JP2010050670A - Data communications system, data communications method, and information processing apparatus configuring the data communications system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit and receive data with efficiency and with certainty without missing data due to convergence when executing data transmission requests to a plurality of devices in broadcast communication. <P>SOLUTION: A multicast network group is automatically configured using a number of target devices of a data transmission request, a size of response data for the request, and a buffer memory size of communications equipment such as a switching hub on the network or the like so as not to concentrate data exceeding the buffer memory size, and the data transmission requests are sequentially transmitted in a multicast network unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication congestion control method and system when data is transmitted and received between at least two or more information processing apparatuses using a network, and an apparatus that constitutes the system.

  In a network to which a plurality of information processing devices are connected, when one information processing device requests data transmission to N information processing devices and receives data for N devices, N information processing devices Instead of receiving data by performing one-to-one communication with each device N times, broadcast communication for sending data to all information processing devices connected to the network, or sending data to a plurality of predetermined information processing devices There is a method of making a data transmission request all at once using multicast communication, and each information processing apparatus receiving the data transmission request autonomously transmits data to the requesting information processing apparatus.

  This method is more efficient because the number of data transmission requests can be reduced compared to the case where communication is individually performed with N information processing apparatuses. In addition, there is a feature that the transmission request processing is not changed even if the number of information processing apparatuses that perform transmission requests changes.

  Specifically, for example, it can be realized by broadcast or multicast communication using the UDP protocol in Ethernet (registered trademark) (for example, Patent Document 1).

  In addition, as a network congestion control technique, there is a method of controlling the data flow by transmitting a packet for delaying data transmission to the data transmission source. Specifically, back pressure congestion control in Ethernet (registered trademark). There is also congestion control using PAUSE frames of the MAC control protocol defined as an option of IEEE 802.3x, which transmits data transmission postponed packets according to the free capacity of the data buffer such as a switching hub. is there.

JP 2002-152213 A

  In the background art described above, consider a case where data transmission / reception is performed between an information processing device (requesting device) that requests one data and an information processing device (transmitting device) that transmits N data.

  When the requesting device transmits a data transmission request message by UDP broadcast communication, each transmitting device receives the message at approximately the same time. Here, each transmitting device operates asynchronously. However, after each transmitting device receives the message, the time required for performing the process of transmitting the data specified by the message content to the requesting device is particularly: When the software and hardware of each transmitting apparatus are the same, they are generally equal, and therefore network transmission processing is performed simultaneously after receiving the message. Here, when each transmission device is connected to the switching hub, the transmission data from each transmission device is received simultaneously by the switching hub.

  On the other hand, in recent years, communication devices such as mainstream store-and-forward switching hubs temporarily store received data in a buffer memory, but if data exceeding the buffer memory size is received, the data is discarded. In this case, the transmission data is completely lost.

  The above-described conventional technology for preventing the occurrence of such data loss (packet loss) can deal with a case where the decrease in the free space of the buffer memory size is gradual, such as when the number of ports receiving data is small, Congestion control according to the prior art is not effective for communication traffic that rapidly increases so that data is simultaneously received from a plurality of ports.

  Therefore, when the number of transmission devices N or the smaller number of ports M of the communication device such as the switching hub × the transmission data size S is larger than the buffer memory size of the communication device, data loss occurs and a communication error occurs.

  An object of the present invention is to provide a system and method for performing data transmission / reception without a communication error by suppressing occurrence of data loss regardless of the number of nodes N when performing 1-to-N communication.

  It is another object of the present invention to provide a communication control method that can be operated simultaneously with a conventional congestion control technique and a system for realizing the communication control method.

  The present invention is characterized in that the request-side information processing apparatus divides the reception-side information processing apparatus group into two or more multicast network groups, and requests data transmission in order of each multicast network group.

  Further, according to the present invention, each information processing device includes a buffer memory size of the switching hub, information and data size of the transmission side information processing device and reception side information processing device for data transmitted and received in the data communication system, and the data A storage device for storing information related to data instructing transmission of data, and when there are a plurality of receiving side information processing devices for data instructing transmission, the receiving side information processing devices are assigned to two or more multicast groups. It is characterized by transmitting data instructing data transmission in units of multicast groups.

