CN105472034B - The load-balancing method of mobility is reduced in a kind of multiserver DVE systems - Google Patents
The load-balancing method of mobility is reduced in a kind of multiserver DVE systems Download PDFInfo
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- CN105472034B CN105472034B CN201610000833.7A CN201610000833A CN105472034B CN 105472034 B CN105472034 B CN 105472034B CN 201610000833 A CN201610000833 A CN 201610000833A CN 105472034 B CN105472034 B CN 105472034B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
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Abstract
The invention discloses the load-balancing method for reducing mobility in a kind of multiserver DVE systems, step includes：The two-dimensional space of virtual environment is divided into multiple regions with same size according to number of servers in advance, each region is made of the block of the square with same size；Obtained region will be divided and be individually assigned to different servers；During multiserver DVE system operations, each server checks own load, if load exceeds preset load threshold, then the alternative migration block of institute's distribution region is ranked up according to the migration block selection principle of curstomer-oriented end mobility, and is sent to the server for safeguarding adjacent area according to ranking results selection block.The present invention is fast with load balancing process speed, effect is good, can reduce client mobility, the operation expense for reducing system, the advantage that user's actual experience is good, applicability is good.
Description
Technical field
The present invention relates to the load-balancing techniques in MultiServer Structure DVE systems, and in particular to a kind of multiserver DVE
The load-balancing method of mobility is reduced in system.
Background technology
Distributed virtual environment (Distributed Virtual Environment, abbreviation DVE) system is a kind of
Real-time network interactive environment based on virtual reality technology and network technology, it is by being distributed between the calculate node of various regions
Being distributed in more calculate nodes for task is completed in communication, the locally or globally data information of shared virtual environment, collaboration, gives user
A kind of whole, the true, Virtual Space that can immerse is provided.Distributed virtual environment technology is adapted to due to its favorable expandability
The features such as property is wide, has obtained extensively in Military Simulation, network amusement, long-distance education, engineering design and e-commerce etc.
General application.In recent years, along with the drastically expansion of Distributed Virtual Environment System application scale, the real-time of user's interaction is wanted
Ask continuous improvement, the scalability problem getting worse of system traditional to load energy based on the DVE system architectures of single server
Power, response time etc. are difficult to meet the functional requirement of system.Therefore, the multiserver based on distributed server architecture
DVE systems have been increasingly becoming the research hotspot of academia and industrial quarters.
As shown in Figure 1, in existing certain multiserver DVE systems, entire virtual environment system by high speed by being interconnected
The multiple servers that network is connected with each other（Server#1~Server#4）It is common to safeguard.When system scale increases, Ke Yitong
It crosses and increases number of servers to improve the integrity service ability of system, therefore its autgmentability will be substantially better than single server architecture
DVE systems.However, relative to single server architecture, MultiServer Structure DVE systems will provide reliable and stable service, need
Solve series of technical.Wherein, the problem of load balancing between each server is to influence system availability and user
The key problem of experience, due to the mobility of each client controlled entity in virtual environment system, each server is actually responsible for
Client terminal quantity can constantly change, therefore its loading condition also can constantly change.When the load of certain server
When more than its load capacity upper limit, the response demand for the client being responsible for will be unable to be met, and exist to influence user
Interactive experience in system.Therefore, how the load balance between the runtime effectively realizes multiserver, just become influence
One key element of multiserver virtual environment system availability.
Current existing load-balancing method is primary concern is that the efficiency of balancing procedure and the validity of equilibrium result, i.e.,
How in a relatively short period of time, the load balance between different server is realized.However in fact, load balancing process can be to void
The space in near-ring border divides and brings variation, to be had an impact to the migration situation of the clients entities in virtual environment.If
Virtual Space is divided into multiple scrappy fritters, then clients entities just have prodigious probability from a server migration to
Another server, and the on the one hand transition process of client can bring prodigious overhead, on the other hand also can to
The actual experience at family affects.Therefore, how to reduce the mobility of client as far as possible during load balancing, just at
In order to which DVE systems need the critical issue solved under MultiServer Structure.
Invention content
The technical problem to be solved in the present invention：For the above problem of the prior art, a kind of load balancing process speed is provided
Degree is fast, effect is good, can reduce that client mobility, the operation expense for reducing system, user's actual experience is good, applicability is good
The load-balancing method of mobility is reduced in multiserver DVE systems.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
The load-balancing method of mobility is reduced in a kind of multiserver DVE systems, step includes：
1）Before multiserver DVE system operations, the two-dimensional space of virtual environment is divided according to number of servers in advance
For multiple regions with same size, each region is made of the block of the square with same size, the pros
The block of shape carries out the least unit of two-dimensional space migration between different server during load balancing；Division is obtained
Region is individually assigned to different servers, and each server is responsible for safeguarding that institute's distribution region and the client run thereon are real
Body；
2）During multiserver DVE system operations, each server periodically checks the loading condition of itself, if
Load exceeds preset load threshold, then according to the migration block selection principle of curstomer-oriented end mobility to institute's distribution region
Alternative migration block is ranked up, and the server for safeguarding adjacent area is sent to according to ranking results selection block.
