CN106951306A - A kind of STW detection methods, device and equipment - Google Patents
A kind of STW detection methods, device and equipment Download PDFInfo
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- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
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- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
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Abstract
This application discloses a kind of STW detection methods, device and equipment, method includes：The initial address difference for obtaining the first object between pointer address when the second object is each created, wherein, first object and second object are respectively the strongly reference object being pre-created, and at least one the 3rd object has also been pre-created between first object and the respective pointer address of the second object, the 3rd object is weak reference object；Obtain first object and the respective current pointer address of second object；Based on first object and the respective current pointer address of second object, the current address difference between first object and second object is obtained；The initial address difference is compared with the current address difference, comparison result is obtained；When the comparison result meets default address distance change condition, the testing result that STW is likely to occur in the JVM is generated.
Description
Technical field
The application is related to virtual machine technique field, more particularly to a kind of STW detection methods, device and equipment.
Background technology
Java is compared to an advantage of other Languages：It need not show and be managed when carrying out Object Management group to java
Object content, but Memory Allocation and the recovery of object are automatically carried out by Java Virtual Machine (JVM).Internal memory in Java
Reclaiming principle is：If object is not cited, the internal memory of the object can be recovered.
In Memory recycle, JVM carries out Memory recycle under different scenes using different ways of recycling.It is for example conventional to return
Memory headroom to be recycled is only discharged in debit's formula, and when memory fragmentation is more, by the way of compacting is reclaimed, i.e., first
Release memory headroom to be recycled, in addition it is also necessary to rearranged remaining data or object in internal memory, to eliminate internal memory
Fragment.
And when JVW carries out compacting recovery, it may occur that stop the world are STW phenomenon.If JVW is entering
There is STW during reclaiming in row compacting, then JVM can hang up all user threads, now the user program quilt in JVM
Stop completely, can just recover response after STW terminates.Therefore, when STW occurs, JVW user program cannot respond to outside
Boundary is asked, and causes the cluster belonging to JVM or application not to run normally, accordingly, it would be desirable to the appearance to STW is detected in time,
To notify to the external world correspondingly to be operated, it is to avoid occur the situation that the application comprising JVW or cluster can not normally be run.
The content of the invention
In view of this, the purpose of the application is to provide a kind of STW detection methods, device and equipment, existing to solve
STW technical problem can not be detected in technology in time.
This application provides a kind of STW detection methods, including：
The initial address difference for obtaining the first object between pointer address when the second object is each created, wherein,
First object and second object are respectively the strongly reference object being pre-created, and first object and described second
At least one the 3rd object is also pre-created between the respective pointer address of object, the 3rd object is weak reference object；
Obtain first object and the respective current pointer address of second object；
Based on first object and the respective current pointer address of second object, first object and institute are obtained
State the current address difference between the second object；
The initial address difference is compared with the current address difference, comparison result is obtained；
When the comparison result meets default address distance change condition, generate in the JVM and be likely to occur STW's
Testing result.
The above method, it is preferred that the address distance change condition is：Between first object and second object
Address distance change；
The comparison result meets default address distance change condition, including：
The comparison result shows that first object and the initial address difference of second object and current address are poor
Value compares inconsistent.
The above method, it is preferred that acquisition first object and the respective current pointer address of second object,
Including：
Using JNI methods, first object and the respective current pointer address of second object are obtained.
The above method, it is preferred that described to be based on first object and the respective current pointer address of second object,
The current address difference between first object and second object is obtained, including：
The value of the current pointer address of second object is subtracted to the amount of the current pointer address of first object
Value, obtains value subtraction result；
The absolute value of the value subtraction result is taken as the current position between first object and second object
Location difference.
