KR102156313B1 - Cloud file download apparatus and method - Google Patents

Abstract

The present invention relates to a cloud file download device and method for improving the execution speed when executing the cloud file by optimizing the download speed of cloud files such as media or applications installed in a cloud storage on a network, and an aspect of the present invention The cloud file download method according to the method is a method performed by the user terminal when an application installed in a Virtual File System (VFS)-based cloud storage is requested through an OS (Operating System) of the user terminal, and (a) a cloud file from VFS Receiving a request for a file fragment having a variable size for And (b) requesting and downloading a file block of a fixed size preset for the cloud file instead of the requested variable sized file fragment, from the cloud storage, wherein step (b) (b-1) setting the number of sessions to be available to a plurality; (b-2) allocating a plurality of fixed-size file blocks to the set plurality of sessions, respectively; And (b-3) downloading each of the allocated plurality of fixed sized file blocks through the allocated plurality of sessions.

Description

Cloud file download device and method {CLOUD FILE DOWNLOAD APPARATUS AND METHOD}

The present invention relates to a technology for downloading files such as media or applications (hereinafter, abbreviated as cloud files) stored in a cloud storage on a network from a user terminal, and more specifically, a cloud storage area on a network. It relates to an apparatus and method for improving the download speed of a cloud file in a user terminal that can be recognized as an external memory.

Virtual File System (VFS) is an abstract layer above the actual file system. The purpose of VFS is to allow client applications (or applications) to access multiple file systems in the same way. For example, with VFS, the client application does not feel the difference between local and network because it can directly access local storage devices and storage devices on the network (or cloud storage). In addition, it can be accessed without feeling the difference in the file system beyond the difference in the operating system (OS) such as Microsoft Windows, Mac OS, and Unix.

VFS defines the interface or specification between the kernel and the actual file system. Therefore, you can simply add a new file system to the kernel according to the specification. The file system may need to be modified or recompiled for compatibility with new public versions. Or, if the operating system operates in backward compatibility mode for standard changes, each file system can be used in the new version of the operating system.

However, in the past, when a smartphone terminal that provides a cloud service as a virtual file system and provides it as an external memory area requests execution of files such as media and applications stored in the cloud area (i.e., cloud files), the corresponding cloud file is 4Kbytes to 1024Kbytes. Since it is downloaded and executed as a variable fragment file, the VFS area of the terminal frequently requests the file fragment of the cloud file in small units, which results in execution speed compared to storing media files in a physical external storage device such as an SD card. There was a problem in that the phenomenon of significantly slowing down occurs.

Public Patent Publication No. 10-2013-0064292 (published on June 18, 2013)

The present invention is to solve the above-described conventional problem, the purpose of which is to optimize the download speed of files (i.e., cloud files) such as media or applications installed in the cloud storage on the network to increase the execution speed when executing the cloud file. To improve, to provide a cloud file download device and method.

In order to achieve the above object, the cloud file download apparatus according to an aspect of the present invention is included in the user terminal for accelerating execution of a VFS (Virtual File System)-based cloud file through an operating system (OS) of the user terminal. A cloud file download device comprising: a file fragment request receiver for receiving a request for a file fragment of a variable size for a cloud file from a VFS; And a download unit for requesting and downloading a file block of a fixed size preset for the cloud file instead of the requested variable sized file fragment from the cloud storage, wherein the download unit is the number of sessions to be available. A session defining unit for setting a plurality of values; A session allocator for allocating a plurality of fixed sized file blocks to the set plurality of sessions; And a download performing unit for downloading each of the allocated plurality of fixed sized file blocks through the allocated plurality of sessions, and the session allocating unit may include the plurality of Each of the fixed sized file blocks may be sequentially allocated according to the order of the requested file fragments, and the allocated plurality of fixed sized file blocks may include file blocks of different cloud files.

