Abstract:
A trigger method of computational procedure for virtual machine migration is disclosed. A cloud server simultaneously receives reply connection data from a client end host, and determines if the computational procedure for migration virtual machines is initiated according to the connection data. The virtual machines migration is performed upon the computational procedure completed, wherein, the browser intercepts the connection data to reply to the server when client end host accessing to web page via browser. The reply connection data from the client end host is used for the determining if the computational procedure is initiated or not so as to lower the server computation loading by reducing the computational procedures performed.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to computational procedure for virtual machine migration used on servers, in particular it relates to a trigger method to determine when to initiate computational procedure for virtual machine migration. 
         [0003]    2. Description of Prior Art 
         [0004]    As the semiconductor industry develops the capabilities of computer increases rapidly in recent years. Accordingly, the processing efficiency and speeds of a server also grow significantly. 
         [0005]    In terms of increasing server efficiency, virtual servers are gradually becoming popular. The concept of virtual servers refers to that many virtual machines (VM) are programmed in a physical server and the multiple VMs simultaneously execute multiple service procedures. An administrator maintains one physical server and is able to provide different service procedures to server users via multiple VMs, which lowers the cost of manpower, space and electrical power. The virtual machines individually work with different operating system (OS), which expand the compatibility of the server to meet the requirements of different server users. 
         [0006]    The multiple virtual machines on the server share the physical memory of the server for executing the service procedures. VM is useful when certain service procedure is simultaneously used by too many users and occupies the majority of the physical memory in the server, or when one of the virtual machines has heavy computing loading which may lead to network congestion or overheated servers and impact on the overall processing efficiency. 
         [0007]    In view of that, a plurality of servers in a system is scheduled with periodic virtual machines migration. The system executes computational procedure based on the using status of the VMs. The computational procedure individually computes the most suitable location to migrate the VMs. The system moves the VMs to the most suitable locations based on calculation results. In further details, the computational procedure moves the memory data processed in the servers to the suitable server to continue with the processing based on the calculation results. 
         [0008]    The above computational procedure calculates according to the network speed, the CPU capability, the memory usage status, the temperature, the humidity of the location, or the rack location of each server. The computing result indicates which server is the most suitable server to process the VMs. The system then moves the VMs, i.e. the processing memory data in the server, to the most suitable location based on the calculation results. 
         [0009]    For example, service procedures used by many people typically takes up larger memory space and more CPU resource. After the computing, the servers may become overheated as a result. The computational procedure selects a server at a location with better ventilation, better air conditioning, lower temperature and lower hardware computing loading to be server processing the above mentioned service procedure. 
         [0010]    To assure the servers of a system continue to deliver the best connection quality, the above mentioned computational procedure is executed periodically, for example, once every ten or twenty seconds. The system executes migration after the computing. Nonetheless, when there are more factors taken in the computational procedure, the computation load and the occupied system resource grows. If the frequency of executing the computational procedures is high, the server resource is heavily occupied which is counterproductive by lowering the users&#39; share of the server. 
         [0011]    Thus, it is desired in the market to provide an innovative mechanism to assure the server effectively determining the timing to execute the computational procedure and optimize virtual machines, and does not in appropriately occupy server resource by frequently executing the computational procedure. 
       SUMMARY OF THE INVENTION 
       [0012]    The primary objective of the present invention is provide a trigger method of computational procedure for virtual machine migration and an application program for the same to effectively determining the when to initiate the computational procedure. 
         [0013]    In order to achieve the above objective, a cloud server is used to simultaneously receive reply connection data from a client end host, and determining if it is required to initiate computational procedure of virtual machine migration based on the connection data. The virtual machine migration is executed after the computational procedure completes. The client end host accesses to web page via the browser and the browser intercepts the above mentioned connection data to reply to the server. 
         [0014]    Compare with the prior art, the present invention provides advantages including that the server end continues to receive the reply connection data from the client end host, determine when to initiate the computational procedure based on connection data and execute the virtual machines migration after the computing. Thus, computational procedures are executed only when the system determines that the computational procedures are required which keep the server resource from occupying by executing the computational procedures. 
