CN102307153A - Virtual desktop transmission device and method - Google Patents
Virtual desktop transmission device and method Download PDFInfo
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- CN102307153A CN102307153A CN201110310381A CN201110310381A CN102307153A CN 102307153 A CN102307153 A CN 102307153A CN 201110310381 A CN201110310381 A CN 201110310381A CN 201110310381 A CN201110310381 A CN 201110310381A CN 102307153 A CN102307153 A CN 102307153A
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Abstract
The invention relates to a virtual desktop transmission device and method. The virtual desktop transmission device comprises a client and a virtual desktop server, wherein a response server is also arranged between the client and the virtual desktop server; the response server is used for realizing the load balancing of requests and the buffer of virtual desktop frames. The method provided by the invention comprises the following steps: the client asynchronously sends requests to the response server; the response server sends the requests to the virtual desktop server through a load balancing algorithm; the virtual desktop server sends the virtual desktop frames to the response server; the response server stores the virtual desktop frames in a buffer; and the virtual desktop frames is sent to the client according to the bandwidth conditions of the client. By using the device and method provided by the invention, the transmission performance can be improved, the utilization of resources can be improved and the cost can be reduced.
Description
Technical field
The invention belongs to green calculating, Intel Virtualization Technology and computer internet field, be specifically related to a kind of virtual desktop transmission equipment and method.
Background technology
In recent years, along with cloud computing and mobile Internet emerge rapidly, the virtual desktop technology is more and more universal in the application of enterprise-level.The virtual desktop technology allows the user through long-range connection softward interview user desktop, thereby realizes streamlining management, the solution of purposes such as optimizing resources.This technology is kept apart table for computer plane system and calculating local hardware; Client can be connected on the virtual desktop server through network; Computational logic is moved to the completion of virtual desktop server from this locality; Turn back to this locality by the virtual desktop server again, thereby realize the unified management of computational resource.
The desktop virtual technology will be applied in very many fields widely, for example, the transmission of long-range file data, remote I T technical support, the user visits desktop system from mobile platform.We can say that long-range interconnection technique is one of virtualized core of computer software and hardware.The present long-range Windows of Microsoft operating system mainly contains the remote desktop visit of 3 kinds of technology, and they are: RDP (RDP), virtual network computing (vnc), X – window.One of them popular long-range interconnection technique comprises VNC.VNC is a system, and it uses a software client, shows output through network from the graph image that server sends.Server comprises windows system for the user provides a complete computing environment.
The growth of desktop virtual and universal is because it provides many benefits than traditional Desktop Computing.Advantage comprises and reducing cost, higher fail safe, and ubiquitous visit to resource, and be easy to safeguard.A thin client is a light equipment, is mainly used in the function of graphical display output and user input.Most of user's calculating is on remote server, to carry out.Communication between the thin client and server is to transmit through computer network.
The core of virtual desktop technology can allow the user all be connected to virtual desktop through long-range connection protocol exactly.Yet now the greatest problem of virtual desktop art is exactly that the time delay of picture is big on the market, and favorable user experience can not be provided.Wherein most important reason is that bandwidth ratio network is more limited because the data throughout of virtual desktop is bigger.The mode of a kind of acting server that Sheng Feng Li etc. attempts to propose; But just realized the communication pattern of multi-client to a server; And all clients receive identical information, can be described as a kind of pattern (Sheng Feng Li of collaborative broadcasting; Stafford-Fraser, Q.; Hopper, A.; , " Integrating synchronous and asynchronous collaboration with virtual network computing, "
Internet Computing, IEEE, vol.4, no.3, pp.26-33, May/Jun 2000 doi:10.1109/4236.845387).But still do not solve virtual desktop and be transmitted in the not good problem of user experience under multi-user and the limited bandwidth.
The major technique of current long-range connection, the request that for example VNC is the virtual desktop server end through client are transferred to virtual desktop on the long-range connection software of client and show user (like Fig. 1) with the form of picture frame.The greatest drawback of this technology is:
(1), at least one two-way time (RTT) must be waited for from a time of asking client to receive response.This that is to say that the virtual desktop frame rate has only 1 frame in a two-way time.And if in the higher environment of retardation ratio, mobile Internet for example, this will cause serious virtual desktop time-delay and even the phenomenon of pausing.
(2) because traditional long-range interconnection technique; All responses comprise content of multimedia (literal; Figure; Image, video, 3D recreation ...) be transformed into rest image; If require than higher application to frame rate; For example video and 3D recreation is used desired minimalist configuration because the speed of transmission can not reach far away, and all users also will experience this very serious phenomenon that will cause serious virtual desktop to delay time and even pause.
(3) in recent years, popularizing rapidly of smart mobile phone causes more and more users to be hoped through the long-range connection desktop of intelligent hand.Yet a lot of aspects of the design of existing long-range interconnection technique do not consider that the smart mobile phone user connects the specific (special) requirements of remote desktop under limited bandwidth.Therefore, favorable user experience can not be provided.
(4) long-range interconnection technique (VNC), the virtual desktop server is necessary for each client and responds the virtual desktop request independently.These make that the load of virtual desktop server is very big, can provide the number of users of service also to receive very big restriction at one time, cause transmission quality not good simultaneously, under serious situation, may cause server overload and collapse.
Summary of the invention
In order to solve the problem that prior art exists, the present invention relates to provide a kind of method and apparatus of virtual desktop transmission.Use such method and apparatus, can allow that a plurality of users are connected to virtual desktop under limited bandwidth condition, guarantee the fluency of user experience simultaneously.
The user long-range be connected to virtual desktop in, bad user experience shows: the pause of waits for too long and picture.For performance and the user experience that improves long-range interconnection technique, we have proposed effectively Compression and Transmission rate of the quick transmission technology of novel virtual desktop.What this technology was primarily aimed at present is window operating system, can certainly be applied to other operating system.
