CN113886334A - Method, system and storage medium for operating archived file using virtual file handle - Google Patents
Method, system and storage medium for operating archived file using virtual file handle Download PDFInfo
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- CN113886334A CN113886334A CN202111187601.4A CN202111187601A CN113886334A CN 113886334 A CN113886334 A CN 113886334A CN 202111187601 A CN202111187601 A CN 202111187601A CN 113886334 A CN113886334 A CN 113886334A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/14—Details of searching files based on file metadata
- G06F16/148—File search processing
- G06F16/152—File search processing using file content signatures, e.g. hash values
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/12—Replacement control
- G06F12/121—Replacement control using replacement algorithms
- G06F12/123—Replacement control using replacement algorithms with age lists, e.g. queue, most recently used [MRU] list or least recently used [LRU] list
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/172—Caching, prefetching or hoarding of files
Abstract
A method, system and storage medium for operating archived files using virtual file handles, the method comprising: accessing the archived file to acquire a corresponding archived file handle value; detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, locking the archived file for use if the archived file is in the open state, and counting the number of the opened archived files if the archived file is in a non-open state; detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files, setting a handle value and locking the handle value for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use; and after the file handle is used, unlocking the file handle under the condition of not closing the file handle. The invention adopts a file handle buffering mode to manage the virtual file handle, and ensures the normal operation of the archived file.
Description
Technical Field
The invention belongs to the technical field of real-time database file operation, and particularly relates to a method, a system and a storage medium for operating archived files by using virtual file handles.
Background
According to the production requirements of industrial enterprises, a real-time database generally needs to store data acquired in the production process in a plurality of archived files in a limited time range or occupied space, and a user calls historical data in the archived files through a client or other visual platforms, so that the data of the production process can be clearly monitored, the trend of production indexes is shown, and a large amount of data can be extracted for data analysis. As time goes on, the archive size of the real-time database is also increased, and archive files of several years or even a decade can be stored, and the number of the files can reach thousands.
The current operating system provides that the maximum number of handles held by a single process is generally 1024 or 2048, the archiving service of the real-time database is no exception, the handles required to be occupied by some necessary operations are removed, and the remaining handles can be used as file handles up to about 2000. After the number of the archived files exceeds 2000, the existing handle number is not enough to support the operation of all the files, and corresponding measures are needed to ensure that the service operates normally. In the prior art, a method of expanding the number of handles is mostly adopted to satisfy a larger number of file operations, but the set number needs to be configured when the real-time database is installed, and the archive scale of the real-time database is difficult to estimate, so that the design has disadvantages. There is also a method of dynamically increasing the number of handles, and initially using the number specified by the system, and expanding the number after exceeding the specified size, but this method also has problems: if the number of process handles is extended all the time, the response speed of the system is affected after a certain number of process handles is reached, the performance of the real-time database is reduced, the process crash can be seriously caused, and the service cannot work normally, so the design has certain defects.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a method, a system, and a storage medium for operating an archived file using a virtual file handle, wherein the virtual file handle is managed in a file handle buffering manner, so that normal operation of the archived file is guaranteed without affecting system performance.
In order to achieve the purpose, the invention has the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for operating an archived file by using a virtual file handle, including the following steps:
accessing the archived file to acquire a corresponding archived file handle value;
detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, and if the handle value of the archived file is not an invalid value, determining that the archived file is an opened file; if the archived file is in an open state, locking the archived file for use, adding one to the number of the opened archived files, and if the archived file is in a non-open state, counting the number of the opened archived files;
detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files in the non-opened state, setting a handle value and locking the archived files for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use;
and after the file handle is used, unlocking the file handle under the condition of not closing the file handle.
As a preferred scheme of the method, the handle of the archived file is acquired through a Hash table, the Hash table manages the object of the handle of the file, virtually all file names and file handles are virtualized, the open state is judged or changed through the handle of the file, and the access is carried out through the file names corresponding to the archived file.
As a preferable scheme of the method, the locking operation adds a read lock when accessing the file object, and only adds a write lock when adding, deleting and multiplexing the file.