         [0015]    In addition, to assure the best connection quality provided by the server, the server periodically executes the computational procedure. With the method of the present invention, the periodic execution interval can be longer, for example from once every several seconds to once every several minutes so as to avoid the limited server resource is consumed by the massive computation load created by frequent execution of the computational procedure. 
     
    
     
       BRIEF DESCRIPTION OF DRAWING 
         [0016]    The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, may be best understood by reference to the following detailed description of the invention, which describes an exemplary embodiment of the invention, taken in conjunction with the accompanying drawings, in which: 
           [0017]      FIG. 1  is a system architecture diagram of a preferred embodiment according to the present invention; 
           [0018]      FIG. 2  is a schematic diagram of accessing web page of a preferred embodiment according to the present invention; 
           [0019]      FIG. 3  is a schematic diagram of accessing web page of the other preferred embodiment according to the present invention; 
           [0020]      FIG. 4  is a judgment flowchart e of a preferred embodiment according to the present invention; 
           [0021]      FIG. 5A  is a reply flowchart e of a preferred embodiment according to the present invention; and 
           [0022]      FIG. 5B  is a reply flowchart e of the other preferred embodiment according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0023]    In cooperation with attached drawings, the technical contents and detailed description of the present invention are described thereinafter according to preferable embodiments 
         [0024]      FIG. 1  is a system architecture diagram of a preferred embodiment according to the present invention. An application program  111  is installed in a plurality of cloud servers  1 . In further details, the plurality of servers  1  comprise a monitor server  11 . The application program  111  is installed in the monitor server  11 . When the application program  111  is loaded and executed at the monitor server  11 , the monitor server  11  is able to execute the trigger method of computational procedure for virtual machine migration according to the present invention. 
         [0025]    At least one virtual machine (Virtual Machine, VM) is individually provided in the plurality of servers  1 , and the virtual machines individually provide service procedures. The plurality of servers  1  individually connected with the monitor server  11 , and an application program  10  is individually installed in each server  1 . Each server  1  individually intercepts the internal server data D 1  via the application program  10 , for example the network speed, the CPU capability, the memory usage status, the temperature, the humidity of the location, or the rack location of each server, and transfers the server data D 1  to the monitor server  11 . Thus, before each server  1  performs the virtual machine migration, one of the plurality of servers  1  executes computational procedure for the virtual machines migration based on the server data D 1  for indicating the most suitable location for executing each virtual machine. Then each virtual machines migration is performed based on the calculation result. 
         [0026]    It should be mentioned that the computational procedure is executed by the monitor server  11 . As a matter of fact, the computational procedure can also be executed by any of the plurality of servers  1 , and is not limited thereto. In the present embodiment, the quantity of the plurality of servers  1  is three (including two servers  1  and a monitor server  11 ), the quantity of the servers  1  is subject to requirements and is not limited thereto. 
         [0027]    The client end  20  connects to the virtual machines of each server  1  via at least one client end host  2 , such as a desktop, a tablet and smart phone, for using service procedures provided by the virtual machines, such as accessing to web page or read/write to web hard drive etc. In the present invention, when the client end hosts  2  connects to the plurality of servers  1  for using the service procedure, the client end hosts  2  intercepts a connection data I 1  (for example reply time of the web page, or satisfaction survey results of users). The connection data I 1  is replied to one of the plurality of servers  1  and specifically replied to the monitor server  11 . The monitor server  11  calculates on the plurality of the connection data I 1  from the client end hosts  2  for determining if executing the above mentioned computational procedure or not. 
         [0028]      FIG. 4  is a judgment flowchart e of a preferred embodiment according to the present invention. First, one of the plurality of servers  1  receives the connection data I 1  from each client end host  2  (step S 40 ). Specifically, the monitor server  11  receives the connection data I 1 . Next, the monitor server  11  calculates on the received plurality of the connection data I 1  (step S 42 ) and determines if the connection data I 1  reaches a predetermined threshold value based on calculation results (step S 44 ). 
