CN114518991A - Method and device for counting CPU utilization rate - Google Patents
Method and device for counting CPU utilization rate Download PDFInfo
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- CN114518991A CN114518991A CN202011295305.1A CN202011295305A CN114518991A CN 114518991 A CN114518991 A CN 114518991A CN 202011295305 A CN202011295305 A CN 202011295305A CN 114518991 A CN114518991 A CN 114518991A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004590 computer program Methods 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 5
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- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
- G06F11/3452—Performance evaluation by statistical analysis
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3003—Monitoring arrangements specially adapted to the computing system or computing system component being monitored
- G06F11/3024—Monitoring arrangements specially adapted to the computing system or computing system component being monitored where the computing system component is a central processing unit [CPU]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3089—Monitoring arrangements determined by the means or processing involved in sensing the monitored data, e.g. interfaces, connectors, sensors, probes, agents
- G06F11/3093—Configuration details thereof, e.g. installation, enabling, spatial arrangement of the probes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3089—Monitoring arrangements determined by the means or processing involved in sensing the monitored data, e.g. interfaces, connectors, sensors, probes, agents
- G06F11/3096—Monitoring arrangements determined by the means or processing involved in sensing the monitored data, e.g. interfaces, connectors, sensors, probes, agents wherein the means or processing minimize the use of computing system or of computing system component resources, e.g. non-intrusive monitoring which minimizes the probe effect: sniffing, intercepting, indirectly deriving the monitored data from other directly available data
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
- G06F11/3466—Performance evaluation by tracing or monitoring
- G06F11/3476—Data logging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention provides a method and a device for counting CPU utilization rate, wherein the method comprises the following steps: after the interrupt timer is started, interrupting the operating system according to the interrupt frequency of the interrupt timer; acquiring the state of each task in the operating system at the interruption time, and counting the state of each task at each interruption time to obtain a count value; and after the interrupt timer is closed, calculating the CPU utilization rate of each task according to the interrupt frequency and the count value of each task. The invention realizes that the CPU utilization rate is counted, no additional hardware is needed, no operating system source code is needed to be modified, the system can be closed at any time, all conditions of the whole system can be covered, and the system operation and the performance are not influenced at ordinary times.
Description
Technical Field
The embodiment of the invention relates to the field of embedded software programming, in particular to a method and a device for counting CPU utilization rate.
Background
In a real-time operating system, the specific conditions of the CPU (Central Processing Unit) utilization, including the CPU utilization of each task, interrupt, and kernel, need to be known. CPU utilization is mainly used in three areas: the auxiliary real-time system reasonably designs the priority of each task to achieve the purpose of real-time schedulability; optimizing the performance: the method can help to carry out targeted analysis on the tasks occupying high CPU utilization rate and provide an optimization scheme; the situation of abnormal CPU occupancy rate caused by the design and coding problems of programmers is often encountered in engineering, and the faults can be checked by means of CPU utilization rate statistics.
However, the prior art has the following disadvantages: the CPU utilization rate is counted by adopting additional independent hardware, so that the hardware cost is increased, and the debugging field does not have operability in many times due to the need of adding a hardware device; the calculated CPU utilization rate is a physical utilization rate, and is not fine enough, so that the method has little significance for solving engineering problems. The statistical function provided by the operating system is utilized to indirectly count the CPU utilization rate, the operating system is required to provide the statistical function, if the operating system does not provide the corresponding statistical function, the source code of the operating system needs to be modified, the principle of the modified operating system needs to be deeply known, the technical difficulty is high, and the operating system is easy to be unstable and is not easy to be paid once the operating system is modified by mistake.
Therefore, it is very important to design a method for counting the CPU utilization rate with good performance and no os dependency for real-time os.
Disclosure of Invention
The embodiment of the invention provides a method and a device for counting the utilization rate of a CPU (Central processing Unit), which are used for solving the problem that the utilization rate of the CPU can not be accurately counted without dependency because additional hardware needs to be added or source codes of an operating system need to be modified when the utilization rate of the CPU is counted.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for counting a CPU utilization, including:
after the interrupt timer is started, interrupting the operating system according to the interrupt frequency of the interrupt timer;
acquiring the state of each task in the operating system at the interruption time, and counting the state of each task at each interruption time to obtain a count value;
and after the interrupt timer is closed, calculating the CPU utilization rate of each task according to the interrupt frequency and the count value of each task.