In order to achieve the above object, the cloud file download method according to another aspect of the present invention is, when a request for execution of an application installed in a Virtual File System (VFS)-based cloud storage through an OS (Operating System) of the user terminal is requested, the user terminal As a method of performing in, (a) receiving a request for a file fragment of a variable size for a cloud file from VFS; And (b) requesting and downloading a file block of a fixed size preset for the cloud file instead of the requested variable sized file fragment, from the cloud storage, wherein step (b) (b-1) setting the number of sessions to be available to a plurality; (b-2) allocating a plurality of fixed-size file blocks to the set plurality of sessions, respectively; And (b-3) downloading each of the allocated plurality of fixed-size file blocks through the allocated plurality of sessions, and the step (b-2) includes the set plurality of sessions ( The plurality of fixed-size file blocks may be sequentially allocated to each of the plurality of fixed-size file blocks according to the order of the requested file pieces, and the allocated plurality of fixed-sized file blocks are file blocks of different cloud files. Can include.

In order to achieve the above object, according to another aspect of the present invention, a computer-readable recording medium in which a program for executing the cloud file download method on a computer is recorded may be provided.

In order to achieve the above object, according to another aspect of the present invention, an application stored in a medium may be provided in order to execute the cloud file download method in combination with hardware.

In order to achieve the above object, according to another aspect of the present invention, a computer program stored in a medium may be provided in order to execute the cloud file downloading method on a computer.

As described above, according to various aspects of the present invention, when a cloud file installed in the cloud storage on the network is executed by the user terminal, the size of the fragment of the file downloaded from the cloud storage is fixed to a specific block (fixed size) to allow multiple sessions By downloading through the network, it is possible to improve the execution speed when executing the cloud file installed in the cloud storage on the network by minimizing the delay in execution time of the cloud file due to network download compared to the existing one.

1 is a configuration diagram of a communication system to which the present invention is applied,
2 is a configuration diagram of a user terminal according to an embodiment of the present invention;
3 is a configuration diagram of a cloud file download device according to an embodiment of the present invention;
4 is a configuration diagram of a download unit of a cloud file download device according to an exemplary embodiment of the present invention;
5-6 are diagrams for explaining an operation example of a download unit according to an exemplary embodiment of the present invention;
7 is a flow chart of a cloud file download method according to an exemplary embodiment of the present invention;
8 is a diagram for describing an example in which an application of a user terminal is moved to a cloud storage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to elements of each drawing, the same elements are to have the same numerals as possible even if they are indicated on different drawings. In addition, when it is determined that a detailed description of a known configuration or function related to an embodiment of the present invention may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

1 is a block diagram of a communication system to which the present invention is applied, and as shown in the drawing, a communication network 1, a user terminal 2, and a cloud storage 3 may be included.

The communication network 1 may be any single or complex network that enables communication between the user terminal 2 and the cloud storage 3 by wired, wireless and/or Internet connection.

The user terminal 2 is a mobile terminal device capable of at least communicating with the cloud storage 3, for example, a mobile communication terminal capable of voice communication, video communication, data communication, and Internet communication, PDA, smart phone, and It may be one of bullet PCs and the like.

The cloud storage 3 is a storage device on a communication network (or network) 1 and is a storage device that the user terminal 2 can access anytime, anywhere through the communication network 1.

In the embodiment of the present invention, the user terminal 2 is an APK in the internal memory of the user terminal 2 when the application is not compiled with the option of internal only as shown in FIG. 8. It is possible to extract the SO file from the (Android application Package) file, encrypt it with ASEC, and move it to the external memory area.In this case, if the external memory area is allocated as cloud storage (3) on the network (1), the ASEC file is cloud storage It is stored in (3), and the user terminal 2 downloads and executes the corresponding application (ie, cloud file) stored (installed) in the cloud storage 3.

In the present invention, the execution speed of a cloud file (application) was analyzed as follows for a case of requesting a file download from a cloud storage using an SMB or NFS protocol from an existing user terminal.