         [0029]    In the embodiment, the monitor server  11  is pre-installed with at least one profile  112  (the profile  112  shown in  FIG. 1 ). The conditions to execute the computational procedure is predetermined by the administrator are recorded in the profile  112 . In the step S 44 , the monitor server  11  compares the connection data I 1  with the profile  112  after the calculation for determining if the connection data I 1  reaches the predetermined threshold value. It should be mentioned that the monitor server  11  may comprise multiple profiles  112 . Each profile  112  has execution conditions individually corresponding to different service procedures. The connection data I 1  replied from each client end host  2  may comprise connection addresses from each client end host  2 . The monitor server  11  intercepts the connection address from the received connection data I 1  for determining the client end host  2  should connect to which service procedure, and further determining which profile  112  to compare with. 
         [0030]    For example, when the client end host  2  accesses to a text web page, the reply time is typically short. In contrast, when the client end host  2  accesses to a web page using many FLASH animations, the reply time may be long. Accordingly, the monitor server  11  is installed with the profile  112  with more strict execute conditions (for example, the executing conditions are more than 2% of the total user quantity, and the reply time is longer than 1 second), and also installed with the other profile  112  with less strict execute conditions (for example, the executing conditions are more than 5% of the total user quantity and the reply time is longer than 3 seconds). The monitor server  11  selects different profile  112  to perform comparison for determining if it is required to execute the computational procedure based on different service procedures the client end host  2  connects to. 
         [0031]    After the step S 44 , if the monitor server  11  determines the connection data I 1  does not reach the predetermined threshold value, the method moves back to the step S 40  and continues to receive, calculate and analyze on the connection data I 1  replied from each client end host  2 . 
         [0032]    If the monitor server  11  determines that the connection data I 1  reaches the predetermined threshold value in the step S 44 , one of the plurality of servers  1  is triggered to initiate the computational procedure for virtual machine migration (step S 46 ). Specifically, g triggering the monitor server  11  is triggered to execute the above mentioned computational procedure, but is not limited thereto. After the step S 46 , the plurality of servers  1  perform the virtual machine migration based on the calculation results of the computational procedure. When the computational procedure or the migration is completed, the method moves back to the step S 40 , the monitor server  11  continues to receive the connection data I 1  from each client end host  2 . 
         [0033]    Nonetheless, in order to provide the best connection quality to the servers  1 , one of the servers  1  (or the monitor server  11 ) is required to periodically execute the computational procedure for virtual machine migration (step S 48 ). The monitor server  11  efficiently determines when to execute the computational procedure based on the connection data I 1  replied from the client end hosts  2  the trigger method of the present invention. Though, it is required to execute the computational procedure periodically executing, the executing interval is configurable to a longer time period, for example from once every ten or twenty seconds to once every several minutes or tens of minutes without impacting on the safety and connection quality of the servers  1 . The resource of the servers  1  is spared and the efficiency of the servers  1  is not influenced by the frequent execution of the computational procedure. 
         [0034]      FIG. 2  and  FIG. 5A  are a schematic diagram and a reply flowchart of a preferred embodiment according to the present invention. As shown in the diagrams, the client end host  2  provides a browser  22 , and users connect to service procedures provided by each server  1  via the browser  22 , for example accessing to a web page  31 . In the process of accessing to the web page  3 , the connection data I 1  is replied to the monitor server  11 . In the example shown in the  FIG. 2 , the browser  22  accesses to the homepage of Delta Electronics, Inc. 
         [0035]    As shown in  FIG. 5A , the client end host  2  first accesses to the web page  31  via the browser  22  (step S 50 ). Next, the browser  22  intercepts reply time of the web page  31  (step S 52 ). As shown in  FIG. 1 , each client end host  2  is individually installed with an application program  21 . Specifically, the application program  21  is installed in the browser  22 . In the step S 52 , each client end host  2  intercepting the reply time of the web page  31  via the application program  21  in the browser  22 . Lastly, each client end host  2  defines the intercepting reply time as the connection data I 1  to reply to the monitor server  11  (step S 54 ). 
         [0036]    The reply time in the embodiment refers to the time starting from the browser  22  accessing to the web page  31  to completely launching the web page  31 . For example, if the time starting from entering the web address of the web page  31  in the browser  22  to completely launching the web page  31  is 0.5 second, the reply time is determined as 0.5 second by the application program  21 . 