  Further, the present invention provides a request-side information processing device when the integrated value of the number N of transmission-side information processing devices and the size of response data is equal to or smaller than the size of a memory that stores response data of the transmission-side information processing device. Transmits the request data to N transmission side information processing devices, and when the integrated value of the number N of transmission side information processing devices and the size of the response data is larger than the size of the memory, the transmission side information processing The N transmission side information processing devices are divided into groups of M units so that the integrated value of the number M of devices (M is an integer greater than or equal to 1 and smaller than N) and the size of response data is less than the size of the memory. The requesting information processing apparatus transmits the request data sequentially in units of groups.

  According to the present invention, when making a data request to a plurality of transmission devices, data is received from each transmission device with the minimum number of data requests without causing data loss due to data concentration on the network switching hub. It is possible.

  The one-to-N (N is an integer greater than or equal to 2) communication congestion control system of the present invention includes at least one information processing apparatus (hereinafter referred to as a request apparatus) connected to a network and one or more data transmissions. In the communication between information processing devices (hereinafter referred to as transmission devices), the requesting device includes network IF means for providing an interface with a network, the number of the transmission devices connected to the network, Information recording means for storing information on the data size transmitted by the transmission apparatus and the buffer memory size of the switching hub to which the communication apparatus is connected, and multicast group setting processing using the information stored in the information recording means Multicast setting processing means for performing transmission data generation processing means for generating a data transmission request message, and the data A transmission processing unit that issues a transmission instruction message to the network IF unit based on the multicast group setting, and a reception processing unit that receives the data received in the network IF and stores it in the information recording unit, The transmission device has a network IF means for providing an interface with the network, the number of the transmission devices connected to the network, the data size transmitted from the transmission device, and the switching hub to which the transmission device is connected. Information recording means for storing buffer memory size information, multicast setting processing means for performing multicast group setting processing using information stored in the information recording means, and data transmitted by the requesting device received in the network IF Obtain a transmission request message and store it in the information recording means. An existing reception processing means, a transmission data generating means for analyzing the data transmission request message and generating requested information to be transmitted, and a transmission instruction to the network IF means for transmitting the transmission data to the requesting device. Transmission processing means to perform.

  The multicast setting processing means configures one or more multicast groups such that the total size of data transmitted from each transmission device included in the multicast group does not exceed the buffer memory size of the switching hub, The transmission processing means of the requesting device holds all the configured multicast group information, and when transmitting the data transmission request message, in order with respect to each multicast group, that is, in order of each multicast group. And the reception processing means of the transmission device holds information of the multicast group including the device itself among the configured multicast groups, and receives and stores only the data transmission request message transmitted to the multicast group. , The reception data The data processing unit analyzes the data transmission request message to identify the requested data requesting device, and notifies the generated instruction and destination information of the data to the transmission data generating means. The request data generated by the transmission data generation processing unit is transmitted to the requesting device by the transmission processing unit of the transmitting device. The plurality of transmission devices preferably have the same software (application) and hardware, and perform the same data processing at the same time.

  In this way, since the data transmission request message from the requesting device is sequentially transmitted to one or more multicast groups, the transmission data from the transmitting device returned in response to one data transmission request message is sent to the multicast group. Limited to included transmission devices.

  Since the total size of the transmission data from each transmission device included in the multicast group is set to be equal to or smaller than the buffer memory size of the switching hub, even if data reception is concentrated on the switching hub, data loss is not required. .

  Further, since the data transmission request message for each multicast group is sequentially transmitted at a predetermined time interval, transmission data from the transmission device included in each multicast group is also received at the time interval. Data loss due to data concentration can also be prevented.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is a diagram showing a configuration of a data communication system according to an embodiment of the present invention.

  This data communication system includes a request device 100 that is an information processing device that makes a data request, a transmission device 200 that is an information processing device that receives a data request and transmits data, and a network switching hub 300. . Each information processing apparatus is connected to the network switching hub 300 to form a LAN (Local Area Network). A plurality (N) of information processing apparatuses 200 that perform data transmission are connected to the LAN. The configuration may include two or more requesting devices, or the same information processing device may include the functions of the requesting device and the transmitting device at the same time.