This application provides a kind of STW detection means, including：
Between initial difference acquiring unit, pointer address when being each created for the first object of acquisition and the second object
Initial address difference, wherein, first object and second object are respectively the strongly reference object being pre-created, and institute
State and at least one the 3rd object has also been pre-created between the first object and the respective pointer address of the second object, described
Three objects are weak reference object；
Address acquisition unit, for obtaining first object and the respective current pointer address of second object；
Current difference acquiring unit, for based on first object and the respective current pointer of the second object
Location, obtains the current address difference between first object and second object；
Difference comparing unit, for the initial address difference to be compared with the current address difference, is compared
To result；
As a result generation unit, described for when the comparison result meets default address distance change condition, generating
STW testing result is likely to occur in JVM.
Said apparatus, it is preferred that the address distance change condition is：Between first object and second object
Address distance change；
The result generation unit specifically for：Comparison result show first object and second object just
When beginning difference in address compares inconsistent with current address difference, the testing result that STW is likely to occur in the JVM is generated.
Said apparatus, it is preferred that the address acquisition unit specifically for：Using JNI methods, first object is obtained
And the respective current pointer address of the second object.
Said apparatus, it is preferred that the current difference acquiring unit includes：
Magnitude calculation subelement, for the value of the current pointer address of second object to be subtracted into first object
Current pointer address value, obtain value subtraction result；
Take absolute value subelement, for taking the absolute value of the value subtraction result as first object and described the
Current address difference between two objects.
Present invention also provides a kind of STW detection devices, including：
Memory, for storing application program and the produced data of application program operation；
Processor, for performing the application program, to realize following functions：The first object is obtained with the second object each
Initial address difference between pointer address when being created, wherein, first object is respectively pre- with second object
Also it has been pre-created between the strongly reference object first created, and first object and the respective pointer address of the second object
At least one the 3rd object, the 3rd object is weak reference object；Obtain first object and second object each
Current pointer address；Based on first object and the respective current pointer address of second object, described first is obtained
Current address difference between object and second object；The initial address difference and the current address difference are carried out
Compare, obtain comparison result；When the comparison result meets default address distance change condition, generating can in the JVM
STW testing result can occur.
A kind of STW detection methods, device and the equipment provided from such scheme, the application, by pre-setting two
Individual strongly reference object, and monitor the address difference of two strongly reference objects after setting weak reference object between strongly reference object
Whether value meets address distance change condition (for example, whether the address distance between two strongly reference objects of monitoring changes
Deng), and then judge to reclaim either with or without the compacting for carrying out internal memory in JVM, the thus address difference between two strongly reference objects
The testing result that STW is likely to occur in JVM is generated when value changes, the real-time inspection to whether being likely to occur STW in JVM is realized
Survey.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 realizes flow chart for a kind of STW detection methods of the offer of the embodiment of the present application one；
Fig. 2 is the application exemplary plot of the embodiment of the present application；
Fig. 3 is a kind of structural representation for STW detection means that the embodiment of the present application two is provided；
Fig. 4 is the part-structure schematic diagram of the embodiment of the present application two；
Fig. 5 is a kind of structural representation for STW detection devices that the embodiment of the present application three is provided.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
With reference to Fig. 1, it is that a kind of STW detection methods that the embodiment of the present application one is provided realize flow chart, applies in JVM
In, to be detected in time to whether occurring STW in JVM, specifically, in the present embodiment, this method can include following
Step：
Step 101：Obtain the first object and the respective current pointer address of the second object.
Wherein, the first object and the second object are respectively the strongly reference object that the present embodiment is pre-created, this strongly reference
Object will not be recovered when the compacting of internal memory is reclaimed, and the first object is created in the first pointer address, and the second object is created
In the second pointer address, as shown in Figure 2.
And it has been pre-created at least one the 3rd object between the first object and the respective pointer address of the second object,
3rd object is weak reference object, and this weak reference object can be recovered when the compacting of internal memory is reclaimed.As shown in Figure 2,
Three objects are created between the first object and the second object, are：The 3rd pointer address that 3rd object is created is between
Between one pointer address and the second pointer address.
The 3rd object in the present embodiment can be 1, or multiple.And in order to increase the accuracy of detection, the
The quantity of three objects can be set to multiple in the allowed band of memory headroom, and such as 4 even more.