Optionally, before starting the interrupt timer, the method further includes: the interrupt frequency is set.
Optionally, the setting the interrupt frequency includes: and in a T period, floating the interrupt frequency up or down to a preset value to obtain a prime number closest to the interrupt frequency preset value.
Optionally, the states of the task include: an in-service state and an interrupt state.
Optionally, the interrupt frequency is denoted as F, and the count value is denoted as Fe; the CPU utilization rate in the period T is Fe/F multiplied by 100%.
In a second aspect, an embodiment of the present invention provides an apparatus for counting CPU utilization, including:
the interrupt module is used for interrupting the operating system according to the interrupt frequency of the interrupt timer after the interrupt timer is started;
the counting module is used for acquiring the state of each task in the operating system at the interruption moment, and counting the state of each task at each interruption moment to obtain a count value;
and the calculating module is used for calculating the CPU utilization rate of each task according to the interrupt frequency and the counting value of each task after the interrupt timer is closed.
Optionally, the first processing module is configured to set an interrupt frequency.
Optionally, the first processing module includes: and the first processing submodule is used for floating the interrupt frequency upwards or downwards to a preset value in a T period to obtain a prime number closest to the preset value of the interrupt frequency.
In a third aspect, an electronic device is provided, which includes: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method of statistical CPU utilization as described in the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium has stored thereon a computer program, which when executed by a processor, implements the steps of the method for calculating CPU utilization according to the first aspect.
In the embodiment of the invention, the operating system is suspended by adopting a timed interrupt mode, and the running condition of the operating system is observed in the interrupt process, so that the utilization rate of the CPU is counted, no additional hardware is required to be added, and the source code of the operating system is not required to be modified, so that the counting process does not influence the running of the system, and meanwhile, the accuracy of counting the utilization rate of the CPU is improved by adopting a mode of dynamically adjusting the interrupt frequency.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a method for calculating a CPU utilization according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an apparatus for calculating CPU utilization according to an embodiment of the present invention;
fig. 3 is an architecture diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for counting a CPU utilization, including:
step 11: after the interrupt timer is started, interrupting the operating system according to the interrupt frequency of the interrupt timer;
step 12: acquiring the state of each task in the operating system at the interruption time, and counting the state of each task at each interruption time to obtain a count value;
step 13: and after the interrupt timer is closed, calculating the CPU utilization rate of each task according to the interrupt frequency and the count value of each task.
In the embodiment of the invention, the CPU utilization rate is counted in a period T, the period T is artificially set according to specific application and business requirements, in the step 11, the interrupt frequency is preset, the higher the interrupt frequency of the timer is set, the smaller the observation gap is, the more accurate the counted CPU utilization rate is, the more the counted CPU utilization rate is, but the too high interrupt frequency can cause a great amount of CPU time consumption in the process of processing the timed interrupt, so that the deviation of the counted result is caused; because the resolution of the CPU utilization rate is one percent, and the precision requirement is not high, the interrupt frequency selected and set in the embodiment of the invention is 1000HZ, the observation precision provided by the interrupt frequency is enough, and the burden on the system can be ignored; in step 12, the state of each task in the operating system at the time of interruption is obtained through an API function provided by the operating system.
In the embodiment of the invention, the operating system is suspended by adopting a timed interrupt mode, and the running condition of the operating system is observed in the interrupt process, so that the utilization rate of a CPU is counted, additional hardware is not required to be added, and the source code of the operating system is not required to be modified, so that the counting process does not influence the running of the system.
In this embodiment of the present invention, optionally, before starting the interrupt timer, the method further includes: the interrupt frequency is set.
In this embodiment of the present invention, optionally, the setting the interrupt frequency includes: and in a T period, floating the interrupt frequency up or down to a preset value to obtain a prime number closest to the preset value of the interrupt frequency.