As a preferred scheme of the method of the present invention, the list uses an LRU algorithm to record all opened file handles, specifically, a new file handle is added to the head of the table, and the last file handle is recorded at the tail of the table, so that the accessed file handle is adjusted to the head of the table.
As a preferred scheme of the method of the invention, for the file handle which is accessed for many times, an adjustment time interval is set, and the sequence of the file handle in the list is adjusted when the adjustment time interval is exceeded.
As a preferred scheme of the method, the invalid value of the handle value is a binary complement of-1, 0 xffffffffff.
As a preferred solution of the method of the present invention, the accessing the archived file includes the following operations performed on the file: file open, file close, file write, file read.
In a second aspect, an embodiment of the present invention further provides a system for operating an archived file using a virtual file handle, including:
the file access module is used for accessing the archived files and acquiring corresponding archived file handle values;
the file state detection module is used for detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, and if the handle value of the archived file is not an invalid value, the archived file is an opened file; if the archived file is in an open state, locking the archived file for use, adding one to the number of the opened archived files, and if the archived file is in a non-open state, counting the number of the opened archived files;
the file handle allocating module is used for detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files in the non-opened state, setting a handle value and locking the handle value for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use;
and the unlocking module is used for carrying out unlocking processing on the condition of not closing the file handle after the file handle is used.
In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method for operating an archived file by using a virtual file handle.
Compared with the prior art, the first aspect of the invention has at least the following beneficial effects:
generally, a file handle handles an archive file, but the number of archive files is greater than the number of file handles defined by the system, so that at the beginning of accessing a file, the system-defined handles may be still idle, but as the number of access files increases, all handles may be open, and then accessing an unopened file requires closing the handle that has not been used for the longest time to handle the unopened archive file. When accessing archived files, the file handle buffer pool is set, all accesses access files really by acquiring virtual file handles, and when facing mass archived files, a small number of handles are effectively utilized to dynamically use a large number of files, so that system resources are saved to a great extent, the normal function of a real-time database is ensured under the condition of not expanding the number of handles, the service performance is ensured not to be reduced while the archived files are continuously increased, and the stability of the system is enhanced.
Furthermore, the virtual file handle acquisition and return are optimized, the handle is held for a long time for the frequently accessed hot files, the arrangement in the list cannot be adjusted every time, and the use efficiency is improved; and for the file handle at the tail of the list, the file handle is not accessed for a long time, and after the list is full, new access is performed, and then handle returning and reacquisition are performed, so that all file handles are fully utilized.
It is to be understood that, the beneficial effects of the second to third aspects may be referred to the related description of the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flowchart of a method for operating on an archived file using a virtual file handle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a virtual file handle management and control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Referring to fig. 1, the present invention provides a method for operating an archived file using a virtual file handle, including the following steps:
s1: accessing the archived file and acquiring a corresponding archived file handle;
access to an archived file includes a series of operations on the file: file open (fopen), file close (fclose), file write (fwrite), file read (fread), etc., the access process need only provide the file name to the outside.
The method comprises the steps that an archived file handle is obtained through a Hash table, the Hash table manages file handle objects, all file names and file handles are virtualized, the opening state is judged or changed through the file handles, and when a file is not opened, the file handles are invalid values and are generally binary complement codes of-1, namely 0 xfffffffff; the access is carried out by the file name corresponding to the archived file, and the file name can directly correspond to the corresponding archived file.
S2: detecting whether the acquired archived file is in an open state, and if so, directly locking the archived file for use; if not, counting the number of opened files;
the locking operation is used to ensure the security of file access, generally, when a file handle is used to access a file object, a read lock is added, and only when a file is added, deleted or multiplexed, a write lock is added. And after the file handle is used, carrying out unlocking operation.
The opened files are judged through the virtual file handle value, if the virtual file handle value is not an invalid value, the virtual file handle value is the opened files, and the number of the opened files is increased by one.
