公开(公告)号：US20230110566A1

公开(公告)日：2023-04-13

申请号：US17938654

申请日：2022-10-06

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Baik-Song AN ,  Hong-Yeon KIM ,  Sang-Min LEE ,  Myung-Hoon CHA

IPC: G06F3/06

Abstract: Disclosed herein are a synchronization method for improving the concurrent read performance of a critical section in distributed shared memory and an apparatus for the same. The synchronization method, performed by a distributed-shared-memory management apparatus in a physical node of a multi-node system, includes checking whether a lock is held on each node based on a read-write lock having lock variables for respective nodes in a distributed shared memory environment, acquiring a lock for a read operation or a write operation in consideration of whether a lock is held on each node, and releasing the lock based on the lock variables for the respective nodes when the read operation or the write operation is terminated.

公开(公告)号：US20200319939A1

公开(公告)日：2020-10-08

申请号：US16836246

申请日：2020-03-31

Applicant: Electronics and telecommunications research institute

Inventor： Kang-Ho KIM ,  Kwang-Won KOH ,  Hong-Yeon KIM ,  Baik-Song AN ,  Sang-Min LEE

IPC: G06F9/52 ,  G06F9/38 ,  G06F9/30 ,  G06F9/50

Abstract: Disclosed herein are a distributed system and a method for operating the distributed system. The method for operating a distributed system including a server and multiple clients includes acquiring, by a first client of the multiple clients, a lock on a shared resource using a first table of the server and a second table of the client, and releasing, by the first client, a lock on the shared resource using the first table and the second table, wherein the first table is a lock (DSLock) table for storing information about a distributed shared resource, and the second table is a data structure (DSLock node) table for a lock request.

公开(公告)号：US20180307638A1

公开(公告)日：2018-10-25

申请号：US15895752

申请日：2018-02-13

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Ki-Sung JIN ,  Young-Kyun KIM ,  Hong-Yeon KIM ,  Sang-Min LEE

IPC: G06F13/28 ,  G06F3/06 ,  G06F17/30 ,  H04L29/08 ,  G06F9/54

CPC classification number: G06F13/28 ,  G06F3/0643 ,  G06F3/0659 ,  G06F9/544 ,  G06F9/545 ,  G06F16/1824 ,  G06F16/188 ,  H04L67/1097

Abstract: Disclosed herein are a method and system for supporting user-level DMA I/O in a distributed file system environment. The system includes a DMA I/O library located in a user space and configured to process data-processing requests of an application using a control channel or a data channel, a distributed file system client process located in the user space and configured to process data while communicating with a remote distributed storage cluster, a VFS located in a kernel space, and a FUSE kernel module located in the kernel space, wherein the control channel is a path along which the DMA I/O library and the distributed file system client process are connected to each other through the VFS and the FUSE kernel module, and wherein the data channel is a path along which the DMA I/O library and the distributed file system client process are directly connected to each other.

公开(公告)号：US20230168924A1

公开(公告)日：2023-06-01

申请号：US17898686

申请日：2022-08-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Myung-Hoon CHA ,  Hong-Yeon KIM ,  Baik-Song AN ,  Sang-Min LEE

IPC: G06F9/48 ,  G06F9/38 ,  G06F9/52

CPC classification number: G06F9/4881 ,  G06F9/3871 ,  G06F9/52

Abstract: Disclosed herein are an apparatus for preloading data in a distributed computing environment and a method using the same. The method includes selecting a local preloading target that each of multiple computers connected over a network is to preload into the local memory thereof, registering a local preloading task corresponding to the local preloading target in local preloading metadata, and asynchronously starting the local preloading task at a preset time based on the local preloading metadata. The local preloading metadata is stored in a page other than the page in which remote preloading metadata for managing a remote preloading task is stored.

公开(公告)号：US20220147462A1

公开(公告)日：2022-05-12

申请号：US17524441

申请日：2021-11-11

Applicant: Electronics and Telecommunications Research Institute

Inventor： Baik-Song AN ,  Hong-Yeon KIM ,  Sang-Min LEE ,  Myung-Hoon CHA

IPC: G06F12/0891 ,  G06F12/0882 ,  G06F3/06 ,  G06F9/455

Abstract: Disclosed herein are a hybrid memory management apparatus and method for an many-to-one virtualization environment. The hybrid memory management apparatus is implemented in an inverse-virtualization-based multi-node computing system including multiple physical nodes, each containing hybrid memory in which DRAM and NVRAM coexist, a virtual machine, and hypervisors, and includes memory for storing at least one program, and a processor for executing the program, wherein the program includes a remote request service module for processing a page-related request with reference to the hybrid memory and responding to the page-related request by transmitting a result of processing, an internal request service module for processing an internal page fault request with reference to a hybrid memory and responding to the internal page fault request, and a data arrangement module for responding to an inquiry request for a location at which a newly added page is to be arranged in the hybrid memory.

