CN1359041A - Method for adjusting CPU frequency according to CPU availability - Google Patents
Method for adjusting CPU frequency according to CPU availability Download PDFInfo
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- CN1359041A CN1359041A CN 00128243 CN00128243A CN1359041A CN 1359041 A CN1359041 A CN 1359041A CN 00128243 CN00128243 CN 00128243 CN 00128243 A CN00128243 A CN 00128243A CN 1359041 A CN1359041 A CN 1359041A
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Abstract
The method for regualting CPU frequency according to the utilization rate of CPU is characterized by that setting comparison domain valve of CPU utilization rate, continuously detecting CPU utilization rate of obtain actual measurment value of CPU utilization rate, comparing measurement value with set domain value and regulating CPU frequency according to the compared result. The concrete regulation steps of CPU frequency are: regulating effective working time of CPU Tw, setting pulse regulating period T, superposing pulse regulating period T and reference clock fixed by CPU, uniformly regulating Tw and T so as to obtain the average operation speed of CPU. Said invention is aimed at saving energy ensuring CPU safety and prolonging service life of CPU.
Description
The present invention relates to a kind of control method of cpu frequency, especially a kind of current utilization factor according to CPU is adjusted cpu frequency, in the hope of reaching energy-conservation, reducing thermal value, ensures CPU safety, prolongs the method for CPU purpose in serviceable life.
Along with the develop rapidly of current microelectric technique, the row of PC can be more and more higher, and especially as the CPU of computing machine " heart " or " brain ", its speed promotes significantly, and therefore the user has obtained splendid performance.But because the dominant frequency of CPU constantly promotes, the power consumption of CPU also increases significantly.The heat dissipation problem that reaches 1GHz CPU when above when CPU frequency is very serious just.CPU moves for a long time, the fundamental element of its CPU---silicon semiconductor itself can produce a large amount of heats, causes cpu temperature higher, because cpu temperature is too high CPU is burnt sometimes, the integral body that causes computing machine of burning of CPU is paralysed, and the loss that brings is often very heavy.The heating of CPU is again system's thermal value management highest priority.Therefore the cooling of CPU is consistent is the problem that industry is made great efforts exploration.Sometimes for guaranteeing cooling, have to bigger heat abstractor is set, so that the complicated cooling system of configuration to CPU.Simultaneously, the power consumption of computing machine, energy-conservation also be unusual important problem.When for example using notebook computer, usually can be because of the finite energy of battery can't the long period use, therefore energy-conservation meaning is very important at this.When CPU ran up, also full load runnings such as its fan were so noise is bigger simultaneously.
In the use of reality, do the CPU travelling speed difference that needs for different application programs.For example, general documents editing program CPU speed is hanged down and can be satisfied; Handle but carry out pictorial data, or when carrying out big data quantity exchange such as network browsing and transmitting, CPU has to operate at higher speed, could satisfy program feature when using a computer.CPU is under different travelling speed, and the difference of the noise of its power consumption, heating and accessory is bigger.So should be able to regulate the running frequency of CPU according to the application demand of reality, so that optimize the duty of CPU.
The objective of the invention is to provide a kind of method of regulating cpu frequency according to the utilization factor of CPU at the deficiency of prior art, it is when the CPU operate as normal, by detecting the utilization factor of CPU, under the prerequisite that does not influence application program capacity, by reducing cpu frequency, realize lowest power consumption and minimum noise
The object of the present invention is achieved like this:
A kind of method of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: it comprises the steps:
1, sets relatively thresholding of cpu busy percentage;
2, constantly detect cpu busy percentage, obtain the measured value of cpu busy percentage reality;
3, the thresholding that compares and measures value and set;
4,, regulate cpu frequency according to comparative result.
Described thresholding comprises sets current measured value and average calculated value; Corresponding C PU utilization factor measured value comprises current measured value and average calculated value; The thresholding step that compares and measures value and set comprises and compares and measures value and average calculated value.