S3: detecting whether the counted number exceeds the limited file handle number, if not, directly opening the file, setting a handle value and locking for use; if yes, recording all opened file handles in a list, closing the file handle which is least used recently, releasing resources, opening a new file handle, locking and providing use;
the list adopts an improved LRU algorithm, namely a least-used elimination algorithm, a new file handle is added to the head of the list, the tail of the list is a file handle which is not used for the longest time, the accessed file handle is adjusted to the head of the list, and the sequence of the file handle which is accessed again frequently does not need to be adjusted every time. Because a frequently accessed file handle is generally at the front end of the list, resources are wasted when adjustment is performed each time, an adjustment time interval is set, and adjustment is performed after the time interval is exceeded.
S4: and after the file handle is used, virtually closing the file handle, namely not closing the file handle and only performing unlocking processing.
The used file handle is probably used after a period of time or even soon, and the general bit is arranged at the front end of the LRU list, so that the file state is still open when the file is accessed again after the handle is virtually closed, and the file can be directly used. Resources may be released directly only when a large amount of access, such as a large access time range of a piece of historical data, needs to open many archived files. In this case, although the virtual file handle switching time is longer than the physical file handle, the overall performance is better than the handle number directly extended.
The invention verifies in the History archive Module in Ruitang real-time database system that the system process allows the maximum number of file handles to be opened of 2048, 48 of which are reserved as processes and 2000 of which are used as file handles. When the file management scale is more than 10000, the virtual file handle is adopted to operate the archived file, so that the system performance reduction caused by the expansion of the system handle number along with the increase of the number of the archived files can be avoided. In practical application, a file access system is improved, file access operation is internally converged into 'acquiring a handle, using the handle and returning the handle', and the external user-oriented operation is also the operation on all archived files, and the functions and the performance of a real-time database are ensured.
For example: the user needs to query historical data of several measuring points when accessing the real-time database, wherein the time is between 2020/01/01 and 2020/12/31, the data of one year generally corresponds to 365(366) archived files (one archived file time interval is generally one day), and 365 files need to be opened at one time. Searching corresponding file names in the hash table through the time interval, obtaining corresponding file handles, and directly locking the files through the file handles if the file handles are not invalid values (-1 or 0); if the file is an invalid value, the file is in an unopened state, the file handle needs to be allocated virtually at the moment, the opened file is counted through the file handle value, and if the file handle value does not reach 2000, the file handle is directly set and locked for use; if the LRU list has reached 2000, the file handle is closed from the end of the list, the file handle is set for the remaining files to be accessed, and the head of the LRU list is added and locked for use. When the query is finished, all file handles are virtually closed, the file handles still exist in the LRU list, and the file handles are waited to be continuously accessed next time or replaced by new file accesses after a period of time.
Referring to fig. 2, the virtual file handle management and control system according to the embodiment of the present invention includes:
m1: a file access module for performing a series of operations on a file: file open (fopen), file close (fclose), file write (fwrite), file read (fread), etc., as external use. And the file handle is not really controlled, the user can access the file by providing the file name, and the file name and the handle object are managed through the Hash table.
M2: the handle buffer module is used for managing file handle objects, namely a file handle buffer pool, and comprises an LRU list as internal control. The file handle acquisition is virtualized, the file is really accessed by acquiring the virtual handle through the file name and is inserted into the LRU head, the handle is virtually returned after the access is finished, and the file handle is released after being eliminated at the tail of the LRU list.
Another embodiment of the present invention further provides a system for operating an archived file using a virtual file handle, including:
the file access module is used for accessing the archived files and acquiring corresponding archived file handle values;
the file state detection module is used for detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, and if the handle value of the archived file is not an invalid value, the archived file is an opened file; if the archived file is in an open state, locking the archived file for use, adding one to the number of the opened archived files, and if the archived file is in a non-open state, counting the number of the opened archived files;
the file handle allocating module is used for detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files in the non-opened state, setting a handle value and locking the handle value for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use;
and the unlocking module is used for carrying out unlocking processing on the condition of not closing the file handle after the file handle is used.