In the existing user terminal, VFS variably requests and downloads a file fragment in units of 4Kbytes to 1024Kbytes according to the SMB or NFS protocol.For example, a cloud file in which the executable file is moved to the cloud storage area 3 as shown in FIG. When (Application) is executed, the VFS area of the existing Android-based user terminal frequently requests fragments of ASEC files in small units, and depending on the cloud file (application), it is stored in a physical external storage device such as an SD card. Compared to the saved ASEC file, the execution speed is greatly slowed down.

Table 1 below shows the results of measuring the speed delay when 10 Android applications are moved from the internal memory of the user terminal to the cloud storage area and when they are moved to the SD memory card. For fairness of measurement, the same terminal was connected to the LTE network (N/W) and the location was moved equally to measure. According to Table 1 below, although there are variations for each application, it can be seen that the execution speed is significantly slowed when the cloud storage area is moved compared to the SD card.

number Application move
Size (M) SD card execution speed (sec) Cloud execution speed (sec) Download count Download capacity (M) One App A 13 2.442 4.544 71 10.2 2 App B 58 9.369 24.316 423 41.73 3 App C 11 4.766 8.415 84 7.8 4 App D 43 21.622 24.474 179 38.39 5 App E 69 17.52 26.051 265 55.14 6 App F 12 2.848 4.305 72 8.77 7 App G 67 15.882 25.111 204 42.56 8 App H 41 18.34 22.116 109 25.61 9 App I 9 1.478 1.976 45 6.01 10 App K 30 4.566 5.697 80 10.83

Table 2 below compares how much slower 10 Android applications are when they are moved to the cloud storage area compared to when they are moved to SD memory. According to Table 2, in proportion to the total size of the application, it can be seen that the smaller the average size requested and downloaded once from the Linux VFS while the application is running, the higher the execution delay.

number Application Move size (M) Download count Download capacity (M) 1 download
Size (M) Execution delay One App A 13 71 10.2 0.143661972 86% 2 App B 58 423 41.73 0.098652482 160% 3 App C 11 84 7.8 0.092857143 77% 4 App D 43 179 38.39 0.214469274 13% 5 App E 69 265 55.14 0.208075472 49% 6 App F 12 72 8.77 0.121805556 51% 7 App G 67 204 42.56 0.208627451 58% 8 App H 41 109 25.61 0.234954128 21% 9 App I 9 45 6.01 0.133555556 34% 10 App K 30 80 10.83 0.135375 25%

Accordingly, in an embodiment of the present invention, based on the above-described analysis content, an Android (or other OA)-based terminal provides a device and method capable of moving an APK file including execution information of an application to a cloud storage and executing it quickly.

2 is a configuration diagram of a user terminal according to an embodiment of the present invention, a detailed configuration diagram of the user terminal 2 of FIG. 1, and, as shown in the drawing, an operating system (OS) 21, a virtual device (VFS) File System) 22, a cloud file system 23, and a cloud file cache 24 may be included.

The OS 21 is an operating system installed in the user terminal 2, and in this embodiment, an Android-based OS may be used as an example.

The VFS 22 is for mediating communication between the OS 21 and the cloud file system 23 by defining an interface or standard between the kernel and the actual file system. Since the function is the same as the above-described VFS, a detailed description will be omitted.

When executing a cloud file (application) installed in the cloud storage 3 on the network 1 from the user terminal 2, the cloud file system 23 specifies a fixed sized file fragment requested from the VFS 22. It is to accelerate the execution speed of the cloud file (application) by fixing it as a block and downloading it from the cloud storage 3 through a plurality of sessions.

The cloud file cache 24 represents an internal cache area (cache storage area) of the cloud file system 23, for example, a fixed size file block downloaded from the cloud storage 3 by the cloud file system 23 May be stored as a cache file in the internal cache area 24.

3 is a configuration diagram of a cloud file download device according to an exemplary embodiment of the present invention, showing an example of a detailed configuration of the cloud file system 23 of FIG. 2, and as shown in the drawing, a file fragment request It may include a receiving unit 231, a cache inquiry unit 232, a download unit 233, a cache storage unit 234, and a file fragment providing unit 235.