Described average computation value is the sliding average of cpu busy percentage in a period of time; Before the described thresholding step that compares and measures value and set, the sliding average that should carry out cpu busy percentage calculates.
Described average computation is worth and is divided into different time sections more than a section pairing computing time, and the corresponding different time period is set the thresholding of different average computation values.
Described different time sections can be short period and long period.
The described short period can be 1 second; Long period can be 1 minute.
The sliding average of different time sections is provided with upper and lower bound in the thresholding of described average computation value.
The upper limit of the sliding average of described short period section can be further divided into first upper limit and second upper limit.
Described field value set step satisfies following condition: T
Ml＜T
Sl＜T
Mh＜T
Sh1＜T
Sh2＜T
ChJust begin to detect and calculate cpu busy percentage;
Wherein: T
SlIt is the lower limit of the sliding average in 1 second;
T
Sh1, T
Sh2, be respectively the different upper limit of sliding average in 1 second;
T
Ml, T
MhBe the lower limit and the upper limit of the sliding average in 1 minute;
T
Ch, be respectively the upper limit of current measured value.
The sliding average of described cpu busy percentage calculates should corresponding each different time sections and set sliding average in the thresholding up and down and carry out.
The detection of the current utilization factor of described CPU is to detect once in per 0.1 second.
Described cpu frequency is regulated gradable.
Described cpu frequency is regulated and can be regulated step by step according to the grade of being divided.
Described adjusting cpu frequency step is:
If U
s＜T
SlAnd V＞50% cpu frequency is to downward modulation;
If U
s＞T
Sh1And U
m＞T
MhCpu frequency is to rise;
Wherein: U
sBe the CPU sliding average in 1 second;
U
mBe 1 minute sliding average of CPU;
V is the cpu frequency maximal value, just the setting value of cpu frequency.
Described adjusting cpu frequency step also comprises: if U
s＜T
SlAnd U
m＜T
MlAnd V＜=50%CPU frequency is to downward modulation.
Described adjusting cpu frequency step also comprises: if U
s＞T
Sh2And U
c＞T
ChCpu frequency directly is adjusted to 100%; U wherein
cBe the current utilization factor of CPU.
The concrete regulating step of described cpu frequency is:
1, adjusts CPU operational use time Tw, set and adjust recurrence interval T;
2, it is superimposed to adjust the fixing reference clock of recurrence interval T and CPU;
3, even regulation is adjusted Tw and the T in the pulse;
4, obtain the CPU average running speed, just the cpu frequency regulated value.
Described method can be organized in the core resident background program under the operating system, comes it is controlled, so that the CPU that starts shooting can revert to normal value at every turn.
According to method of the present invention, under different actual operating frequencies, CPU can stably move, and therefore can greatly reduce the thermal value of CPU, has saved the required power consumption of CPU greatly, reduces the noise of cpu fan.
For common applied environment, as documents editing or network browsing, the frequency of CPU can be fluctuated.But mean value is just enough at 300MHz.And the overall heat radiation of CPU is still preferable, and therefore of short duration high frequency can not cause very big influence to it.So used method of the present invention, adopt cpu fan to regulate again, its radiating effect is more obvious.
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiments.
Fig. 1 is that cpu frequency of the present invention is regulated process flow diagram;
Fig. 2 is a cpu busy percentage curve map;
Fig. 3 is that cpu frequency of the present invention is regulated the waveform synoptic diagram.
Dominant ideas of the present invention are under the prerequisite that does not influence application program capacity, by reducing the frequency of CPU, realize minimum power consumption and minimum noise.Basic mechanism is to set the basic standard thresholding, reads cpu busy percentage one time in per 0.1 second, calculates 1 second sliding average and 1 minute sliding average of cpu busy percentage.Be standard with these three values then, regulate the actual frequency of CPU according to certain controlling schemes.
