JP2018085638A - Communication device, communication system, communication method, and communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain elongation of communication time including data conversion time when reception is temporarily disabled due to a reason for device flow control at a reception side in communication between devices employing different data formats.SOLUTION: A communication device includes: data conversion means for converting data into a data format of another communication device; and data communication means for transmitting, to another communication device, a) next data if receivable notice based on flow control is received from another communication device after transmitting the data to another communication device, or b) next data converted by the data conversion means when the receivable notice is not received.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication device, a communication system, a communication method, and a communication program, and more particularly to communication between communication devices having different data formats.

  Patent Document 1 discloses a computer in which a transmission-side computer converts transmission data according to an endian of a reception-side computer in a one-to-one communication in a communication system using a plurality of computers in which endian formats are mixed.

  Patent Document 2 compares transmission data conversion capabilities of a receiving side and a transmission side in a communication system in which endian formats are mixed, and transmission data conversion in which a device having a higher conversion capability converts transmission data in accordance with the endian of the counterpart device. An apparatus is disclosed.

  Patent Document 3 discloses a terminal that determines an endian format to be used for broadcast communication according to the weight of each terminal in the broadcast communication group in a network system in which endian formats are mixed. This weight is each terminal processor performance value (MIPS value) (Million Instruction Per Second) or the like, and this terminal uses the endian format of the low weight terminal in the broadcast group for broadcast communication.

JP-A-10-327210 JP 2000-276424 A JP-A-11-328049

  As disclosed in Patent Document 1, when the transmission data is converted in accordance with the endian format of the reception-side device at the transmission-side device, the problem described below occurs.

  FIG. 8 is a diagram illustrating an example in which the node 1 transmits communication data to the nodes 2, 3 and 4 in the distributed parallel system.

  FIG. 9 is a diagram showing details of communication data transmitted and received in the distributed parallel system of FIG. The node 1 transmits the communication data for the node 2 in FIG. 9 to the node 2, b) transmits the communication data for the node 3 in FIG. 9 to the node 3, and so on. Send another communication data to

  When data conversion is performed only in the node 1 on the transmission side in the distributed parallel system of FIG. 8 (a in FIG. 8), the node 1 performs data conversion of communication data to the node 2 and then proceeds to the node 2. Implement data transfer. Next, the node 1 performs data transfer of the communication data to the node 3 and then performs data transfer to the node 3.

  In this way, the node 1 alternately repeats the data conversion (the black portion in FIG. 8a) and the data communication (the white portion in FIG. 8a) from the node 2 to the node 4. In this case, a communication waiting time (hatched portion of FIG. 8A) occurs from the node 2 to the node 4 on the receiving side.

  As a result, when data conversion is performed on the transmission side, data communication time including data conversion, data transfer, and waiting time becomes long.

  On the other hand, when the node 2 to the node 4 on the receiving side perform data conversion, the node 1 performs only data communication (b in FIG. 8). Each of the node 2 to the node 4 on the receiving side performs data conversion (blacked portion in FIG. 8B).

  Since node 1 only performs data transfer, there is almost no communication waiting between nodes 2 to 4 on the receiving side, and data conversion of each node can be performed in parallel.

  As a result, the data communication time including data conversion and data transfer when data conversion is performed on the reception side is shorter than that when data conversion is performed on the transmission side (arrow c in FIG. 8). .

  Therefore, it is advantageous to perform the data conversion at the receiving side, but it may occur otherwise. The following is an explanation of this problem.

  FIG. 10 shows an example of one-to-one communication from the node 1 on the transmission side to the node 2 on the reception side. In the case of one-to-one communication, in an ideal pattern (FIG. 10a)), the data communication time is the data transfer time (FIG. 10a) and the time required for data conversion (FIG. 10a) blackened portion. ) Total time.

  However, if the node 2 on the receiving side is temporarily unable to receive due to flow control reasons such as the communication buffer being full (black arrow in FIG. 10B), the node 1 on the transmitting side waits for data transmission (FIG. 10). 10b) hatched portion).

  In such a case, if the node 2 on the receiving side performs data conversion (the black portion in FIG. 10b), the data communication time increases (FIG. 10c)). The data communication time is the time taken for the data transfer time (the white area in FIG. 10b) and the data conversion (the black area in FIG. 10b) plus the communication waiting time (the hatched area in FIG. 10b). Because it becomes.

  The present invention solves the above-described problem, and communication time including data conversion time when a terminal device on the receiving side becomes temporarily unreceivable for reasons of flow control in communication between devices having different data formats. An object of the present invention is to provide a communication device that can suppress the lengthening of the communication.

  A communication apparatus according to an embodiment of the present invention includes a data conversion unit that converts data into a data format of another communication apparatus, and after the data is transmitted to the other communication apparatus, from the other communication apparatus, a) Data communication means for transmitting the next data to the other communication device when receiving the reception enable notification based on flow control; b) transmitting the next data converted by the data conversion means if the reception enable notification is not received; .

  In the communication method according to the embodiment of the present invention, after data is transmitted to the communication device, a) a receivable notification based on flow control is received from the communication device, and b) the receivable notification is received. Otherwise, the data is converted into the data format of the communication device, and the converted next data is transmitted to the communication device.

  A communication program according to an embodiment of the present invention includes: a data conversion process for converting data into a data format of a communication device serving as a communication partner; and after transmitting data to the communication device, a) flow from the communication device A data communication process for transmitting to the communication device, the next data when receiving a receivable notification based on control, and b) transmitting the next data converted by the data conversion process when not receiving the receivable notification to the computer. Let it run.

