We present ViMPIOS, a novel MPI-IO implementation based on ViPIOS, the Vienna Parallel Input Output System. ViMPIOS inherits the defining characteristics of ViPIOS, which makes it a client-server based system focusing on cluster architectures. ViMPIOS stands out from all other MPI-IO implementations by its ”truly” portable design, which allows not only applications to be transferred between par...

ab initio statistical mechanics of the ferroelectric phase transition in P bT iO 3 Abstract An effective Hamiltonian for the ferroelectric transition in P bT iO 3 is constructed from first-principles density-functional-theory total-energy and linear-response calculations through the use of a localized, symmetrized basis set of " lattice Wannier functions. " Explicit parametrization of the polar...

ion of the tertiary hydrogen atom by peroxy group located at A-position, viz., IO-AQJ IO-AQCJ is the lowest energy process among the H-transfer reactions involving any isooctane peroxy radicals. The activation barrier ΔH (TS-C1A) is as low as ca.17 kcal mol (16.74, 17.09, 16.95 kcal mol, correspondingly, at B3LYP/6-31G(d), G3MP2B3, and CBS-QB3 levels of theory in agreement with the unified para...

In a shared virtualized storage system that runs heterogeneous VMs with diverse IO demands, it becomes a problem for the hypervisor to cost-effectively partition and allocate SSD resources among multiple VMs. There are two straightforward approaches to solve this problem: either equally assigning SSDs to each VM or managing SSD resources in a fair competition mode. Unfortunately, they cannot fu...

Asynchronous IO (AIO) allows a process to continue to do other work while an IO operation initiated earlier completes. AIO allows a large number of random IO operations to be issued at once, allowing the disk subsystem to order access to data on disk, reducing average seek times considerably, as well as allowing much better utilization of disks in a multi-disk RAID environments where reads can ...

This work is dedicated to resolve the Journaling of Journal Anomaly in Android IO stack. We orchestrate SQLite and EXT4 filesystem so that SQLite’s file-backed journaling activity can dispense with the expensive filesystem intervention, the journaling, without compromising the file integrity under unexpected filesystem failure. In storing the logs, we exploit the direct IO to suppress the files...