公开(公告)号：US20190155922A1

公开(公告)日：2019-05-23

申请号：US16176809

申请日：2018-10-31

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Young-Chang KIM ,  Young-Kyun KIM ,  Hong-Yeon KIM ,  Jeong-Sook PARK ,  Joon-Young PARK

IPC: G06F17/30 ,  G06F3/06

Abstract: Disclosed herein are a server for a torus network-based distributed file system and a method using the server. A management server includes a system information storage unit for storing system information of a torus network-based distributed file system, a system management unit for managing one or more metadata servers that store metadata of files and multiple data servers that are included in the torus network to distribute and store data, and a communication unit for communicating with a switch connected from a first plane in the torus network or from outside the torus network to a client, and communicating with the metadata servers and the data servers.

公开(公告)号：US20180322142A1

公开(公告)日：2018-11-08

申请号：US15941962

申请日：2018-03-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Sang-Min LEE ,  Young-Kyun KIM ,  Hong-Yeon KIM

IPC: G06F17/30

CPC classification number: G06F17/30203 ,  G06F17/30106 ,  G06F17/30117

Abstract: Disclosed herein are a metadata server and a method for distributing metadata in units of directories using the metadata server. The method includes receiving a request for at least one of creation, deletion and retrieval from a user file system; acquiring an inode corresponding to an identifier of a parent inode, which is included in the request; searching the parent inode for a dentry corresponding to the request when the request is a request to create a directory; selecting a secondary metadata server in which a new directory is to be created in order to distribute metadata in units of directories; requesting the selected secondary metadata server to create an inode; receiving an identifier of the created inode from the secondary metadata server; and adding a new dentry to the parent inode using the identifier of the inode.

公开(公告)号：US20160301754A1

公开(公告)日：2016-10-13

申请号：US15010373

申请日：2016-01-29

Applicant: Electronics and Telecommunications Research Institute

Inventor： Sang-Min LEE ,  Young-Kyun KIM ,  Hong-Yeon KIM

IPC: H04L29/08 ,  H04L12/803 ,  H04L12/24

CPC classification number: H04L67/1097 ,  G06F17/30067 ,  H04L41/12 ,  H04L41/5041

Abstract: Disclosed herein is a distributed file system using a torus network. The distributed file system may include multiple servers. The multiple servers are connected with each other through an n-dimensional torus network, and each of the multiple servers may be arranged along n-dimensional axes. Among the servers in the distributed file system, a server group of an (n−1)-dimensional torus network may be connected to a public network. Different loads of the distributed file system may be distributed based on the axes. Through the distribution, the processing performance of the distributed file system may be improved.

Abstract translation: 这里公开了使用环面网络的分布式文件系统。 分布式文件系统可以包括多个服务器。 多个服务器通过n维环面网络彼此连接，并且多个服务器中的每一个可以沿着n维轴排列。 在分布式文件系统的服务器中，（n-1）维环网的服务器组可以连接到公共网络。 可以基于轴分布不同分布式文件系统的负载。 通过分发，可以提高分布式文件系统的处理性能。

公开(公告)号：US20130297969A1

公开(公告)日：2013-11-07

申请号：US13864685

申请日：2013-04-17

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Young-Chang KIM ,  Hong-Yeon KIM ,  Wan CHOI

IPC: G06F17/30 ,  G06F11/14

CPC classification number: G06F16/1844 ,  G06F11/2094 ,  G06F11/2097 ,  G06F11/3409 ,  G06F11/3485 ,  G06F16/172 ,  G06F16/182 ,  G06F2201/81

Abstract: The present invention relates to a method of improving file write performance and providing availability in a hybrid storage system. When a file writing target server information request signal is received from a client, any one cache server is selected in consideration of storage spaces of cache servers, information about the selected cache server to the client is transmitted so that the client stores the file in the selected cache server. When a duplicate writing target server information request is received from the selected cache server, any one first data server is selected in consideration of storage spaces of respective data servers, information about the selected first data server is transmitted to the cache server so that the cache server stores a duplicate of the file in the first data server. Information about storage of the file and the duplicate is received, and then file metadata is stored.

Abstract translation: 本发明涉及一种在混合存储系统中提高文件写入性能并提供可用性的方法。 当从客户端接收到文件写入目标服务器信息请求信号时，考虑到缓存服务器的存储空间来选择任何一个缓存服务器，发送关于所选择的高速缓存服务器到客户端的信息，以便客户端将文件存储在 选择缓存服务器。 当从所选择的高速缓存服务器接收到重复的写入目标服务器信息请求时，考虑到各个数据服务器的存储空间来选择任何一个第一数据服务器，关于所选择的第一数据服务器的信息被发送到高速缓存服务器，使得缓存 服务器将文件的副本存储在第一个数据服务器中。 接收到关于文件和副本的存储的信息，然后存储文件元数据。