The file fragment request receiving unit 231 corresponds from the VFS 22 when executing a cloud file (application) installed in the cloud storage 3 on the network 1 through the OS (Operating System) 21 of the user terminal 2 To receive a request for a file fragment of a variable size for a cloud file, for example, the file fragment request receiver 231 accesses the file by the OS 21 to the VFS 22 based on POSIX (Portable Operating System Interface). Upon request, a file fragment of variable size may be requested from the VFS 22 according to a Server Message Block (SMB) protocol or a Network File System (NFS) protocol. In this embodiment, a file fragment of variable size may be in the range of 4Kbytes to 1024Kbytes.

The cache inquiry unit 232 is for inquiring whether a cache file corresponding to a file fragment of a corresponding cloud file requested through the file fragment request receiving unit 231 exists in the cloud file cache 24 as an internal cache area.

The download unit 233 is for downloading from the cloud storage 3 a corresponding cloud file requested by the VFS 22 in units of a piece file when the corresponding cache file does not exist as a result of the cache inquiry by the cache inquiry unit 232, In particular, the cloud file requested by the VFS 22 in the unit of a piece file can be downloaded in units of a preset fixed sized file block.

In the present embodiment, the size of the preset fixed-size file block may be set to be larger than the size of the aforementioned variable-size file fragment, for example, 1024 Kbytes.

The cache storage unit 234 is for storing a fixed size file block downloaded from the cloud storage 3 through the download unit 233 in the cloud file cache 24 as an internal cache area.

The file fragment providing unit 235 is for providing the file fragment requested from the VFS 22 to the corresponding OS 21 based on the cache file stored in the cache storage unit 234, for example, the cache inquiry unit 232 If a corresponding cache file exists in the cache storage area 24, the corresponding file fragment is provided to the OS 21 based on the existing cache file, and as another example, the cache search result of the cache inquiry unit 232 If a corresponding cache file does not exist in the cache storage area 24, the corresponding file fragment may be provided to the corresponding OS 21 based on a cache file of a fixed size file block downloaded and stored as described above.

When a file is downloaded in a general LTE mobile communication environment in Korea, the actual data in TCP starts with a small window size, and gradually changes as the delay of the previous transmission speed decreases. In other words, under the premise that no abnormality occurs in the communication through-put and delay, the larger the size of the downloaded file, the faster the transmission speed as the larger data is sent in one transmission frame. . Table 3 below shows download speeds for each file size measured in an actual 3CA LTE environment. The speed was measured based on downloading from the same server to the same client.

number File size Transmission speed Download time One 1 Mbyte 6~8 MBPS About 1 second 2 2 Mbyte 10 MBPS 1.5 seconds 3 3~5 Mbyte 16 MBPS 1.5~2.5 seconds 4 10 Mbyte 24 MBPS 3.3 seconds 5 30 Mbyte 32 MBPS 7.5 seconds 6 100 Mbyte 40 MBPS About 20 seconds

As shown in Table 3, the maximum speed that can be downloaded for an actual file is 40MBPS for downloading 100Mbyte size at a time, but when 100Mbyte is defined as one block, the file system accesses the file for one operation, and the minimum before the file block is answered. A download (waiting) time of 20 seconds occurs. Accordingly, in an embodiment of the present invention, in order to maximize the download speed while minimizing user waiting time, a multi-session download method in which small blocks are simultaneously downloaded is proposed.

That is, in this embodiment, a multi-session download method in which a plurality of fixed-size block-unit files are simultaneously downloaded through a plurality of sessions is implemented, but the effect of the multi-session download is a wired network with a constant through-put. The test results are shown in Table 4 below.

number Test method Download speed One Single download of 30Mbyte files 32MBPS 2 30Mbyte file, 1M block, 1Session download 25MBPS 3 30Mbyte file 1M block 3Session download 43MBPS 4 30Mbyte file, 1M block 6Session download 46MBPS 5 30Mbyte file 1M block 9Session download 60MBPS

As shown in Table 4, when downloading a 30Mbyte file, it is possible to provide the optimal download speed when downloading a single file by splitting it into several fixed blocks and downloading it as a multi-session rather than downloading a single file.