Preferably, the step 2）Detailed step include：
2.1）During multiserver DVE system operations, each current server periodically checks the load feelings of oneself
Condition, judges whether the load of itself exceeds preset load threshold, is jumped if the load of itself is beyond preset load threshold
Turn to execute step 2.2）, otherwise redirected in next cycle and execute step 2.1）；
2.2）Current server to safeguarded in the two-dimensional space of virtual environment adjacent area server send load hair
Request is sent, load is received and sends the server asked and given according to itself current loading condition and feed back, if being currently in low-load
Situation, which is then fed back, to be received, and otherwise feedback can not receive；
2.3）Current server receives the feedback from other servers, can not be received currently if other servers are fed back
The load of server, then the load balancing process suspension in this period, redirects in next period and executes step 2.1）, otherwise current to take
Business device, which selects alternatively to migrate block from the region of self maintained, is ready for load migration；
2.4）Current server according to the migration block selection principle of curstomer-oriented end mobility to alternatively migrate block into
Row sequence；
2.5）Current server selects block to be sent to feedback according to ranking results can receive the server implementation of load
Migration；
2.6）Current server judges whether the loading condition of itself still exceeds preset load threshold, if still super
Go out preset load threshold, then redirects and execute step 2.4）；Otherwise transition process terminates, and execution step is redirected in next cycle
2.1）.
Preferably, the step 2.4）Detailed step include：
2.4.1）It is ranked up by the sequence of boundary line adjusted value from low to high to alternatively migrating block, the boundary line tune
Whole value subtracts by an alternative transition process of migration block region boundary line quantity of being moved out and moves into region boundary line quantity and obtain
The result arrived；
2.4.2）It sorts from high in the end according to rectangular adjusted value for the identical alternative migration block of boundary line adjusted value, institute
It states rectangular adjusted value and is moved out by an alternative transition process of migration block and the rectangular index in region divided by move into the rectangular finger in region
Number obtain as a result, the rectangular index be the alternative migration block distance areas central point in horizontal and vertical directions
The maximum value of distance divided by the evolution value of region area, when the evolution value of region area is that the region is fitted to virtual square
The length of side.
The load-balancing method tool that mobility is reduced in multiserver DVE systems of the present invention has the advantage that：Face of the present invention
The critical issue problem of load balancing that system availability and user's actual experience are influenced into MultiServer Structure DVE systems,
While keeping the advantage that other load-balancing methods are efficient, equilibrium result is good, equilibrium result is further contemplated to virtual
The influence that space divides optimizes load balancing process by introducing the decision principles such as boundary line rule and rectangular rule,
Allow the result of load balancing to reduce the probability that client migrates between the multiple servers of virtual environment system, reduces
The operation expense of system, improves the actual experience of user, to improve the availability of system on the whole.In addition, this method
Expense is small in the process of running, and is that operation is distributed on multiple servers, "bottleneck" problem is not present, for having on a large scale
Have more preferable compared with the Distributed Virtual Environment System applicability of multiserver, has that load balancing process speed is fast, effect is good, it can
Reduce client mobility, the operation expense for reducing system, the advantage that user's actual experience is good, applicability is good.
Description of the drawings
Fig. 1 is the structural schematic diagram of existing multiserver DVE systems.
Fig. 2 is the basic procedure schematic diagram of present invention method.
Fig. 3 is step 2 of the embodiment of the present invention）Basic procedure schematic diagram.
Specific implementation mode
As shown in Fig. 2, the step of reducing the load-balancing method of mobility in the present embodiment multiserver DVE systems, wraps
It includes：
1）Before multiserver DVE system operations, the two-dimensional space of virtual environment is divided according to number of servers in advance
For multiple regions with same size, each region is made of the block of the square with same size, square
Block carries out the least unit of two-dimensional space migration between different server during load balancing；The region that division is obtained
It is individually assigned to different servers, each server is responsible for the clients entities safeguarded institute's distribution region and run thereon；
2）During multiserver DVE system operations, each server periodically checks the loading condition of itself, if
Load exceeds preset load threshold, then according to the migration block selection principle of curstomer-oriented end mobility to institute's distribution region
Alternative migration block is ranked up, and the server for safeguarding adjacent area is sent to according to ranking results selection block, to avoid
The generation of overload situations.