It should be noted that because the compacting that internal memory may be carried out in JVM is reclaimed, therefore, the first object and second pair
As respective pointer address there may be change, the first object and the respective current pointer address of the second object are different from two strong
Pointer address when reference object is created, therefore, the current pointer address of the first object may phases with its first pointer address
Together may also be different, the current pointer address of the second object is identical from its second pointer address possibility may also be different.
Wherein, the first object and the respective current pointer of the second object can be obtained in the present embodiment using JNI methods
Address.
Step 102：Based on the first object and the respective current pointer address of the second object, the first object and second pair are obtained
Current address difference as between.
Wherein, current address difference be current pointer address and the second object of the first object current pointer address it
Between address offset amount size.
Specifically, current address difference can be obtained in the present embodiment in the following manner：
The value of the current pointer address of second object is subtracted to the value of the current pointer address of the first object first, obtained
To value subtraction result；
Then the absolute value of taken amount value subtraction result is used as the current address between the first object and second object then,
Difference.
Step 103：The initial address for obtaining the first object between pointer address when the second object is each created is poor
Value.
As shown in Figure 2, initial address difference is：Address offset between first pointer address and the second pointer address
The size of amount.The initial address difference is different from above-mentioned current address difference, and initial address difference refers to first under original state
Offset size between the pointer address of the pointer address of object and the second object, and between the first object and the second object
Current address difference refers to the pointer address and the second object that the first object under current state after the regular hour is run in JVM
Pointer address between offset size.
Accordingly, the initial address difference between the first object and the second object is identical with current address difference possibility,
May be different.If the compacting that internal memory did not occur between the first object and the second object for JVM is reclaimed, then initial address
Difference is identical with current address difference；If the compacting that internal memory occurred between the first object and the second object for JVM is reclaimed, that
Initial address difference is different from current address difference.
It should be noted that the execution sequence of step 103 and the execution sequence of step 102 are unrestricted, for example, step
103 can perform before step 101 and step 102, or, step 103 can be performed after step 101 and step 102,
Or, step 103 synchronous with step 101 or sign 102 can be performed.
And it is preferred that, step 103 can perform after the first object and the second object are created, and then need to carry out
When STW is detected, then step 101 and step 102 and subsequent step are performed, realize the present embodiment.
Step 104：Initial address difference is compared with current address difference, comparison result is obtained, in comparison result
When meeting default address distance change condition, step 105 is performed.
Wherein, initial address difference is the sizes values of address offset amount with current address difference, therefore, in the present embodiment
Can directly by two differences, whether size is identical is compared, obtain comparison result.
And default address distance change condition can be：Whether the address distance between the first object and the second object is sent out
Changing, that is to say, that whether the comparison of initial address difference and current address difference between the first object and the second object
Unanimously.As whether the offset between the first pointer address and the second pointer address in Fig. 2 changes.
It should be noted that in comparison result, if initial address difference is compared unanimously with current address difference, that is,
Two differences are identical, then may indicate that the distance of the address between the first object and the second object does not change, then show the
There is no the compacting for occurring internal memory to reclaim between one object and the second object, then with regard to not carrying out or occurring STW；If initial
Difference in address compared with current address difference it is inconsistent, that is, two difference differences, then may indicate that the first object and second
Address distance between object changes, now, shows to carry out the pressure of internal memory between the first object and the second object certainly
It is real to reclaim, then may occur STW.
Step 105：STW testing result is likely to occur in generation JVM.
Wherein, the testing result for occurring STW in JVM is represented：STW may be carried out in JVM.
It should be noted that when detecting to be likely to occur STW, completing detection, then can delete two strongly reference objects
That is the first object and the second object, save memory headroom.
A kind of STW detection methods provided from such scheme, the embodiment of the present application one are strong by pre-setting two
Reference object, and between strongly reference object after setting weak reference object, the difference in address of two strongly reference objects of monitoring is
The no address distance change condition that meets is (for example, whether the address distance between the first object of monitoring and the second object changes
Deng), and then judge to reclaim either with or without the compacting for carrying out internal memory in JVM, the thus address difference between two strongly reference objects
STW testing result may be carried out by being generated when value changes in JVM, be realized to that whether may carry out STW reality in JVM
When detect.