The present invention is a kind of method of regulating cpu frequency according to the utilization factor of CPU, and its core procedure is:
1, sets relatively thresholding of cpu busy percentage;
2, constantly detect cpu busy percentage, obtain the measured value of cpu busy percentage reality;
3, the thresholding that compares and measures value and set;
4,, regulate cpu frequency according to comparative result.
Concrete steps are in conjunction with Fig. 1, for:
1, thresholding standard, called after T are compared in definition
Sl, T
Ml, T
Ch, T
Sh1, T
Sh2, T
Ch, they satisfy following condition: T
Ml＜T
Sl＜T
Mh＜T
Sh1＜T
Sh2＜T
Ch
2, set initial cpu busy percentage Buffer.
3, detected current C PU utilization factor, called after U in per 0.1 second
c
4, calculate 1 second sliding average and 1 minute sliding average of cpu busy percentage, be defined as U respectively
sAnd U
m
5, setting value/the cpu frequency maximal value is the setting rate of CPU to the name cpu frequency, is defined as V.
6, control according to following scheme:
If U
s＜T
SlAnd V＞50% cpu frequency downward modulation one-level.
If U
s＜T
SlAnd U
m＜T
MlAnd V＜=50% cpu frequency downward modulation one-level.
If U
s＞T
Sh1And U
m＞T
MhCpu frequency raises one-level.
If U
s＞T
Sh2And and U
c＞T
ChCpu frequency is set at 100%.
Wherein: T
SlIt is the lower limit of the sliding average in 1 second;
T
Sh1, T
Sh2, be respectively the different upper limit of sliding average in 1 second;
T
Ml, T
MhBe the lower limit and the upper limit of the sliding average in 1 minute;
T
Ch, be respectively the upper limit of current measured value.
Change if cpu frequency is set, then reset initial cpu busy percentage buffering (Buffer), to calculate 1 second sliding average and 1 minute sliding average of cpu busy percentage week.Its concrete setting value is different with controlling schemes.
Can analyze top controlling schemes like this: at first definition, the optimum value of 1 second sliding average of cpu busy percentage is at T
SlTo T
Sh1Between, the sliding average optimum value was at T in 1 minute
MlTo T
MhBetween.The utilization factor that is to say CPU is in not high low state, promptly half-full state, and be the effective status of CPU this moment.This state can very well move all application programs of current system, and does not influence performance.And inferior kind of state has certain allowance again, in case the increase of burst takes place the load of system, CPU has certain ability to bear these tasks again.If cpu busy percentage is too high, then can think to be unfavorable for the overload of power of CPU coping with contingencies.Cross when low when cpu busy percentage, can think that most of CPU in the free time, wastes energy in a large number, and not increase the performance of Any Application.
From cpu busy percentage curve as shown in Figure 2, the utilization factor that can see CPU is what beat, is not a more stable curve, exists the characteristics of short-term burst, long-time stability again.So the cpu busy percentage in the handy a certain moment is not regulated the frequency setting value of CPU, so adopted three data here as a reference: current cpu busy percentage U
c, 1 second sliding average U of cpu busy percentage
sWith 1 minute sliding average U
mU wherein
cBe the measured value in 0.1 second the moment, U
sBe nearest 10 times U
cMean value, U
mBe nearest 60 times U
sMean value.By calculating U
sAnd U
m, can roughly obtain the utilization factor situation of more stable CPU.Also just obtained regulating the foundation of cpu frequency.
Because the sudden factor of cpu busy percentage is so use U
sIt is rational being used as main evaluating.Owing to when cpu frequency setting rate is very low, not enough again to paroxysmal response meeting, so use U
mEstimate the frequency setting rate smaller or equal to the frequency setting rate that whether continued to reduce CPU at 50% o'clock.Work as U
m＜T
MlThe time, can think that system stably moves the program of low load in a period of time.At this moment, consider, the frequency of CPU can be reduced one-level again from energy-conservation angle.