As shown in figure 3, step 2）Detailed step include：
2.1）During multiserver DVE system operations, each current server periodically checks the load feelings of oneself
Condition, judges whether the load of itself exceeds preset load threshold, is jumped if the load of itself is beyond preset load threshold
Turn to execute step 2.2）, otherwise redirected in next cycle and execute step 2.1）；
2.2）Current server to safeguarded in the two-dimensional space of virtual environment adjacent area server send load hair
Request is sent, load is received and sends the server asked and given according to itself current loading condition and feed back, if being currently in low-load
Situation, which is then fed back, to be received, and otherwise feedback can not receive；
2.3）Current server receives the feedback from other servers, can not be received currently if other servers are fed back
The load of server, then the load balancing process suspension in this period, redirects in next period and executes step 2.1）, otherwise current to take
Business device, which selects alternatively to migrate block from the region of self maintained, is ready for load migration；
2.4）Current server according to the migration block selection principle of curstomer-oriented end mobility to alternatively migrate block into
Row sequence；
2.5）Current server selects block to be sent to feedback according to ranking results can receive the server implementation of load
Migration；
2.6）Current server judges whether the loading condition of itself still exceeds preset load threshold, if still super
Go out preset load threshold, then redirects and execute step 2.4）；Otherwise transition process terminates, and execution step is redirected in next cycle
2.1）.
In the present embodiment, step 2.4）Detailed step include：
2.4.1）It is ranked up by the sequence of boundary line adjusted value from low to high to alternatively migrating block, boundary line adjusted value
It is subtracted for the moved out region boundary line quantity of alternative migration transition process of block and moves into what region boundary line quantity obtained
As a result；
2.4.2）It sorts from high in the end according to rectangular adjusted value for the identical alternative migration block of boundary line adjusted value, side
Shape adjusted value is moved out by an alternative transition process of migration block and the rectangular index in region divided by moves into the rectangular index in region and obtain
It is arriving as a result, rectangular index be this it is alternative migration block distance areas central point horizontal and vertical directions distance most
Big value divided by the evolution value of region area, the evolution value of region area are the length of side when region is fitted to virtual square.
For the clients entities run in virtual environment, if it has passed through the area that a server is safeguarded
The cross-server migration of client will occur for the boundary in domain, i.e., the client is converted to from the maintenance area of a server
The maintenance area of another server.This process will produce larger overhead, and influence the user experience of user, because
We need to reduce the probability of this transition process as far as possible for this.In fact, the probability and multiple servers of client migration
Boundary length between maintenance area is closely bound up, and the boundary length between region is longer, and the probability of client migration is bigger.
Therefore, it to reduce the probability of client migration, needs to reduce the boundary length between multiple regions as far as possible.For this purpose, this hair
Bright embodiment designs a kind of migration block selection principle based on client mobility, and it includes following two specific rules：
I）Boundary line rule, referring to step 2.4.1）, in particular to alternatively migrating block by boundary line adjusted value by low
It is ranked up to high sequence.For a specific migration block, its transition process can only influence server of moving out
And the border condition of server is moved into, the border condition without influencing other servers.Specifically, in this time transition process
In, migration block and move into server institute maintenance area boundary line will disappear, and with the friendship for server institute maintenance area of moving out
Boundary line will become new boundary.Therefore this time transition process, caused boundary line length varying value are exactly the block and move
The quantity for going out the boundary line of server subtracts and moves into the quantity of the boundary line of server, and we term it the boundaries of this block
Line adjusted value, i.e. boundary line adjusted value=region boundary line quantity of moving out-move into region boundary line quantity.Boundary line adjusted value is
When positive value, illustrate that this time migration increases the entire length of boundary line, and when being negative value, illustrate this time to migrate and reduce side
The entire length in boundary line.For example, if only 1 side connects between some migration block and server maintenance area of moving out, and
There are 3 sides to connect with moving between server maintenance area, then its boundary line adjusted value is -2, illustrates that this time migration will
Reduce whole boundary 2 units of line length.As it can be seen that the lower boundary line adjusted value the better, therefore we are to all potential migrations
It when block sorts, needs to be ranked up from low to high according to boundary line adjusted value, migrates the low area of boundary line adjusted value as far as possible
Block.
