Method and apparatus for starting application program

Abstract

The present invention, pertaining to the field of computer technologies, discloses an application startup method and apparatus. The method includes: loading, upon receiving an instruction for starting up an application program, prefetch data corresponding to the application program, where the prefetch data includes at least one file block corresponding to at least one page fault occurred during a history startup process of the application program; and loading code of the application program to start up the application program. The apparatus includes: a prefetch data loading module and a code loading module. According to the present invention, the number of page faults occurred during the startup process of the application program because a process cannot be mapped to a valid physical page when accessing a virtual page is greatly reduced. Further, since before the code of the application program is loaded, instead of all file blocks during the initial startup of the application program, only the file block(s) corresponding to page fault(s) is loaded, frequent memory page flipping and file flipping during the loading process of the application program are mitigated, and startup speed and startup efficiency of the application program are improved.

Description

technical field [0001] The invention relates to the field of computers, in particular to a method and device for starting an application program. Background technique [0002] With the rapid development of computer technology, users will install various applications. The disk I / O during the application startup process is basically introduced by Page Fault. When it is executed somewhere and its corresponding When the virtual address of the process is not in the working set (Working Set) of the process, Page Fault will occur. The order of Page Fault is generally like this: some pages are read from a certain part of a file, and then some pages may be read from a distance from the same file. Read some pages from another part farther away, then read some pages from a different file, possibly read pages from a directory, and then read some pages from the first file, read The file is discontinuous, and the reading position may also be discontinuous. This jumpy reading greatly slow...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of computer technology, users will install various applications. The disk I / O during the application startup process is basically introduced by Page Fault. When it is executed somewhere and its corresponding When the virtual address of the process is not in the working set (Working Set) of the process, Page Fault will occur. The order of Page Fault is generally like this: some pages are read from a certain part of a file, and then some pages may be read from a distance from the same file. Read some pages from another part farther away, then read some pages from a different file, possibly read pages from a directory, and then read some pages from the first file, read The file is discontinuous, and the reading position may also be discontinuous. This jumpy reading greatly slows down the speed of starting the application every time. If the corresponding content is not in the physical memory, it needs to be read from the file and trigger Hard Fault, one of the main reasons for the long cold start time of the application is that there are too many Hard Faults

The Hard Fault is read on demand (16KB or 32KB at a time), and considering other I / O of the system, it may cause the I / O offset to jump on the disk, thus greatly slowing down the speed of each access. The speed reduces the startup efficiency of the application, and the startup speed is one of the most important performance indicators of the application, which directly affects the user's impression of the application experience

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