Accordingly, in the embodiment of the present invention, in order to optimize the download speed of fixed-size blocks used in the cloud file system 23, the number of multi-sessions is predefined and requested by the VFS (abstraction file system) 22. The download speed can be optimized by assigning a block of a preset fixed size to the session instead of a variable file fragment and downloading it. It will be described in more detail below.

FIG. 4 is a configuration diagram of a download unit of a cloud file download device according to an exemplary embodiment of the present invention, showing an example of a detailed configuration of the download unit 233 of FIG. 3, and as shown in the drawing, session definition A unit 2331, a session allocating unit 2333, and a download performing unit 2335 may be included.

The session definition unit 2331 is for pre-defining the number of multi-sessions to be used, for example, a base station radio signal strength and a through-put change according to the number of simultaneous access users to one base station. You can set the number of sessions to be available as a basis.

The session allocating unit 2333 is for allocating a plurality of fixed-size file blocks to a plurality of sessions set through the session defining unit 2331, for example, in an empty area of the set Each of a plurality of fixed-size file blocks may be sequentially allocated according to the order of the requested file fragments.

For example, the session allocator 2333 allocates and uses n sessions initially (n is a number of N or less) among maximum N sessions when one file is downloaded, and then sequentially counts the number of sessions allocated when a block is requested. It can be increased by (for example, by multiplying n by a specific magnification or by adding a specific number, or by sequentially increasing by the number of blocks requested later).

The download execution unit 2335 is for downloading each of a plurality of fixed-size file blocks allocated correspondingly through a plurality of sessions allocated through the session allocator 2333. As an example, as shown in FIG. Define multiple (download) sessions and download a plurality of fixed (size) file blocks for one cloud file through the corresponding 9 multi-sessions, or as another example, the number of multi-sessions as shown in FIG. It is defined as nine, and a plurality of fixed (size) file blocks for a plurality of different (two in FIG. 6) cloud files can be downloaded through corresponding nine multi-sessions. In this embodiment, each session may be downloaded in a queue method.

5-6 are diagrams for explaining an operation example of the download unit 233 according to an exemplary embodiment of the present invention, and FIG. 5 is a maximum for downloading one single cloud file when a maximum of 9 multi-download sessions are defined. A diagram for explaining an example of a method for providing a speed, and FIG. 6 is a diagram illustrating an example of a method for providing a maximum speed for downloading several different cloud files when defined as a maximum of nine multi-download sessions It is a drawing for.

Referring to FIG. 5, the download unit 233 according to an exemplary embodiment of the present invention may use one session when requesting a block for the first time, and then continue to use up to nine sessions after downloading by increasing the number of sessions. . That is, even while the request block is being downloaded, if an additional block access request is received, the block can be downloaded using all 9 sessions.

6, the download unit 233 according to an exemplary embodiment of the present invention, in the case of applying a fixed block of 1 MB and a maximum of 9 sessions, with respect to a new cloud file download request even if the previous cloud file is being downloaded. For example, 1 session-2 sessions-4 sessions are sequentially allocated, and maximum 9 sessions can be maintained for 2 cloud files. In other words, it is possible to provide each session for several different cloud files.

According to an embodiment of the present invention, when there are fewer than 9 requested file blocks, the remaining sessions are provided for downloading the requested-on file first, and when there are 9 requested file blocks, each of the 9 sessions is allocated and downloaded. If there are more than 9 blocks, sessions can be allocated and downloaded according to the order of requests.

According to an exemplary embodiment of the present invention, the download unit 233 may implement an optimal download speed by applying a multi-session file download algorithm as shown in FIGS. 5 and 6.

7 is a flowchart of a method for downloading a cloud file according to an exemplary embodiment of the present invention, and since it is applied to the devices of FIGS. 1 to 4, it will be described in parallel with the operation of the corresponding device.