For after the frequency values that reduces CPU, can not influence user's sudden work, as new program of unexpected startup, so timing has added U on CPU
cReference.If U
c＞T
ChAnd U
s＞T
Sh2, this is not the peak value of moment to satisfy these two condition stubs, but truly has the load of burst to increase, thus be 100% with the frequency setting of CPU at once, to satisfy the performance that can not influence application program to the requirement of CPU that happens suddenly.Work as U
s＞T
Sh1And U
m＞T
mThe time, illustrate that cpu busy percentage is on average higher this moment, thus frequency setting value is raised one-level, to alleviate the pressure of CPU.
The controlling schemes of this cpu frequency of stating above can be finished the reasonable control to the CPU energy preferably, on implementation method, being actually core resident background program under Windows of establishment comes it is controlled, like this, after whenever resetting computing machine, cpu frequency will be replied and will be virgin state, not have any state of leaving over.
Referring to Fig. 3, the concrete regulating step of cpu frequency is:
1, adjusts CPU operational use time Tw, set and adjust recurrence interval T;
2, it is superimposed to adjust the fixing reference clock of recurrence interval T and CPU;
3, even regulation is adjusted Tw and the T in the pulse;
4, obtain the CPU average running speed, just the cpu frequency regulated value.
By certain experiment, draw following result:
Experiment condition: PIII 1000, one section wav file of operation Media player repeat playing.Each application program is: regulate cpu frequency software: throttle.exe test CPU speed software: myben
Ch.exeCPU utilization factor monitoring: System Monitor
| The cpu frequency regulated value | CPU velocity test value | Cpu busy percentage (minimum-the highest) |
| ????100％ | ????875 | ????14％-25％ |
| ????75％ | ????649 | ????18％-38％ |
| ????50％ | ????465 | ????27％-45％ |
| ????25％ | ????281 | ????57％-78％ |
| ????12.5％ | ????190 | ????65％-100％ |
Below as can be seen, reduction along with cpu frequency, when the same application program of operation, cpu busy percentage progressively increases, when above, the effect of application program will reduce, and that is to say to 80%, can not satisfy the requirement of application program to such an extent as to the speed of CPU is too low, this moment need be with the frequency of CPU to adjusted.One group of comparatively reasonably threshold value is set, but the running status of CPU obtains comparatively ideal optimization.
By certain test, proving can stable operation and can not crash according to the program of this control strategy establishment, and can not influence user's usability, again can be energy-conservation significantly, greatly reduce the thermal value of CPU.For common applied environment, as documents editing, the frequency of CPU can be fluctuated, but mean value is also just just enough at 300MHz.And the CPU heat radiation is a general effect, and of short duration high primary frequency can not cause great influence to it.So in such applied environment, used cpu frequency control after, adopt the temperature control effect of cpu fan rotating speed can highly significant again, can reach extremely low noise.These sharpest edges also of the present invention just.
Claims (18)
1, a kind of method of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: it comprises the steps:
A, setting cpu busy percentage be thresholding relatively;
B, constantly detect cpu busy percentage, obtain the measured value of cpu busy percentage reality;
C, the thresholding that compares and measures value and set;
D, according to comparative result, regulate cpu frequency.
2, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 1 is characterized in that: described thresholding comprises sets current measured value and average calculated value; Corresponding C PU utilization factor measured value comprises current measured value and average calculated value; The thresholding step that compares and measures value and set comprises and compares and measures value and average calculated value.
3, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 2 is characterized in that: described average computation value is the sliding average of cpu busy percentage in a period of time; Before the described thresholding step that compares and measures value and set, the sliding average that should carry out cpu busy percentage calculates.
4, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 3, it is characterized in that: described average computation is worth and is divided into different time sections more than a section pairing computing time, and the corresponding different time period is set the thresholding of different average computation values.
5, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 4, it is characterized in that: described different time sections can be short period and long period.
