: Quantitative evaluation using phantoms
Objective(s): A novel IQ-SPECTTM method has become widely used in clinical studies. The present study compares the quality of myocardial perfusion images (MPI) acquired using the IQ-SPECTTM (IQ-mode),conventional (180° apart: C-mode) and L-mode (90° apart: L-mode) systems. We assessed spatial resolution, image reproducibility and quantifiability using various physical phantoms. Materials and Me...
متن کاملA Scalable Hierarchical Parallelization Framework for Molecular Dynamics Simulation on Multicore Clusters
We have developed a scalable hierarchical parallelization framework for molecular dynamics (MD) simulation on emerging multicore clusters. The framework combines: (1) inter-node level parallelism by spatial decomposition using message passing; (2) intra-node (inter-core) level parallelism through a master/worker paradigm and cellular decomposition using critical section-free multithreading; and...
متن کاملIdentify the challenges of leadership in hospitals
Background: In this study, we seek to identify the challenges of leadership role in physicians. For physicians facing the challenge of being able to appear only as a leader is fraught with challenges. Because they have to follow the clinical duties of the patients at the same time. In fact, we face five major challenges along the way. This article introduces these five challenges and solutions ...
متن کامل