  The requesting device 100 is connected to the network switching hub 300 via a LAN, and transmits / receives data to / from the network IF (Interface) 101, setting information related to data transmission / reception, an information recording unit 102 that records received data, and the network IF 101 A reception processing unit 103 that receives the received data, checks the contents, and stores the data in a predetermined location of the information recording unit, a multicast setting processing unit 104 that sets a multicast network based on the setting information recorded in the information recording unit, A transmission data generation processing unit 105 that generates a data transmission request message, and a transmission processing unit 106 that performs processing of transmitting the data transmission request message to the set multicast network address are provided. Further, an application program 107 that can access the information recording unit 102 and the transmission data generation processing unit 105 is provided.

  The transmission apparatus 200 includes a network IF (Interface) 201 that is connected to the network switching hub 300 via a LAN and transmits / receives data, setting information related to data transmission / reception, an information recording unit 202 that records received data, and a network IF 201. Receiving processing unit 203 that receives the received data, checks the contents and saves the data in a predetermined location in the information recording unit, and multicast setting processing unit 204 that sets the multicast network based on the setting information recorded in the information recording unit A transmission data generation processing unit 205 that analyzes the received data transmission request message and generates transmission requested data, and a transmission processing unit 206 that performs processing of transmitting the transmission data to the set multicast network address, It has. Further, an application program 207 that can access the information recording unit 202 and the transmission data generation processing unit 205 is provided. The transmission devices 400, 500, 600, 700, and 800 have the same configuration as the transmission device 200.

  Here, the functions of the processing units constituting the requesting device 100 and the transmitting devices 200, 400, 600, 700, and 800 are the operating software in the information processing device such as a personal computer constituted by a memory and a CPU (Central Processing Unit). The function can be realized by loading the program for realizing each function on the operating software and executing it on the memory. Note that all or part of the above configuration may be realized by dedicated hardware.

  Next, the operation of the multicast setting processing unit of the data communication system according to the embodiment of this invention will be described.

  FIG. 2 shows setting information related to data transmission / reception recorded in the information recording units 102 and 202. The information recording units 102 and 202 include own device information 1000 including information on the device ID and IP address, which is the device identifier of the own device, switching hub information 1100 including the buffer memory size and port number information of the switching hub 300, and the device. A data ID 1201 that is an identifier of data to be transmitted / received between them, a transmitting device list 1202 that is information of a device that transmits this data, a receiving device list 1203 that is information of a device that receives this data, and transmission / reception of this data Transmission / reception data information 1200 including a use network group list 1204 which is information of a multicast network group to be used, a data size 1205 of this data, and request data information 1206 indicating that the data is transmitted as a response to designated data, Multi A network ID 1301 that is an identifier of the cast network group, a registered device list 1302 that is information of devices registered in the multicast network group, a multicast address 1303 used by the multicast network group, and a port used by the multicast network group It has network group information 1300 including used ports 1304 as information.

  Among the setting information related to the above data transmission / reception, own device information 1000, switching hub information 1100, data ID 1201, transmission device list 1202, reception device list 1203, data size 1205, network ID 1301, multicast address 1303, and used port 1304 are: Data is set in advance, and the used network group list 1204 and the registered device list 1302 are set by processing of the multicast setting processing unit 104 described below. When the network switching hub 300 stores the switching hub information 1100 in advance, and each of the requesting device 100 and the transmission devices 200,... 800 participates in the LAN, the switching hub information 1100 is received from the network switching hub 300. It may be acquired and stored. Requesting device 100 and transmitting devices 200,... 800 may have the same setting information. In this embodiment, it is assumed that the data size 1205 of the response data is uniquely determined for the request data information 1206.

  Next, the operation of the multicast setting processing unit 104 will be described with reference to FIG.

First, the multicast setting processing unit 104 acquires its own device information 1000, switching hub information 1100, transmission / reception data information 1200, and network group information 1300 from the information recording unit 102. (Step 2001)
The own apparatus ID is acquired from the own apparatus information, the transmitting apparatus list 1202 and the receiving apparatus list 1203 of the transmission / reception data information 1200 are searched, and the own apparatus transmission / reception data information 1400 that is a list of transmission / reception data in the own apparatus is generated. The own device transmission / reception data information includes a data ID 1401, a transmission / reception type 1402 indicating whether the data is transmission data or reception data for the own device, and a use network list 1403 indicating a multicast network used for transmission / reception of the data. The used network list 1403 is not set.