It should be noted that in the present embodiment, after a STW detection is completed, can return and re-execute embodiment,
Carry out STW detections next time.For example, after step 105 monitors STW, returning and performing step 101, carry out STW's again
Detection.
It should be noted that the detection for carrying out STW again refers to monitor STW appearance in JVM again, then the present embodiment
In, the operation for being pre-created two strongly reference objects and at least one weak reference object is also required to re-execute, and Object Creation is complete
After, when needing to carry out STW detections, then the difference in address between two strongly reference objects is obtained, and whether judge difference
Change, and then detect whether STW is likely to occur.
It is a kind of structural representation for STW detection means that the embodiment of the present application two is provided with reference to Fig. 3, wherein, apply
In JVM, to be detected in time to whether occurring STW in JVM, specifically, in the present embodiment, the device can include with
Lower structure：
Address acquisition unit 301, for obtaining the first object and the respective current pointer address of the second object.
Wherein, the first object and the second object are respectively the strongly reference object that the present embodiment is pre-created, this strongly reference
Object will not be recovered when the compacting of internal memory is reclaimed, and the first object is created in the first pointer address, and the second object is created
In the second pointer address, as shown in Figure 2.
And it has been pre-created at least one the 3rd object between the first object and the respective pointer address of the second object,
3rd object is weak reference object, and this weak reference object can be recovered when the compacting of internal memory is reclaimed.As shown in Figure 2,
Three objects are created between the first object and the second object, are：The 3rd pointer address that 3rd object is created is between
Between one pointer address and the second pointer address.
The 3rd object in the present embodiment can be 1, or multiple.And in order to increase the accuracy of detection, the
The quantity of three objects can be set to multiple in the allowed band of memory headroom, and such as 4 even more.
It should be noted that because the compacting that internal memory may be carried out in JVM is reclaimed, therefore, the first object and second pair
As respective pointer address there may be change, the first object and the respective current pointer address of the second object are different from two strong
Pointer address when reference object is created, therefore, the current pointer address of the first object may phases with its first pointer address
Together may also be different, the current pointer address of the second object is identical from its second pointer address possibility may also be different.
Wherein, the first object and the respective current pointer of the second object can be obtained in the present embodiment using JNI methods
Address.
Current difference acquiring unit 302, for based on the first object and the respective current pointer address of the second object, obtaining
Current address difference between first object and the second object.
Wherein, current address difference be current pointer address and the second object of the first object current pointer address it
Between address offset amount size.
Specifically, current address difference can be obtained by following structure in the present embodiment, it is as shown in Figure 4, current poor
Value acquiring unit 302 can include following structure：
Magnitude calculation subelement 401, for the value of the current pointer address of the second object to be subtracted into working as the first object
The value of prior pointer address, obtains value subtraction result.
Take absolute value subelement 402, for taken amount value subtraction result absolute value as the first object and the second object it
Between current address difference.
Initial difference acquiring unit 303, pointer address when being each created for the first object of acquisition and the second object
Between initial address difference.
As shown in Figure 2, initial address difference is：Address offset between first pointer address and the second pointer address
The size of amount.The initial address difference is different from above-mentioned current address difference, with referring under original state the pointer of the first object
Offset size between the pointer address of location and the second object, and the current address difference between the first object and the second object
Refer to the pointer address of the first object and the second object under current state after JVM runs the regular hour pointer address it
Between offset size.
It should be noted that initial difference acquiring unit 303 and address acquisition unit 301 and current difference acquiring unit
302 operation order can be with unrestricted, such as：Initial difference acquiring unit 303 can be in address acquisition unit 301 and current
Run before difference acquiring unit 302, or, initial difference acquiring unit 303 can be in address acquisition unit 301 and current poor
It is worth operation after acquiring unit 302, or, initial difference acquiring unit 303 can be with address acquisition unit 301 or current difference
Acquiring unit 302 is run simultaneously.