First, when the first access request to a cloud file (application) installed in the cloud storage 3 on the network 1 through the OS (Operating System) 21 of the user terminal 2, the OS 21 Operating System Interface), when requesting access to the corresponding file to VFS(22) (S711), VFS(22) is a variable sized 4Kbytes~1024Kbytes according to SMB(Server Message Block) protocol or NFS(Network File System) protocol. A file fragment is requested from the cloud file system 23 (S712).

Then, the cloud file system 23 inquires whether the cache file corresponding to the file fragment of the application requested in step S412 exists in the cloud file cache 24 as an internal cache area (S713), and corresponds to the first file access. If the cache file does not exist (S714), the cloud file (application) requested in the variable fragment file unit of 4Kbytes to 1024Kbytes from the VFS 22 is unconditionally fixed in a fixed sized file block unit of 1024Kbytes If the download is performed by assigning to one of the sessions (i.e., multi-session), but sequentially requesting access to the cloud file (application) N-1 following the initial access request, steps S711 to S714 described above are performed. If the corresponding cache file does not exist repeatedly, a request is made to the cloud storage 3 to sequentially allocate and download a plurality of fixed file blocks to a plurality of defined sessions (ie, multi-session) (S716 to S717).

Then, the cloud file system 23, in response to the download request in step S717, when a fixed-size file block of 1024 Kbytes is downloaded from the cloud storage 3 through a plurality of sessions (S718), to the cloud file cache 24. The cache file is stored (S719), and the file fragment requested from the VFS 22 is provided to the OS 21 in step S712, and the downloaded area is returned (S720).

Then, when there is an Nth access request for the cloud file (application) additionally, the OS 21 requests the VFS 22 to access the file through POSIX (Portable Operating System Interface) (S731), and VFS ( 22) requests a file fragment of a variable size of 4Kbytes to 1024Kbytes from the cloud file system 23 according to the Server Message Block (SMB) protocol or the Network File System (NFS) protocol (S732).

Subsequently, the cloud file system 23 of the user terminal 2 determines whether the cache file corresponding to the file fragment of the cloud file (application) requested in step S732 exists in the cloud file cache 24 as an internal cache area. Inquiry (S733 to S734), and if the cache file exists, the file fragment additionally requested from the VFS 22 in step S732 is provided to the OS 21 and the corresponding cache area is returned (S735), and the cache file is If it does not exist (S736), an additional 1024Kbytes of fixed-size file blocks from the cloud storage 3 are sequentially allocated to empty sessions among a plurality of defined sessions (S738) and downloaded (S739 to S740), and the cloud file cache 24 ) As a cache file (S741), and provides the file fragment additionally requested from the VFS 22 in step S732 to the corresponding OS 21 to return the downloaded area (S742).

According to the above-described embodiment of the present invention, in Table 2, the downloaded size for the application B (App.B) having a high speed delay compared to the SD card is unconditionally fixed to 1024 Kbytes and downloaded through multi-session to execute the application B. As a result of performing the simulation, it was analyzed that the execution speed of about 30-40% can be improved compared to the previous case when the simulation is fixed at 1024Kbytes and downloaded through multi-session.

Meanwhile, according to the cloud file download method described above, a computer-readable recording medium recording a program for executing the method on a computer can be implemented.

On the other hand, according to the cloud file download method described above, an application stored in a medium may be implemented in order to execute the method in combination with hardware.

On the other hand, a computer program stored in a medium may be implemented in order to execute the above-described cloud file download method on a computer.