In the embodiment of the present invention, in order to solve the problem that the timer frequency and the periodic task operating frequency are easily in a multiple relationship due to a large number of periodic tasks in the operating system, a solution for dynamically adjusting the interrupt frequency is provided, and the interrupt frequency is floated up and down to an adjacent prime number, for example: the preset value of the interrupt frequency is 1000HZ, the interrupt frequency can float upwards to 1001HZ or float downwards to 997HZ in one period, and the number of times of upward floating and the number of times of downward floating of the interrupt frequency are basically consistent, so that the operating frequency of periodic tasks is avoided, and the reliability of CPU utilization rate statistics is improved.
In this embodiment of the present invention, optionally, the state of the task includes: an in-service state and an interrupt state.
In the embodiment of the present invention, optionally, the interrupt frequency is denoted as F, and the count value is denoted as Fe; the CPU utilization rate in the period T is Fe/F multiplied by 100%.
In the embodiment of the invention, the operating system is suspended by adopting a timed interrupt mode, and the running condition of the operating system is observed in the interrupt process, so that the utilization rate of the CPU is counted, no additional hardware is required to be added, and the source code of the operating system is not required to be modified, so that the counting process does not influence the running of the system, and meanwhile, the accuracy of counting the utilization rate of the CPU is improved by adopting a mode of dynamically adjusting the interrupt frequency.
Referring to fig. 2, an embodiment of the present invention provides a device for counting CPU utilization, including:
an interrupt module 21, configured to interrupt the operating system according to an interrupt frequency of the interrupt timer after the interrupt timer is started;
the counting module 22 is configured to obtain the state of each task in the operating system at the interrupt time, and count the state of each task at each interrupt time to obtain a count value;
and the calculating module 23 is configured to calculate the CPU utilization of each task according to the interrupt frequency and the count value of each task after the interrupt timer is turned off.
In the embodiment of the invention, the CPU utilization rate is counted in a period T, the period T is manually set according to specific application and service requirements, in an interrupt module 21, the interrupt frequency is preset, the higher the interrupt frequency of a timer is set, the smaller the observation gap is, the more accurate the counted CPU utilization rate is, the more real the counted CPU utilization rate is, but the too high interrupt frequency can cause a great amount of CPU time consumption in the process of processing timed interrupt, so that the deviation of the counted result occurs; because the resolution of the CPU utilization rate is one percent, and the precision requirement is not high, the interrupt frequency selected and set in the embodiment of the invention is 1000HZ, the observation precision provided by the interrupt frequency is enough, and the burden on the system can be ignored; in the counting module 22, the state of each task in the operating system at the time of interruption is obtained through an API function provided by the operating system.
In the embodiment of the invention, the operating system is suspended by adopting a timed interrupt mode, and the running condition of the operating system is observed in the interrupt process, so that the utilization rate of a CPU is counted, additional hardware is not required to be added, and the source code of the operating system is not required to be modified, so that the counting process does not influence the running of the system.
In the embodiment of the present invention, optionally, the first processing module is configured to set an interrupt frequency.
In this embodiment of the present invention, optionally, the first processing module includes: and the first processing submodule is used for floating the interrupt frequency to a preset value upwards or downwards in a T period to obtain a prime number closest to the preset value of the interrupt frequency.
In the embodiment of the present invention, in order to solve the problem that the timer frequency and the periodic task operating frequency are likely to have a multiple relationship due to a large number of periodic tasks in the operating system, a solution for dynamically adjusting the interrupt frequency is provided, and the interrupt frequency is floated up and down to an adjacent prime number, for example: the preset value of the interrupt frequency is 1000HZ, the interrupt frequency can float upwards to 1001HZ or float downwards to 997HZ in one period, and the number of times of upward floating and the number of times of downward floating of the interrupt frequency are basically consistent, so that the operating frequency of periodic tasks is avoided, and the reliability of CPU utilization rate statistics is improved.
In the embodiment of the invention, the operating system is suspended by adopting a timed interrupt mode, and the running condition of the operating system is observed in the interrupt process, so that the utilization rate of the CPU is counted, no additional hardware is required to be added, and the source code of the operating system is not required to be modified, so that the counting process does not influence the running of the system, and meanwhile, the accuracy of counting the utilization rate of the CPU is improved by adopting a mode of dynamically adjusting the interrupt frequency.