And it is preferred that, initial difference acquiring unit 303 can be triggered fortune after the first object and the second object are created
OK, then when needing to carry out STW detections, address acquisition unit of reruning 301 and current difference acquiring unit 302 and other lists
Member, realizes the present embodiment.
Difference comparing unit 304, for initial address difference to be compared with current address difference, obtains comparing knot
Really.
Wherein, initial address difference is the sizes values of address offset amount with current address difference, therefore, in the present embodiment
Can directly by two differences, whether size is identical is compared, obtain comparison result.
As a result generation unit 305, the comparison result for being obtained in difference comparing unit 304 meets default address distance
During change condition, the testing result that STW is likely to occur in the JVM is generated.
Wherein, default address distance change condition can be：Address distance between first object and the second object is
It is no to change, that is to say, that the comparison of initial address difference and current address difference between the first object and the second object
It is whether consistent.As whether the offset between the first pointer address and the second pointer address in Fig. 2 changes.
It should be noted that in comparison result, if initial address difference is compared unanimously with current address difference, that is,
Two differences are identical, then may indicate that the distance of the address between the first object and the second object does not change, then show the
There is no the compacting for occurring internal memory to reclaim between one object and the second object, then with regard to not carrying out or occurring STW；If initial
Difference in address compared with current address difference it is inconsistent, that is, two difference differences, then may indicate that the first object and second
Address distance between object changes, now, shows to carry out the pressure of internal memory between the first object and the second object certainly
It is real to reclaim, then may occur STW.
Wherein, the testing result that STW is likely to occur in JVM is represented：STW may be carried out in JVM.
It should be noted that when detecting to be likely to occur STW, completing detection, then can delete two strongly reference objects
That is the first object and the second object, save memory headroom.
A kind of STW detection means provided from such scheme, the embodiment of the present application two is strong by pre-setting two
Reference object, and between strongly reference object after setting weak reference object, the difference in address of two strongly reference objects of monitoring is
The no address distance change condition that meets is (for example, whether the address distance between the first object of monitoring and the second object changes
Deng), and then judge to reclaim either with or without the compacting for carrying out internal memory in JVM, the thus address difference between two strongly reference objects
STW testing result may be carried out by being generated when value changes in JVM, be realized to that whether may carry out STW reality in JVM
When detect.
With reference to the structural representation that Fig. 5 is a kind of STW detection devices that the embodiment of the present application three is provided, apply in JVM,
To be detected in time to whether occurring STW in JVM.
Wherein, the equipment can include following structure：
Memory 501, for storing application program and the produced data of application program operation；
Processor 502, for performing the application program, to realize following functions：Obtain the first object and the second object
The initial address difference between pointer address when being each created, wherein, the first object and the second object are respectively advance wound
Also be pre-created between the strongly reference object built, and the first object and the respective pointer address of the second object at least one the 3rd
Object, the 3rd object is weak reference object, and the first object and the respective current pointer address of the second object are obtained afterwards；Based on
One object and the respective current pointer address of the second object, obtain the current address difference between the first object and the second object；
Initial address difference is compared with current address difference, comparison result is obtained；Comparison result meet default address away from
During from change condition, STW testing result is likely to occur in generation JVM.
The specific implementation of processor may be referred to hereinbefore corresponding embodiment content in the present embodiment, no longer detailed herein
State.
A kind of STW detection devices provided from such scheme, the embodiment of the present application three are strong by pre-setting two
Reference object, and between strongly reference object after setting weak reference object, the difference in address of two strongly reference objects of monitoring is
The no address distance change condition that meets is (for example, whether the address distance between the first object of monitoring and the second object changes
Deng), and then judge to reclaim either with or without the compacting for carrying out internal memory in JVM, the thus address difference between two strongly reference objects
STW testing result may be carried out by being generated when value changes in JVM, be realized to that whether may carry out STW reality in JVM
When detect.