         [0037]    In the profile  112  of the monitor server  11 , the executing conditions of the computational procedure are predetermined (i.e., the condition for determining if the predetermined threshold value is reached). In the embodiment, the execution conditions are for example a proportion and a time limit. The client end host  2  considers the reply time as the connection data I 1  to reply. When the proportion of the client end hosts  2  replying with the connection data I 1  is higher than or equal to the predetermined proportion and the reply time in the connection data I 1  is longer than the time limit, the predetermined threshold value is considered reached in the step S 44 . 
         [0038]    For example, the administrator sets the proportion as 5% and the time limit as 0.5 second in the profile  112 . The quantity of the client end hosts  2  is one hundred. The predetermined threshold value is reached when there are more than or equals to five client end hosts  2  replying with the connection data I 1 , and reply time of the connection data I 1  is longer than 0.5 second. Then, the computational procedure and the migration are executed. The above embodiment is one of the preferred embodiments of the present invention and the scope of the invention is not limited thereto. 
         [0039]      FIG. 3  and  FIG. 5B  are a schematic diagram and a reply flowchart of a preferred embodiment according to the present invention. In addition to automatically intercepting the reply time via the browser  22  and the application program  21 , users are allowed to manually reply the connection data I 1 . 
         [0040]    First, the client end host  2  launches a reply web page  32  via the browser  22  of the client end host  2  (step S 60 ). Select one of the options in the connection satisfaction survey  4  on the reply web page  32  (step S 62 ). The reply web page  32  is a web page made by the provider of the server  1 , the reply web page  32  provides several icons representing the options of connection satisfaction survey  4  to the users for selection. As shown in Fig., the options of connection satisfaction survey  4  include option-connection is good  41 , option-connection is acceptable  42 , and option-connection is slow  43  etc. but are not limited thereto. In the step S 62 , users control input devices of the client end host  2  such as a mouse, a keyboard, a touch screen for selecting one of the options in the connection satisfaction survey  4 . Lastly, the option selected by each client end host  2  is used as the connection data I 1  to reply to the monitor server  11  (step S 64 ). 
         [0041]    As mentioned above, the executing condition of the computational procedure is predetermined in the profile  112  of the monitor server  11 . In the embodiment, the condition is a proportion. When the proportion of the client end host  2  selecting the option-connection is slow  43  is higher than or equal to the predetermined proportion, the connection data I 1  is determined to reach the predetermined threshold value in the step S 44 . 
         [0042]    For example, the administrator set the proportion as 10% and the quantity of the client end hosts  2  is a hundred. When there are more than or above ten client end hosts  2  launching the reply web page  32 , and selecting the option-connection is slow  43  on the reply web page  32 , the monitor server  11  receives and calculates on the connection data I 1 . The calculation results indicate that the predetermined threshold value is reached and determines the computational procedure is required to be executed. The above example is one of the preferred embodiments according to the present invention and the scope of the invention is not limited thereto. 
         [0043]    As mentioned above, the monitor server  11  is installed with the application program  111 . When the application program  111  is loaded and executed at the monitor server  11 , the monitor server  11  executes the above mentioned trigger method of computational procedure for virtual machine migration. The trigger method comprises the following steps: a) receiving reply connection data from at least one client end host  2 ; b) performing calculation on a plurality of the connection data; c) determining if the connection data reaches a predetermined threshold value; and d) triggering one of the plurality of servers  1  to initiate the computational procedure for migration of at least one virtual machine if the connection data reaches the predetermined threshold value. 
         [0044]    As mentioned above, the monitor server  11  is further installed with at least one the profile  112 . In the step c, the connection data is compared with the profile  112  for determining if the connection data reach the predetermined threshold value. In further details, a proportion and a time limit are predetermined in the profile  112  in the monitor server  11 . In the step c, when the proportion of the client end hosts  2  replying with the connection data is higher than or equal to the predetermined proportion and the reply time of the connection data is longer than the time limit, the connection data is determined to reach the predetermined threshold value. 
         [0045]    As the skilled person will appreciate, various changes and modifications can be made to the described embodiments. It is intended to include all such variations, modifications and equivalents which fall within the scope of the invention, as defined in the accompanying claims.