Yet another embodiment of the present invention further provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method for operating an archived file using a virtual file handle.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored on a computer-readable storage medium and executed by the processor to perform the steps of the method of the present invention for operating on archived files using virtual file handles. The one or more modules/units may be a series of computer-readable instruction segments capable of performing certain functions, which are used to describe the execution of the computer program in the server.
The server can be a notebook computer, a desktop computer, a cloud server and other computing devices. The server may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the server may also include more or fewer components, or some components in combination, or different components, e.g., the server may also include input output devices, network access devices, buses, etc.
The Processor may be a CentraL Processing Unit (CPU), other general purpose Processor, a DigitaL SignaL Processor (DSP), an AppLication Specific Integrated Circuit (ASIC), an off-the-shelf ProgrammabLe Gate Array (FPGA) or other ProgrammabLe logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the server, such as a hard disk or a memory of the server. The memory may also be an external storage device of the server, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure DigitaL (SD) Card, a FLash memory Card (FLash Card), or the like provided on the server. Further, the memory may also include both an internal storage unit of the server and an external storage device. The memory is used to store the computer readable instructions and other programs and data needed by the server. The memory may also be used to temporarily store data that has been output or is to be output.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the method embodiment, and specific reference may be made to the part of the method embodiment, which is not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A method for operating an archived file using a virtual file handle, comprising the steps of:
accessing the archived file to acquire a corresponding archived file handle value;
detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, and if the handle value of the archived file is not an invalid value, determining that the archived file is an opened file; if the archived file is in an open state, locking the archived file for use, adding one to the number of the opened archived files, and if the archived file is in a non-open state, counting the number of the opened archived files;
detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files in the non-opened state, setting a handle value and locking the archived files for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use;
and after the file handle is used, unlocking the file handle under the condition of not closing the file handle.
2. The method of claim 1, wherein the handle of the archived file is obtained through a Hash table, the Hash table manages file handle objects, virtually all file names and file handles are determined or changed in an open state through the file handles, and the archived file is accessed through the file names.
3. The method of claim 1, wherein the locking operation adds a read lock when accessing the file object and adds a write lock only when adding, deleting, or reusing the file.
4. The method of claim 1, wherein the list records all open file handles using LRU algorithm, and specifically, adds a new file handle to the head of the table, and records the least used file handle at the end of the table, so that the accessed file handle is adjusted to the head of the table.
5. The method of claim 4, wherein an adjustment interval is set for the file handle accessed multiple times, and the order of the file handle in the list is adjusted when the adjustment interval is exceeded.
6. The method of claim 1, wherein the invalid value of the handle value is a binary complement of-1, 0 xffffffffff.
7. The method for operating an archive file using a virtual file handle according to claim 1, wherein said accessing the archive file comprises performing the following operations on the file: file open, file close, file write, file read.
8. A system for operating on archived files using virtual file handles, comprising:
the file access module is used for accessing the archived files and acquiring corresponding archived file handle values;
the file state detection module is used for detecting whether the accessed archived file is in an open state or not according to the handle value of the archived file, and if the handle value of the archived file is not an invalid value, the archived file is an opened file; if the archived file is in an open state, locking the archived file for use, adding one to the number of the opened archived files, and if the archived file is in a non-open state, counting the number of the opened archived files;
the file handle allocating module is used for detecting whether the number of the opened archived files exceeds the number of file handles, if not, opening the archived files in the non-opened state, setting a handle value and locking the handle value for use; if so, recording all opened file handles in a list, closing the file handle which is least used, releasing the file handle, opening a new file handle and locking the new file handle for use;
and the unlocking module is used for carrying out unlocking processing on the condition of not closing the file handle after the file handle is used.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method for operating an archived file using a virtual file handle according to any one of claims 1 to 7.
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| CN115794750A (en) * | 2023-02-07 | 2023-03-14 | 北京卡普拉科技有限公司 | Method, device and equipment for controlling opening/closing of asynchronous I/O system file |
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| CN115794750A (en) * | 2023-02-07 | 2023-03-14 | 北京卡普拉科技有限公司 | Method, device and equipment for controlling opening/closing of asynchronous I/O system file |
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