STW detection schemes in the present embodiment may apply in many scenes, by taking kafka clusters as an example：
In kafka clusters, the one of factor for causing leader state changes is exactly that STW occurs for leader, in hair
During raw STW, it is impossible to send heartbeat in time, and do not received in cluster after leader heartbeat, cluster may be caused to re-elect
Go out new leader, so leader nodes need timing to be asked to the pocket transmission of zookeeper collection, confirm its leader state,
Leader resources are consumed, increase zookeeper workloads so that scheme is relatively complicated.
And use after the STW detection schemes in the present embodiment, leader can regularly detect the STW states of oneself, if
Occurred STW, then asked to the pocket transmission of zookeeper collection, so as to reduce zookeeper workloads.
It should be noted that the device of the embodiment of the present application may be provided in the terminal with JVM, there is place in the terminal
Manage device, memory and disk, computing device Object Creation and difference in address are calculated with comparing etc. work.
Kernel is included in processor, is gone in memory to transfer corresponding program unit by kernel.Kernel can set one
Or more, termination function is realized by adjusting kernel parameter, as with creating strongly reference object and weak reference object, acquisition object
Location, calculating difference in address and difference are than equity.
Memory potentially includes the volatile memory in computer-readable medium, random access memory (RAM) and/
Or the form, such as read-only storage (ROM) or flash memory (flash RAM) such as Nonvolatile memory, memory is deposited including at least one
Store up chip.
Present invention also provides a kind of computer program product, it is arranged in the terminal with JVM, when in terminal such as computer
Or when being performed on server, it is adapted for carrying out the program code of initialization there are as below methods step：
The first object and the respective current pointer address of the second object are obtained, wherein, the first object and the second object are distinguished
For the strongly reference object being pre-created in JVM, created in advance on the pointer address in JVM also between the first object and the second object
At least one the 3rd object is had, the 3rd object is weak reference object；Based on the respective current finger of the first object and the second object
Pin address, obtains the current address difference between the first object and the second object；Obtain the first object and the second object each quilt
Initial address difference between pointer address during establishment；Initial address difference is compared with current address difference, obtained
Comparison result；When comparison result meets default address distance change condition, there is STW testing result in generation JVM.
Thus, the present embodiment is set by pre-setting two strongly reference objects in JVM, and between strongly reference object
After weak reference object, whether the difference in address of two strongly reference objects of monitoring meets address distance change condition, such as whether not having
Change, and then judge to reclaim either with or without the compacting for carrying out internal memory in JVM, thus between two strongly reference objects
Difference in address STW testing result was carried out when changing in generation JVM, realize the reality to whether carrying out STW in JVM
When detect.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is the flow with reference to method, equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram are described.It should be understood that every one stream in flow chart and/or block diagram can be realized by computer program instructions
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
In a typical configuration, computing device includes one or more processors (CPU), input/output interface, net
Network interface and internal memory.
Memory potentially includes the volatile memory in computer-readable medium, random access memory (RAM) and/
Or the form, such as read-only storage (ROM) or flash memory (flash RAM) such as Nonvolatile memory.Memory is that computer-readable is situated between
The example of matter.
Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be by any method
Or technology realizes information Store.Information can be computer-readable instruction, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), moved
State random access memory (DRAM), other kinds of random access memory (RAM), read-only storage (ROM), electric erasable
Programmable read only memory (EEPROM), fast flash memory bank or other memory techniques, read-only optical disc read-only storage (CD-ROM),
Digital versatile disc (DVD) or other optical storages, magnetic cassette tape, the storage of tape magnetic rigid disk or other magnetic storage apparatus
Or any other non-transmission medium, the information that can be accessed by a computing device available for storage.Define, calculate according to herein
Machine computer-readable recording medium does not include temporary computer readable media (transitory media), such as data-signal and carrier wave of modulation.