Referring to fig. 3, an embodiment of the present invention further provides an electronic device 30, which includes a processor 31, a memory 32, and a computer program stored in the memory 32 and capable of running on the processor 31, where the computer program, when executed by the processor 31, implements the processes of the method for calculating a CPU utilization ratio in the embodiment, and can achieve the same technical effects, and therefore, the descriptions are omitted here to avoid repetition.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above method for calculating a CPU utilization rate, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or an electronic device) to execute the methods according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for counting CPU utilization, comprising:
after the interrupt timer is started, interrupting the operating system according to the interrupt frequency of the interrupt timer;
acquiring the state of each task in the operating system at the interruption time, and counting the state of each task at each interruption time to obtain a count value;
and after the interrupt timer is closed, calculating the CPU utilization rate of each task according to the interrupt frequency and the count value of each task.
2. The method of claim 1, wherein starting the interrupt timer further comprises:
the interrupt frequency is set.
3. The method of claim 2, wherein setting the interrupt frequency comprises:
and in a T period, floating the interrupt frequency up or down to a preset value to obtain a prime number closest to the interrupt frequency preset value.
4. The method of claim 1, wherein the CPU utilization is measured,
the states of the tasks include: an in-service state and an interrupt state.
5. The method of claim 3, wherein the CPU utilization is measured,
the interruption frequency is recorded as F, and the counting value is recorded as Fe;
the CPU utilization rate in the period T is Fe/F multiplied by 100%.
6. An apparatus for counting CPU utilization, comprising:
the interrupt module is used for interrupting the operating system according to the interrupt frequency of the interrupt timer after the interrupt timer is started;
the counting module is used for acquiring the state of each task in the operating system at the interruption moment, and counting the state of each task at each interruption moment to obtain a count value;
and the calculating module is used for calculating the CPU utilization rate of each task according to the interrupt frequency and the counting value of each task after the interrupt timer is closed.
7. The apparatus for statistics of CPU utilization according to claim 6, further comprising:
the first processing module is used for setting the interrupt frequency.
8. The apparatus according to claim 7, wherein the first processing module comprises:
and the first processing submodule is used for floating the interrupt frequency to a preset value upwards or downwards in a T period to obtain a prime number closest to the preset value of the interrupt frequency.
9. An electronic device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of statistical CPU utilization according to any one of claims 1 to 8.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of statistical CPU utilization according to any one of claims 1 to 8.
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| CN202011295305.1A CN114518991A (en) | 2020-11-18 | 2020-11-18 | Method and device for counting CPU utilization rate |
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| CN202011295305.1A CN114518991A (en) | 2020-11-18 | 2020-11-18 | Method and device for counting CPU utilization rate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344865A (en) * | 2008-08-15 | 2009-01-14 | 中兴通讯股份有限公司 | CPU occupancy rate measuring method and apparatus |
| CN107832157A (en) * | 2017-12-13 | 2018-03-23 | 深圳天珑无线科技有限公司 | Dynamic power supply management method, mobile terminal and storage medium |
| CN108681498A (en) * | 2018-03-23 | 2018-10-19 | 维沃移动通信有限公司 | A kind of monitoring method of CPU usage, device and mobile terminal |
| CN110990229A (en) * | 2019-12-17 | 2020-04-10 | 北京天融信网络安全技术有限公司 | System information acquisition method and device |
| CN111552614A (en) * | 2020-04-28 | 2020-08-18 | 杭州迪普科技股份有限公司 | Statistical method and device for CPU utilization rate |
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2020
- 2020-11-18 CN CN202011295305.1A patent/CN114518991A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344865A (en) * | 2008-08-15 | 2009-01-14 | 中兴通讯股份有限公司 | CPU occupancy rate measuring method and apparatus |
| CN107832157A (en) * | 2017-12-13 | 2018-03-23 | 深圳天珑无线科技有限公司 | Dynamic power supply management method, mobile terminal and storage medium |
| CN108681498A (en) * | 2018-03-23 | 2018-10-19 | 维沃移动通信有限公司 | A kind of monitoring method of CPU usage, device and mobile terminal |
| CN110990229A (en) * | 2019-12-17 | 2020-04-10 | 北京天融信网络安全技术有限公司 | System information acquisition method and device |
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