II）Rectangular rule, referring to step 2.4.2）, in particular to for the identical alternative migration block of boundary line adjusted value
It sorts from high in the end according to rectangular adjusted value.The basic ideas of rectangular rule are in transition process, and will move out service as far as possible
The region that device is safeguarded and the region for moving into server maintenance are fitted to square.This is because coming for all sliceable figures
It says, square perimeter area ratio is 4/ length of side, has lower perimeter area ratio compared with other most of shapes, i.e., same
The maintenance area of size possesses shorter boundary line.For example, for a square area, if to be divided into four parts,
It is divided into twice that total boundary line that the division methods of 4 small square obtain is the length of side, and if be divided into from top to bottom
4 rectangles then total boundary length just becomes for three times of the length of side, here it is due to square rectangle more unequal than length and width
With lower perimeter area ratio.In fact, for square, round and regular hexagon has smaller perimeter area
Than, but circle is not sliceable figure, the boundary line of each region can not share, and regular hexagon is small for base unit
It is difficult to completely splice for square, is more suitable for the Virtual Space using regular hexagon as base unit.For this purpose, the present invention retouches
It states with the rectangular the rule of fitting for target, concrete methods of realizing is equally the rectangular adjusted value for calculating the block, and computational methods are
It calculates separately some migration block and server maintenance area and moves into the rectangular index of server maintenance area moving out, the two
Quotient is square adjusted value, i.e., rectangular adjusted value, and=the rectangular index in region of moving out/moves into the rectangular index in region.The meter of rectangular index
Calculation method is maximum value divided by region area of the block distance areas central point in the distance of horizontal and vertical directions（I.e.
Total number of blocks）Evolution value, the evolution value of wherein region area represents the side when region is fitted to virtual square
It is long, therefore rectangular index represents the block and is fitted the influence degree being square to region in the zone, it is bigger to illustrate to influence more
Greatly.Therefore rectangular adjusted value is bigger, and representing the block influences the side of moving out bigger, and smaller on the side's of moving into influence, therefore we are more
Tend to migrate this kind of block.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (1)
1. reducing the load-balancing method of mobility in a kind of multiserver DVE systems, it is characterised in that step includes：
1）Before multiserver DVE system operations, the two-dimensional space of virtual environment is divided into according to number of servers in advance more
A region with same size, the multiserver DVE systems refer to multi-server Distributed virtual environment system, Mei Gequ
Domain is all made of the block of the square with same size, and the block of the square is different services during load balancing
The least unit of two-dimensional space migration is carried out between device；Obtained region will be divided and be individually assigned to different servers, each
Server is responsible for the clients entities safeguarded institute's distribution region and run thereon；
2）During multiserver DVE system operations, each server periodically checks the loading condition of itself, if load
Beyond preset load threshold, then according to the migration block selection principle of curstomer-oriented end mobility to the alternative of institute's distribution region
Migration block is ranked up, and the server for safeguarding adjacent area is sent to according to ranking results selection block；
The step 2）Detailed step include：
2.1）During multiserver DVE system operations, each server periodically checks the loading condition of oneself, judges certainly
Whether the load of body exceeds preset load threshold, and execution step is redirected if the load of itself is beyond preset load threshold
2.2）, otherwise redirected in next cycle and execute step 2.1）；
2.2）Current server to safeguarded in the two-dimensional space of virtual environment adjacent area server send load send ask
It asks, receives load and send the server asked and given according to itself current loading condition and feed back, if being currently in low-load situation
Then feedback can receive, and otherwise feedback can not receive；
2.3）Current server receives the feedback from other servers, if other servers, which are fed back, can not receive current service
The load of device, then the load balancing process suspension in this period, redirects in next period and executes step 2.1）, otherwise current server
Alternative migration block is selected to be ready for load migration from the region of self maintained；
2.4）Current server is arranged according to the migration block selection principle of curstomer-oriented end mobility alternatively migrating block
Sequence；
2.5）Current server selects block to be sent to feedback according to ranking results can receive the server implementation migration of load；
2.6）Current server judges whether the loading condition of itself still exceeds preset load threshold, if still exceeded pre-
If load threshold, then redirect execute step 2.4）；Otherwise transition process terminates, and execution step is redirected in next cycle
2.1）；
The step 2.4）Detailed step include：
2.4.1）It is ranked up by the sequence of boundary line adjusted value from low to high to alternatively migrating block, the boundary line adjusted value
It is subtracted for the moved out region boundary line quantity of alternative migration transition process of block and moves into what region boundary line quantity obtained
As a result；
2.4.2）It sorts from high in the end according to rectangular adjusted value for the identical alternative migration block of boundary line adjusted value, the side
Shape adjusted value is moved out by an alternative transition process of migration block and the rectangular index in region divided by moves into the rectangular index in region and obtain
It is arriving as a result, the rectangular index be this it is alternative migration block distance areas central point horizontal and vertical directions distance
Maximum value divided by region area evolution value, the evolution value of region area is the side when region is fitted to virtual square
It is long.
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| CN101009648A (en) * | 2006-12-27 | 2007-08-01 | 北京航空航天大学 | Multi-server hierarchical alterative load balance method |
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|---|---|---|---|---|
| CN101005514A (en) * | 2006-12-27 | 2007-07-25 | 北京航空航天大学 | Multiple server organizing method for network game |
| CN101009648A (en) * | 2006-12-27 | 2007-08-01 | 北京航空航天大学 | Multi-server hierarchical alterative load balance method |
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