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This paper describes a private cloud platform on our recently introduced supercomputer system, the AIST Super Green Cloud (ASGC). This is a fully virtualized High Performance Computing (HPC) system. ASGC is a 155 node-InfiniBand cluster with a theoretical peak performance of 69.44 TFLOPS. The software stack is built on the integration of cloud computing technologies including Apache CloudStack, KVM, Ceph cluster storage, and Zabbix monitoring system. To provide users with virtual clusters with near bare-metal performance, our extended CloudStack allows the user’s guest OS to directly access an InfiniBand HCA by using PCI passthrough or SR-IOV. ASGC has been in operation since July 2014 with over 30 users and we report lessons learned from the first six months of operation. We can launch a highly productive system in a short development time. We also found several serious problems mainly related to Apache CloudStack, and we are improving it to achieve stable operation. We also report the elapsed time of a virtual cluster deployment and preliminary experimental results using InfiniBand HCA with SR-IOV. Our results show that 1) although the performance of SR-IOV is comparable to that of PCI passthrough, some unexpected performance degradation is often observed, and 2) VCPU pinning is effective for both improving the performance and reducing performance fluctuations.

AIST Super Green Cloud: Lessons Learned from the Operation and the Performance Evaluation of HPC Cloud