In the data example of FIG. 2, since the own device ID is S, the own device transmission / reception data information 1400 is set with the data ID “D001” from the transmission device list by the transmission / reception type “send”, and from the reception device list, the data IDs “D002”, “D003”, “D004”, “D005”, “D006”, and “D007” are set in the transmission / reception type “receive”. (Step 2002)
Subsequently, a process for setting a multicast network group to be used for each data set in the transmission / reception data information 1200 is entered.

First, the number N of receiving devices for processing target data is calculated (step 2003), and parameters i and j used for processing are initialized to 1. (Step 2004)
In the setting data shown in FIG. 2, when the data ID “D001” is taken as an example, six devices A, B, C, D, E, and F are registered in the receiving device list. = 6.

Next, the transmission / reception data information 1200 is searched, the transmission data of the i-th device in the reception device list of “D001”, and the transmission device of “D001” in the reception device list 1203 (in this example, the device ID is S) And “D001” is included in the request data information 1206, the data size 1205 is acquired as the i-th response data size. If such transmission data does not exist, the response data size is set to zero. This process is repeated from the i-th to the j-th, and it is determined whether or not the result of calculating the total of each response data size is larger than the buffer size included in the switching hub information. (Step 2005)
If the determination result in step 2005 is YES, i and j at that time are compared to determine whether they are equal. If the result is YES, the process proceeds to step 2009. If the result is NO, the process proceeds to 2011. (Step 2006)
If the determination result in step 2005 is NO, j is incremented by 1 (step 2007), and it is determined whether j does not exceed the number N of receiving devices. (Step 2008)
If the determination result in step 2008 is YES, the process proceeds to step 2011; if NO, the process proceeds to step 2005.

In step 2009, the i-th receiving device is set as a new multicast group, the set multicast network ID is set in the used network group list 1204 corresponding to the data ID of the transmission / reception data information 1200, and the process proceeds to step 2010. (Step 2009)
In step 2010, i = j + 1 and j = j + 1 are set, and the process proceeds to step 2013. (Step 2010)
In step 2011, the i-th to (j-1) th receiving devices are set as a new multicast group, the set multicast network ID is set in the used network group list 1204 corresponding to the data ID of the transmission / reception data information 1200, and step 2012 is set. Transition to. (Step 2011)
In step 2012, i = j and j = j, and the process proceeds to step 2013.

In step 2013, it is determined whether i and j do not exceed the number N of receiving devices. (Step 2012)
If the determination result in step 2013 is YES, the process proceeds to step 2014; if NO, the process proceeds to step 2005.

In step 2014, with reference to the own device transmission / reception data information created in step 2002, if processing has already been completed for all transmission / reception data, the process proceeds to step 2016. If there is unprocessed transmission / reception data, step 2015 is performed. (Step 2014), the next transmission / reception data information is acquired, and the processing transitions to step 2003. (Step 2015)
In step 2016, for each data of the own device transmission / reception data information 1400, the content of the used network group list 1204 of the corresponding data of the transmission / reception data information 1200 is copied to the used network group list 1403, and then the own device received data information is transmitted. To the reception processing unit and the processing ends. (Step 2016)
Next, the multicast group setting process in steps 2009 and 2011 will be described in detail with reference to FIG.
First, a device list to be registered in the multicast network is acquired. (Step 3001)
The registered device list 1302 of the network group information 1300 is searched to search for a device that matches the device list. If there is a device that matches the device list, the process proceeds to step 3004. Otherwise, the process proceeds to step 3004. (Step 3002)
If there is a network group that matches the device list, the corresponding network ID 1301 is set in the used network group list 1204 corresponding to the target data ID of the transmission / reception data information 1200. (Step 3003)
If there is no network group that matches the device list, the device list is set to a network group in which the device list 1302 is not registered, and the process proceeds to Step 3005. (Step 3004)
The network ID 1301 of the network group set in step 3004 is set in the used network group list 1204 corresponding to the target data ID of the transmission / reception data information 1200. (Step 3005)
Through the processing described above, one multicast network group can be set for each receiving device list.

  When the multicast setting process described above is performed on the setting data of FIG. 2, the network group information 1300 includes the network ID “G001” that is the registered device list A, B, and C, and the registered device lists D and E. , F is set as three multicast networks of network ID “G002” and registered device list S as network ID “G003”.

