In this work, we developed a new technique called Compulsory Compound Journaling (C2J) to increase the coalescing degree of shared updates in journal transactions. C2J introduces intentional delay in waking up the JBD thread to extend the interval ...

Virtual machines can be run inside one physical machine. This advantage enables cloud service providers and data centers to provide the identical and independent services to multiple users with fewer hardware. QEMU, a virtual machine that is used widely,...

This work is dedicated to eliminating the overhead required for guaranteeing the storage order in the modern IO stack. The existing block device adopts a prohibitively expensive approach in ensuring the storage order among write requests: interleaving ...

In this work, we develop the Orchestrated File System (OrcFS) for Flash storage. OrcFS vertically integrates the log-structured file system and the Flash-based storage device to eliminate the redundancies across the layers. A few modern file systems ...

Nonvolatile memory, which exhibits low I/O latency and guarantees persistency of data, is considered as a new memory that is going replace the volatile memory. Since the nonvolatile memory has a smaller capacity than NAND Flash memory or hard disk ...

This work is dedicated to improve the performance of the fsync(), which is one of the most expensive system calls in UNIX operating systems. Due to the recent advancement of the Flash storage based storage device, the storage device can flush the data ...

Recovery from sudden power-off (SPO) is one of the primary concerns among practitioners which bars the quick and wide deployment of flash storage devices. In this work, we propose Metadata Embedded Write (MEW), a novel scheme for handling the sudden power-...

In this work, we develop IO trace and analysis framework, Androtrace, which is specifically tailored for Android platform. Unlike earlier works that required prolonged post processing procedures, Androtrace not only traces with low overhead, but also ...

In this work, we developed a novel multithreaded variable size chunking method, MUCH, which exploits the multicore architecture of the modern microprocessors. The legacy single threaded variable size chunking method leaves much to be desired in terms of ...

Handling of storage IO in modern operating systems assumes that such devices are slow and CPU cycles are valuable. Consequently, to effectively exploit the underlying hardware resources, for example, CPU cycles, storage bandwidth and the like, whenever ...

In this work, we developed a Heap-Based Persistent Object Store (HEAPO) to manage persistent objects in byte-addressable Nonvolatile RAM (NVRAM). HEAPO defines its own persistent heap layout, the persistent object format, name space organization, object ...

Existing computer systems do not allow the user to access the system when turning off the disk containing the OS for saving energy. Thus existing studies have focused on devising effective disk spin up/down schemes. This paper proposes the scheme to ...

In this work, we develop a novel hybrid file system, FRASH, for storage-class memory and NAND Flash. Despite the promising physical characteristics of storage-class memory, its scale is an order of magnitude smaller than the current storage device ...

Embedded systems such as PVR, set-top box, HDTV put unique demand on I/O subsystem design. Underlying software, particularly file system, needs to be elaborately designed so that it can meet tight constraints of consumer electronics platform: ...

Due to recent rapid deployment of Internet Appliances and PostPC products, the importance of developing lightweight embedded operating system is being emphasized more. In this article, we like to present the details of design and implementation ...

In this paper, we present an intelligent buffer cache management algorithm in multimedia data retrieval called Adaptive Buffer cache Management (ABM). The proposed ABM scheme automatically detects the reference pattern of each file and intelligently ...