6, method of regulating cpu frequency as claimed in claim 5 according to the utilization factor of CPU, it is characterized in that: the described short period can be 1 second; Long period can be 1 minute.
7, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 4, it is characterized in that: the sliding average of different time sections is provided with upper and lower bound in the thresholding of described average computation value.
8, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 7, it is characterized in that: the upper limit of the sliding average of described short period section can be further divided into first upper limit and second upper limit.
9, as claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 described methods of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: described field value set step satisfies following condition: T
Ml＜T
Sl＜T
Mh＜T
Sh1＜T
Sh2＜T
ChJust begin to detect and calculate cpu busy percentage;
Wherein: T
SlIt is the lower limit of the sliding average in 1 second;
T
Sh1, T
Sh2, be respectively the different upper limit of sliding average in 1 second;
T
Ml, T
MhBe the lower limit and the upper limit of the sliding average in 1 minute;
T
Ch, be respectively the upper limit of current measured value.
10, the utilization factor according to the CPU as claimed in claim 4 method of regulating cpu frequency is characterized in that: the sliding average of described cpu busy percentage calculates should corresponding each different time sections and set sliding average in the thresholding up and down and carry out.
11, the utilization factor according to the CPU as claimed in claim 1 method of regulating cpu frequency is characterized in that: the detection of the current utilization factor of described CPU is to detect once in per 0.1 second.
12, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 1, it is characterized in that: described cpu frequency is regulated gradable.
13, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 12, it is characterized in that: described cpu frequency is regulated and can be regulated step by step according to the grade of being divided.
14, as claim 1 or 10 or 12 described methods of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: described adjusting cpu frequency step is:
If U
s＜T
SlAnd V＞50% cpu frequency is to downward modulation;
If U
s＞T
Sh1And U
m＞T
MhCpu frequency is to rise;
Wherein: U
sBe the CPU sliding average in 1 second;
U
mBe 1 minute sliding average of CPU;
V is the cpu frequency maximal value, just the setting value of cpu frequency.
15, as claim 1 or 10 or 12 described methods of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: described adjusting cpu frequency step also comprises: if U
s＜T
SlAnd U
m＜T
MlAnd V＜=50% cpu frequency is to downward modulation.
16, as claim 1 or 10 or 12 described methods of regulating cpu frequency according to the utilization factor of CPU, it is characterized in that: described adjusting cpu frequency step also comprises: if U
s＞T
Sh2And U
c＞T
ChCpu frequency directly is adjusted to 100%; U wherein
cBe the current utilization factor of CPU.
17, method of regulating cpu frequency as claimed in claim 1 according to the utilization factor of CPU, it is characterized in that: the concrete regulating step of described cpu frequency is:
A, adjustment CPU operational use time Tw set and adjust recurrence interval T;
B, will to adjust the fixing reference clock of recurrence interval T and CPU superimposed;
C, even regulation are adjusted Tw and T in the pulse;
D, obtain the CPU average running speed, just the cpu frequency regulated value.
18, method of regulating cpu frequency according to the utilization factor of CPU as claimed in claim 1, it is characterized in that: described method can be organized in the core resident background program under the operating system, the CPU that starts shooting comes it is controlled, so that can revert to normal value at every turn.
Priority Applications (1)
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|---|---|---|---|
| CNB001282433A CN1151416C (en) | 2000-12-18 | 2000-12-18 | Method for adjusting CPU frequency according to CPU availability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001282433A CN1151416C (en) | 2000-12-18 | 2000-12-18 | Method for adjusting CPU frequency according to CPU availability |
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|---|---|
| CN1359041A true CN1359041A (en) | 2002-07-17 |
| CN1151416C CN1151416C (en) | 2004-05-26 |
Family
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| CN112912820A (en) * | 2018-10-26 | 2021-06-04 | 华为技术有限公司 | Energy efficiency adjustment for CPU regulators |
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