For example, as described above, the cloud file download method according to an embodiment of the present invention may be implemented as a computer-readable recording medium including program instructions for performing operations implemented by various computers or an application stored in such a recording medium. I can. The computer-readable recording medium may include program instructions, local data files, local data structures, and the like alone or in combination. The recording medium may be specially designed and configured for the embodiment of the present invention, or may be known and usable to a person skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, flash memory, and the like. Hardware devices specifically configured to store and execute the same program instructions are included. Examples of the program instructions may include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1: communication network (or network)
2: user terminal
3: cloud storage
21: OS (Operating System)
22: Virtual File System (VFS)
23: cloud file system
24: Cloud file cache
231: file fragment request receiver
232: cache lookup unit
233: download section
234: cache storage unit
235: file fragment providing unit
2331: session definition unit
2333: session allocation unit
2335: download executive

Claims (15)

A cloud file download device included in the user terminal for accelerating execution of a VFS (Virtual File System) based cloud file through an OS (Operating System) of the user terminal,
A file fragment request receiver for receiving a request for a file fragment of a variable size for a cloud file from the VFS; And
Including; a download unit for downloading by requesting the cloud storage to download a file block of a fixed size preset for the cloud file instead of the requested variable size file fragment,
The download unit includes a session defining unit for setting the number of available sessions to a plurality; A session allocator for allocating a plurality of fixed sized file blocks to the set plurality of sessions; And a download performing unit for downloading each of the allocated plurality of fixed sized file blocks through the allocated plurality of sessions,
The session allocator initially allocates and uses n sessions (n is a number of N or less) among maximum N sessions when one cloud file is downloaded, and then increases the number of sessions allocated when a block is requested later to n or more. A cloud file download device, characterized in that sequentially increasing and using. The method of claim 1,
The session allocator sequentially allocates the plurality of fixed sized file blocks to the set plurality of sessions according to the order of the requested file fragments. The method of claim 1,
The cloud file download apparatus, characterized in that the allocated plurality of fixed-size file blocks include file blocks of different cloud files. The method of claim 1,
The file fragment request receiver receives a request for a file fragment of a variable size according to a Server Message Block (SMB) protocol or a Network File System (NFS) protocol. The method of claim 1,
The file fragment request receiving unit receives a request for a variable sized file fragment from the VFS when the OS requests access to the corresponding file from the VFS based on POSIX (Portable Operating System Interface). The method of claim 1,
The cloud file download device, characterized in that the size of the preset fixed-size file block is greater than or equal to the size of the variable-size file fragment. As a method performed by the user terminal when an application installed in a VFS (Virtual File System) based cloud storage is requested to be executed through an OS (Operating System) of the user terminal,
(a) receiving a request for a file fragment of a variable size for a cloud file from VFS; And
(b) requesting and downloading a file block of a fixed size preset for the cloud file instead of the requested variable sized file fragment from the cloud storage;
The step (b),
(b-1) setting the number of sessions to be available to a plurality;
(b-2) allocating a plurality of fixed-size file blocks to the set plurality of sessions, respectively; And
(b-3) including the step of downloading each of the allocated plurality of fixed sized file blocks through the allocated plurality of sessions,
In step (b-2), when one cloud file is downloaded, n sessions (n is a number of N or less) are initially allocated and used, and then the number of sessions allocated when a block is requested is determined. Cloud file download method, characterized in that the use of sequentially increasing n or more. The method of claim 7,
In the step (b-2), the plurality of fixed-size file blocks are sequentially allocated to the set plurality of sessions according to the order of the requested file fragments. The method of claim 7,
The cloud file downloading method, characterized in that the allocated plurality of fixed-size file blocks include file blocks of different cloud files. The method of claim 7,
The step (a) is a cloud file download method, characterized in that receiving a request for a file fragment of a variable size according to the SMB (Server Message Block) protocol or NFS (Network File System) protocol. The method of claim 7,
The step (a) is a cloud file download method, characterized in that, based on a POSIX (Portable Operating System Interface), when an OS requests a VFS to access a corresponding file, a file fragment of a variable size is requested from the VFS. The method of claim 7,
The cloud file downloading method, characterized in that the size of the fixed-size file block is set to be greater than or equal to the size of the variable-size file fragment. A computer-readable recording medium storing a program for executing the cloud file download method of claim 7 on a computer. An application stored in a medium to execute the cloud file download method of any one of claims 7 to 12 in combination with hardware. A computer program stored in a medium in order to execute the cloud file download method of any one of claims 7 to 12 on a computer.

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