In the used network group list 1204 of the transmission / reception data information 1200, a plurality of network groups G001 and G002 are set in the data ID “D001”, and a network group G003 is set in the data IDs “D002” to “D007”.
Also, the own device transmission / reception data information of the device having the device ID S is set as 1400, and the next device double tree data information of the device with the device ID A is set as 1400A.
Next, the processing of the transmission processing units 106 and 206 will be described with reference to FIG.

The transmission processing units 106 and 206 receive the own device transmission / reception data information 1400 from the multicast setting processing units 104 and 204. (Step 4001)
After that, it waits for a data transmission request message including transmission data and transmission data ID from the transmission data creation processing units 105 and 205. If there is a transmission instruction, the process proceeds to step 4003. (Step 4002)
The transmission data ID for which transmission has been instructed is searched in the self-device transmission / reception data information 1400. The used network group list 1403 corresponding to the data ID is acquired. (Step 4003)
The transmission data instructed to be transmitted is sequentially transmitted to the network groups included in the used network group list acquired in step 4003 at a predetermined time interval, and the processing shifts to a data transmission instruction waiting in step 4002. (Step 4004) The predetermined time interval is, for example, 10 ms or 100 ms. Regardless of the number of receiving devices N, the response data size, and the buffer size, the predetermined time interval may be constant, or the larger the number of receiving devices N, the larger the response data size, or the smaller the buffer size, the predetermined time interval. The interval may be increased. The predetermined time interval is realized by setting a clock cycle for controlling transmission timing.

  In the own device transmission / reception data information 1400 of FIG. 2, for example, when the device S transmits data D001, data transmission processing is performed for each of the network groups G001 and G002. Specifically, in the case of G001, data is transmitted to the transmission destination address “239.255.0.1” and the port number “10001”. However, the network group of G001 includes devices A, B, and C. Is registered, data is transmitted to the three devices.

  Next, processing of the reception processing units 103 and 203 will be described with reference to FIG.

The transmission processing units 103 and 203 receive the own device transmission / reception data information 1400 from the multicast setting processing units 104 and 204. (Step 5001)
The used network group list 1403 is acquired for all the data of the transmission / reception data information 1400 of the own device whose transmission / reception type 1402 is “receive”.

In the own device transmission / reception data information 1400, data D002 to D007 are reception data, and the use network group list is G003. In the own device transmission / reception data information 1400A, data D001 is reception data, and the use network group list is Becomes G001 and G002. (Step 5002)
In order to receive data from the used network group acquired in step 5002, the device registers itself in the used network group. Specifically, an API for setting the own device to receive the multicast address is called to the switching hub. (Step 5003)
Thereafter, it waits for data reception of the network IFs 101 and 201. If there is data reception, the process proceeds to step 5005. (Step 5004)
When the data ID included in the received data is acquired and the data transmission / reception type of the data ID is “received” with reference to the own device transmission / reception data information 1400, the data ID of the information recording unit 102 or 202 is predetermined. Record the received data at the specified position (address). (Step 5005)
As described above, with respect to data in which the transmission / reception type of the local device transmission / reception data information 1400 is designated as “receive”, data reception is possible by registering the local device in the used network group.

  When the “data ID” and “data” are given from the application program 107 operating on the requesting device 100, the transmission data generation processing unit 105 of the requesting device 100 retrieves the data ID from the own device transmission / reception data information, When the transmission / reception type is “send”, a data transmission request message including the data and the data ID is sent to the transmission processing unit 106.

  When the “data ID” and “data” are given from the application program 207 operating on the transmission device 200, the transmission data generation processing unit 205 of the transmission device 200 searches the data transmission / reception data information for the data ID and transmits / receives the data ID. When the type is “Send”, a data transmission request message including the data and the data ID is sent to the transmission processing unit 206.

  The application program 107 operating on the requesting device can send a transmission request message to the transmission data generation processing unit 105 or can acquire received data by referring to the information recording unit 102.

  The application program 207 operating on the transmission device can send a transmission request message to the transmission data generation processing unit 205 or can acquire received data by referring to the information recording unit 202. Further, the data newly received and recorded in the information recording unit 202 is monitored, and the data ID of the received data is present in the request data information 1206 of the transmission / reception data information 1200 and is included in the transmission device list 1202 of the data. When the own device is included, the data is generated and a transmission request message is transmitted to the transmission data generation processing unit 205.