A kind of STW detection methods, device and equipment provided herein are described in detail above, to disclosed
Embodiment described above, professional and technical personnel in the field is realized or use the application.To many of these embodiments
Plant modification to will be apparent for those skilled in the art, generic principles defined herein can be not
In the case of departing from spirit herein or scope, realize in other embodiments.Therefore, the application is not intended to be limited to this
These embodiments shown in text, and it is to fit to the most wide scope consistent with features of novelty with principles disclosed herein.
Claims (9)
1. a kind of STW detection methods, it is characterised in that including：
The initial address difference for obtaining the first object between pointer address when the second object is each created, wherein, it is described
First object and second object are respectively the strongly reference object being pre-created, and first object and second object
At least one the 3rd object is also pre-created between respective pointer address, the 3rd object is weak reference object；
Obtain first object and the respective current pointer address of second object；
Based on first object and the respective current pointer address of second object, first object and described the are obtained
Current address difference between two objects；
The initial address difference is compared with the current address difference, comparison result is obtained；
When the comparison result meets default address distance change condition, the detection that STW is likely to occur in the JVM is generated
As a result.
2. according to the method described in claim 1, it is characterised in that the address distance change condition is：First object
Address distance between second object changes；
The comparison result meets default address distance change condition, including：
The comparison result shows the initial address difference and current address difference ratio of first object and second object
To inconsistent.
3. according to the method described in claim 1, it is characterised in that the acquisition first object and second object are each
From current pointer address, including：
Using JNI methods, first object and the respective current pointer address of second object are obtained.
4. according to the method described in claim 1, it is characterised in that described each based on first object and second object
From current pointer address, obtain the current address difference between first object and second object, including：
The value of the current pointer address of second object is subtracted to the value of the current pointer address of first object, obtained
To value subtraction result；
Take the absolute value of the value subtraction result poor as the current address between first object and second object
Value.
5. a kind of STW detection means, it is characterised in that including：
It is first between initial difference acquiring unit, pointer address when being each created for the first object of acquisition and the second object
Beginning difference in address, wherein, first object and second object are respectively the strongly reference object being pre-created, and described the
At least one the 3rd object, described 3rd pair have also been pre-created between one object and the respective pointer address of the second object
As for weak reference object；
Address acquisition unit, for obtaining first object and the respective current pointer address of second object；
Current difference acquiring unit, for based on first object and the respective current pointer address of second object, obtaining
Take the current address difference between first object and second object；
Difference comparing unit, for the initial address difference to be compared with the current address difference, obtains comparing knot
Really；
As a result generation unit, for when the comparison result meets default address distance change condition, generating in the JVM
It is likely to occur STW testing result.
6. device according to claim 5, it is characterised in that the address distance change condition is：First object
Address distance between second object changes；
The result generation unit specifically for：Show first object with second object initially in comparison result
When location difference compares inconsistent with current address difference, the testing result that STW is likely to occur in the JVM is generated.
7. device according to claim 5, it is characterised in that the address acquisition unit specifically for：Utilize JNI side
Method, obtains first object and the respective current pointer address of second object.
8. device according to claim 5, it is characterised in that the current difference acquiring unit includes：
Magnitude calculation subelement, for the value of the current pointer address of second object to be subtracted into working as first object
The value of prior pointer address, obtains value subtraction result；
Take absolute value subelement, for taking the absolute value of the value subtraction result as first object and described second pair
Current address difference as between.
9. a kind of STW detection devices, it is characterised in that including：
Memory, for storing application program and the produced data of application program operation；
Processor, for performing the application program, to realize following functions：The first object is obtained each to be created with the second object
Initial address difference between pointer address when building, wherein, first object and second object are respectively advance wound
Also it has been pre-created at least between the strongly reference object built, and first object and the respective pointer address of the second object
One the 3rd object, the 3rd object is weak reference object；Obtain first object and second object it is respective work as
Prior pointer address；Based on first object and the respective current pointer address of second object, first object is obtained
With the current address difference between second object；The initial address difference is compared with the current address difference
It is right, obtain comparison result；When the comparison result meets default address distance change condition, generating may in the JVM
There is STW testing result.
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