Because traditional VNC is a system based on client-requested, that is to say do not have the request virtual desktop server of client can't send the virtual desktop frame.And client at most also can only be sent the renewal request of a virtual desktop frame, changes the response that waiting state is waited for the virtual desktop server then over to.At the network of high latency, this will cause long response time.This invention is to change this client and virtual desktop server sync mode of operation.The substitute is asynchronous mode of operation, just client can be sent a plurality of requests.In this simultaneously, this asynchronous mode of operation also can be brought the problem of other aspects, for example, sends too many requirement and may produce the problem of virtual desktop server overload and even collapse.
Be head it off, the invention provides a kind of novel virtual desktop transmission equipment, this equipment comprises client and virtual desktop server, between client and virtual desktop server, also is provided with response server; The major function of said response server provides the load balancing of request and the buffering of virtual desktop frame.
The invention also discloses virtual desktop transmission method based on above-mentioned virtual desktop transmission equipment; This method comprises the steps: that client sends to response server with request asynchronously; Response server will ask to send the virtual desktop server through the algorithm of load balancing; And the virtual desktop server sends the virtual desktop frame to response server; Response server is stored in the virtual desktop frame in the buffer, and the bandwidth condition according to client sends to client then.
One aspect of the present invention can improve client and send request efficiency, can pass through the transmission rate of the buffer optimization frame of response server on the one hand, thereby plays the function of a network acceleration.Simultaneously, the present invention improves on the virtual desktop transmission means Streaming Media.The difference of Streaming Media transmission is to need to guarantee certain transmission rate and existing higher time delay and shake requirement.When response server has detected the user and needs the transmission of Streaming Media, will open transmission channel through the real-time media transmission control protocol in advance, guarantee the minimal time delay of Streaming Media from the client of virtual desktop Server Transport.
The present invention compared with prior art, beneficial effect is mainly reflected in following aspect:
This technology improves the utilance of resource greatly: response server can be so that a plurality of virtual desktop servers of client-access, also can be so that a plurality of client is visited a virtual desktop server simultaneously, thus reached the maximum use of computational resource.Response server can the dynamic call idling-resource, reduces the server scale, improves resource utilization.
Transmission performance promotes: the speed of request of virtual desktop frame and renewal improves greatly, thereby has shortened user's stand-by period.Through the real user experiment, no matter we is to reduce 30%-50% in the time delay that realizes remote task from the client if finding, and the computing cost of client also significantly reduces, and user experience is strengthened.
Reduce cost: response server can make the multi-user can visit a virtual desktop server, also can visit a plurality of different operating systems.Improve operating efficiency greatly, reduced the overall investment cost.Response server can also be regulated transmission rate dynamically according to no client application and network condition, arrives sharing and distributing rationally of resource.Make the user under the hardware input of trying one's best few, arrive maximized performance.
Description of drawings
Fig. 1 is existing virtual desktop transmission sketch map.
Fig. 2 is a virtual desktop transmission sketch map of the present invention.
Fig. 3 is a virtual desktop transmission equipment sketch map of the present invention.
Fig. 4 is the flow chart that response server received and transmitted the asynchronous request of client.
Fig. 5 is that response server returns virtual desktop frame flow chart.
Embodiment
Virtual desktop transmission equipment structure according to the invention comprises client and virtual desktop server as shown in Figure 3, between client and virtual desktop server, also is provided with response server; Its message transmission as shown in Figure 2, client is sent asynchronous request to response server; Response server is redirected different virtual desktop servers according to the equally loaded algorithm with the asynchronous request of client; The virtual desktop server responds asynchronous request, returns the virtual desktop frame to response server; Response server returns to client with the virtual desktop frame.
Fig. 4 receives and transmits the schematic flow sheet of the asynchronous request of client for response server, and its step is following:
1. open the network requests pond;
2. interception request: monitor the asynchronous request of sending from client;
3. analysis request: the asynchronous request of resolving client;
4. judge it is the client whether asynchronous request makes a fresh start:
(1) if be new client, then add client address and tabulate, the request pond of opening an account new; And execution substep (2);
(2) if not new client, the request load balancing;
(3) transmit queue is asked in interpolation;
5. forward the request to corresponding virtual server;
6. execution in step 2; If end respond services, then turn-off request pond.
Fig. 5 returns virtual desktop frame schematic flow sheet for response server, and its step is following:
1. open and upgrade buffer memory;
2. monitor the virtual desktop frame that sends from the virtual desktop server;
3. inspection client side list:
(1) if the client that the virtual desktop frame returns not in client side list, then abandons the virtual desktop frame, execution in step 7;
(2) inspection client objectives address is if not execution in step 7 then;
4. check the client first rank:
(1) if belong to preferential client, then priority ordering, execution in step 6;
(2) execution in step 5;
5. check the virtual desktop frame type:
(1) if the multimedia frame, multimedia transmission, preset multimedia transmission agreement and passage;
(2) if not, carry out normal transmission;
6. get into transmit queue and transmission;
7. close and upgrade buffering.
Claims (2)
1. a virtual desktop transmission equipment comprises client and virtual desktop server, it is characterized in that between client and virtual desktop server, also being provided with response server; Said response server is to be used to provide the load balancing of request and the buffering of virtual desktop frame.
2. virtual desktop transmission method based on the said virtual desktop transmission equipment of claim 1; This method comprises the steps: that client sends to response server with request asynchronously; Response server will ask to send the virtual desktop server through the algorithm of load balancing; And the virtual desktop server sends the virtual desktop frame to response server; Response server is stored in the virtual desktop frame in the buffer, and the bandwidth condition according to client sends to client then.
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