  As described above, in this embodiment, when the AP 107 of the requesting device 100 makes a data request to the transmitting devices 200, 300, 400, 500, 600, 700, 800, the transmitting devices 200, 300, 400 and the transmission devices 500, 600, and 700 perform data requests in two steps, so that the response data for each data request is less than the buffer size of the switching hub.

In addition, a data transmission request can be made a smaller number of times compared to a case where a data request is made for each transmission device.
Note that the multicast network group setting method is not limited to the method shown in FIG. 3, and is a method that satisfies the condition that the total transmission data size of the transmission device allocated to the multicast network does not exceed the buffer memory size of the switching hub. If it is.

  For example, when the transmission data size Sx of each transmission apparatus is the same, a method as shown in FIG. 7 may be used. The process of FIG. 7 will be described below.

First, device information 1000, switching hub information 1100, transmission / reception data information 1200, and network group information 1300 are acquired from the information recording unit 102. (Step 6001)
The own apparatus ID is acquired from the own apparatus information, the transmitting apparatus list 1202 and the receiving apparatus list 1203 of the transmission / reception data information 1200 are searched, and the own apparatus transmission / reception data information 1400 that is a list of transmission / reception data in the own apparatus is generated. The own device transmission / reception data information includes a data ID 1401, a transmission / reception type 1402 indicating whether the data is transmission data or reception data for the own device, and a use network list 1403 indicating a multicast network used for transmission / reception of the data. The used network list 1403 is not set. (Step 6002)
Subsequently, a process for setting a multicast network group to be used for each data set in the transmission / reception data information 1200 is entered.

First, the number N of receiving devices of processing target data is calculated, the response data size Sx common to each device is acquired (step 6003), and the division number parameter Div used for processing is initialized to 1. (Step 6004)
In the example of FIG. 2, N = 6 and Sx = 3000.

Next, it is determined whether or not a value S obtained by multiplying the number obtained by dividing N by the division number Div (rounded up) by the response data size Sx is larger than the buffer size included in the switching hub information. If the determination result is YES, the value of Div at that time is incremented (step 6006) and the process proceeds to step 6005, and if NO, the process proceeds to 6007. (Step 6005)
In the example of FIG. 2, when Div = 1, S is 3000 × 6 = 18000 with respect to the buffer size of 10000, and when Div = 2, S is 3000 × (6/2) = 9000, and Div = 2 and step 6007 is performed. Transition.
In step 6007, a multicast group is set for each number obtained by dividing N by Div (rounded up). In the example of FIG. 2, since N = 6 and Div = 2, a multicast group is set for every three devices. When transmission / reception data information 1200 is selected in this order, A, B, C and D, E, F are registered in the multicast group. The multicast setting process is the same as already described with reference to FIG.

Further, step 6008 is the same as step 2014, and the transition destination is step 6009 instead of step 2015 and step 6010 instead of step 2015.
Step 6009 is the same as step 2015 and the transition destination is step 6003.
Step 6010 is the same as Step 2016.

  The present invention is applicable to a multicast communication device.

System configuration diagram of an embodiment of the present invention The figure which shows the setting information regarding the data transmission / reception recorded on the information recording parts 102 and 202 of the Example of this invention. The figure which shows the processing flow of the multicast setting process part of the Example of this invention. The figure which shows the processing flow of the multicast group setting process of the Example of this invention. The figure which shows the processing flow of the transmission process part of the Example of this invention. The figure which shows the processing flow of the reception process part of the Example of this invention. The figure which shows another processing flow of the multicast setting process part of the Example of this invention.

