• Computing: Resilient system using only n

    From ScienceDaily@1:317/3 to All on Mon Apr 25 22:30:44 2022
    Computing: Resilient system using only non-volatile memory
    Lightweight Persistence Centric System 'LightPC' ensures both data and execution persistence for energy-efficient full system persistence

    Date:
    April 25, 2022
    Source:
    The Korea Advanced Institute of Science and Technology (KAIST)
    Summary:
    A research team has developed hardware and software technology
    that ensures both data and execution persistence. The Lightweight
    Persistence Centric System (LightPC) makes the systems resilient
    against power failures by utilizing only non-volatile memory as
    the main memory.



    FULL STORY ==========================================================================
    A KAIST research team has developed hardware and software technology that ensures both data and execution persistence. The Lightweight Persistence Centric System (LightPC) makes the systems resilient against power
    failures by utilizing only non-volatile memory as the main memory.


    ==========================================================================
    "We mounted non-volatile memory on a system board prototype and created an operating system to verify the effectiveness of LightPC," said Professor Myoungsoo Jung. The team confirmed that LightPC validated its execution
    while powering up and down in the middle of execution, showing up to
    eight times more memory, 4.3 times faster application execution, and 73%
    lower power consumption compared to traditional systems.

    Professor Jung said that LightPC can be utilized in a variety of
    fields such as data centers and high-performance computing to provide large-capacity memory, high performance, low power consumption, and
    service reliability.

    In general, power failures on legacy systems can lead to the loss of data stored in the DRAM-based main memory. Unlike volatile memory such as
    DRAM, non- volatile memory can retain its data without power. Although non-volatile memory has the characteristics of lower power consumption
    and larger capacity than DRAM, non-volatile memory is typically used for
    the task of secondary storage due to its lower write performance. For
    this reason, nonvolatile memory is often used with DRAM. However,
    modern systems employing non-volatile memory- based main memory
    experience unexpected performance degradation due to the complicated
    memory microarchitecture.

    To enable both data and execution persistent in legacy systems, it
    is necessary to transfer the data from the volatile memory to the
    non-volatile memory.

    Checkpointing is one possible solution. It periodically transfers the
    data in preparation for a sudden power failure. While this technology
    is essential for ensuring high mobility and reliability for users, checkpointing also has fatal drawbacks. It takes additional time and power
    to move data and requires a data recovery process as well as restarting
    the system.

    In order to address these issues, the research team developed a processor
    and memory controller to raise the performance of non-volatile memory-only memory.

    LightPC matches the performance of DRAM by minimizing the internal
    volatile memory components from non-volatile memory, exposing the
    non-volatile memory (PRAM) media to the host, and increasing parallelism
    to service on-the-fly requests as soon as possible.

    The team also presented operating system technology that quickly makes execution states of running processes persistent without the need for a checkpointing process. The operating system prevents all modifications to execution states and data by keeping all program executions idle before transferring data in order to support consistency within a period much
    shorter than the standard power hold-up time of about 16 minutes. For consistency, when the power is recovered, the computer almost immediately revives itself and re- executes all the offline processes immediately
    without the need for a boot process.

    The researchers will present their work (LightPC: Hardware and
    Software Co- Design for Energy-Efficient Full System Persistence) at the International Symposium on Computer Architecture (ISCA) 2022 in New York
    in June.


    ========================================================================== Story Source: Materials provided by The_Korea_Advanced_Institute_of_Science_and_Technology_ (KAIST). Note:
    Content may be edited for style and length.


    ==========================================================================


    Link to news story: https://www.sciencedaily.com/releases/2022/04/220425104703.htm

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