Explanation of symbols

100 request apparatus 200, 300, 400, 500, 600 transmission apparatus 300 network switching hub 1000 own apparatus information 1100 switching hub information 1200 transmission / reception data information 1300 network group information 1400 own apparatus transmission / reception data information 1400A apparatus A own transmission / reception Data information

Claims (11)

Data comprising an information processing device group including at least two or more transmission-side information processing devices connected to each other via a switching hub, and a request-side information processing device that requests data transmission to the information processing device group In a communication system,
The request information processing apparatus divides the information processing apparatus group into two or more multicast network groups, and requests data transmission in order of the multicast network group. The data communication system according to claim 1, wherein
A data communication system, characterized in that a total of data sizes transmitted by transmission side information processing devices included in the multicast network group is equal to or smaller than a buffer memory size of the switching hub. In a data communication system comprising an information processing device group including at least two or more information processing devices connected to each other via a switching hub, and an information processing device that requests data transmission to the information processing device group,
Each information processing device
A memory for storing the buffer memory size of the switching hub, information and data sizes of the transmission side information processing device and the reception side information processing device for data transmitted and received in the data communication system, and information relating to data instructing transmission of the data Equipment,
When there are a plurality of receiving information processing devices for data instructing transmission, a setting processing unit that assigns the receiving information processing devices to two or more multicast groups;
A data communication system comprising: a transmission processing unit that transmits data instructing transmission of the data in units of the two or more multicast groups. The data communication system according to claim 3, wherein
The setting processing unit allocates the reception side information processing device in units of the multicast group so that a total size of transmission data of the reception side information processing device is smaller than a buffer memory size of the switching hub. Data communication system. A data communication system that includes a plurality of information processing devices that can communicate with each other via a network, and that N (N is an integer of 2 or more) transmission side information processing devices respond to requests from the request side information processing devices In
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is equal to or smaller than the size of the memory storing the response data of the transmission side information processing device, the request side information processing device Send request data to N sending side information processing devices,
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is larger than the size of the memory, the number M of transmission side information processing devices (M is an integer that is 1 or more and smaller than N) ) And the response data size is equal to or smaller than the size of the memory, the N transmission side information processing devices are divided into groups of M units, and the request side information processing device A data communication system, wherein the request data is transmitted sequentially in units. The data communication system according to claim 5, wherein
The data communication system, wherein the memory is a buffer memory in a switching hub that relays communication between the plurality of information processing apparatuses. The data communication system according to claim 5 or 6,
The request side information processing apparatus transmits the request data to the N transmission side information processing apparatuses by multicast communication. The data communication system according to any one of claims 5 to 7,
The request side information processing apparatus includes means for determining whether an integrated value of the number N of the transmission side information processing apparatuses and the size of the response data is equal to or smaller than the size of the memory. Data communication system. The data communication system according to claim 8,
Each of the request side information processing device and the N transmission side information processing devices includes a size of the memory and a list of a transmission side information processing device and a reception side information processing device for each data transmitted and received in the data communication system. And a storage device for storing the size of each data transmitted / received in the data communication system and the ID of request data for requesting each data transmitted / received in the data communication system,
The determining means of the requesting information processing device refers to the list of the transmitting information processing device and the receiving information processing device in the storage device, and the own device is included in the list of the transmitting information processing device. And when there are N receiving side information processing devices included in the list of receiving side information processing devices, the size of the memory in the storage device and the size of the data are referred to, and the transmitting side A data communication system characterized by determining whether an integrated value of the number N of information processing devices and the size of the response data is equal to or smaller than the size of the memory. A data communication system that includes a plurality of information processing devices that can communicate with each other via a network, and that N (N is an integer of 2 or more) transmission side information processing devices respond to requests from the request side information processing devices In the data communication method executed by
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is equal to or smaller than the size of the memory storing the response data of the transmission side information processing device, the request side information processing device Send request data to N sending side information processing devices,
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is larger than the size of the memory, the number M of transmission side information processing devices (M is an integer that is 1 or more and smaller than N) ) And the response data size is equal to or smaller than the size of the memory, the N transmission side information processing devices are divided into groups of M units, and the request side information processing device A data communication method, wherein the request data is transmitted sequentially in units. A data communication system that includes a plurality of information processing devices that can communicate with each other via a network, and that N (N is an integer of 2 or more) transmission side information processing devices respond to requests from the request side information processing devices In the information processing apparatus in
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is equal to or smaller than the size of the memory storing the response data of the transmission side information processing device, the N transmission side information processing devices Send request data to the device,
When the integrated value of the number N of the transmission side information processing devices and the size of the response data is larger than the size of the memory, the number M of transmission side information processing devices (M is an integer that is 1 or more and smaller than N) ) And the response data size is equal to or smaller than the size of the memory, the N transmission side information processing devices are divided into groups of M units, and the request data An information processing apparatus characterized by transmitting

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