  The communication device according to the present invention has a communication time including a data conversion time when the communication device on the receiving side becomes temporarily unable to receive for communication reasons between devices of different data formats. Prolongation can be suppressed.

FIG. 1 is a configuration diagram of a communication system 300 according to the first embodiment of the present invention. FIG. 2 is a configuration diagram of the data format information 131 stored in the data format storage unit 130. FIG. 3 is a configuration diagram of the communication data 111. FIG. 4 is a flowchart showing an operation of transmission processing in the communication apparatus 100. FIG. 5 is a flowchart showing an operation of reception processing in the communication apparatus 100. FIG. 6 is a configuration diagram of the computer apparatus 600. FIG. 7 is a configuration diagram of the communication apparatus 100 according to the second embodiment of the present invention. FIG. 8 is a diagram illustrating an example in which the node 1 transmits communication data to the nodes 2, 3 and 4 in the distributed parallel system. FIG. 9 is a diagram showing details of communication data transmitted and received in the distributed parallel system of FIG. FIG. 10 shows an example of one-to-one communication from the node 1 on the transmission side to the node 2 on the reception side.

<First Embodiment>
<Configuration>
Next, the configuration of the first exemplary embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of a communication system 300 according to the first embodiment of the present invention.

  The communication system 300 includes a plurality of communication devices 100 connected to a network 240. In the communication system 300, the data formats of the plurality of communication devices 100 are not unified. That is, communication apparatuses 100 having different data formats are mixed in the communication system 300.

  Here, the data format is, for example, an endian format or a character code system. The endian format is big endian or little endian.

  Each communication device 100 includes a data format collection unit 120, a data format storage unit 130, a data conversion determination unit 140, a data conversion unit 150, and a data communication unit 160.

  The data format collection unit 120 collects data formats of other communication devices 100 existing in the communication system 300, creates data format information 131 described later, and stores the data format information 131 in the data format storage unit 130.

  The data conversion determination unit 140 determines whether or not the data format conversion of the communication data 111 is necessary for communication with the designated communication device 100. The data conversion determination unit 140 makes this determination by referring to the data format information 131 and determining whether or not the data formats of both communication apparatuses 100 match. If they match, data format conversion is not necessary.

  The data conversion unit 150 performs data format conversion of the input communication data 111. The data communication unit 160 transmits / receives the communication data 111 to / from the other communication device 100.

  The data format conversion of the communication data 111 may be performed at the time of transmission or at the time of reception. When it is performed at the time of transmission, the data conversion unit 150 receives the communication data 111 from the process 110 that executes business processing in the communication apparatus 100, converts the data format, and outputs the data to the data communication unit 160. When it is performed at the time of reception, the data conversion unit 150 receives the communication data 111 from the data communication unit 160, converts the data format, and outputs it to the process 110.

  Each communication device 100 is given a unique identifier within the communication system 300. The identifier is, for example, node 1, node 2... Node N (N is the number of communication devices 100 in the communication system 300).

  FIG. 2 is a configuration diagram of the data format information 131 stored in the data format storage unit 130. The data format information 131 stores the data format of the communication device 100 in association with the identifier of the communication device 100. In the example of FIG. 2, the data format is L (little endian) or B (big endian).

  The data format collection unit 120 collects the data format of each communication device 100 as an execution environment from the process 110 in the other communication device 100 that executes the distributed parallel program, and creates data format information 131.

  FIG. 3 is a configuration diagram of the communication data 111. The communication data 111 has a payload 114 that is the contents of the data and header information 112. The header information 112 has a data conversion bit 113 indicating whether or not the data conversion of the payload 114 has been performed. Note that converting the data format of the payload 114 may refer to converting the data format of the communication data 111.

  Here, the data format collection unit 120, the data conversion determination unit 140, the data conversion unit 150, and the data communication unit 160 of the communication device 100 are configured by logic circuits. The data format storage unit 130 is a storage device such as a disk device or a semiconductor storage device.

  The communication device 100 may be realized by the computer device 600. FIG. 6 is a configuration diagram of the computer apparatus 600. The computer device 600 includes a processor 610, a main storage unit 630, and an external storage device 620 that are connected to each other via a bus 640. The processor 610 reads / writes data from / to the main storage unit 630 and the external storage device 620 via the bus 640. Further, the processor 610 executes a program 650 stored in the main storage unit 630. Note that the program 650 is initially stored in the external storage device 620, and the processor 610 may load the external storage device 620 from the external storage device 620 to the main storage unit 630 when the computer device 600 is initially set.

  Here, the main storage unit 630 is a semiconductor memory device. The external storage device 620 is a storage device such as a disk device or a semiconductor storage device.

  The processor 610 functions as the data format collection unit 120, the data conversion determination unit 140, the data conversion unit 150, and the data communication unit 160 by executing the program 650. That is, the processor 610 executes the program 650 to execute processing performed by the data format collection unit 120, the data conversion determination unit 140, the data conversion unit 150, and the data communication unit 160.

  The main storage unit 630 or the external storage device 620 may be used as the data format storage unit 130.

<Operation>
The operation of the communication device 100 will be described in detail with reference to the drawings. FIG. 4 is a flowchart showing an operation of transmission processing in the communication apparatus 100.

  First, the data conversion determination unit 140 refers to the data format information 131 and checks whether the data format of the transmitting apparatus 100 and the receiving communication apparatus 100 is the same (step 410). If the data formats are the same (Y in step 410), the data communication unit 160 transmits the communication data 111 without converting the data format (step 460).

  If the data formats are different (N in Step 410), the data conversion determination unit 140 outputs the data format of the communication device 100 on the receiving side.

  Next, the data communication unit 160 proceeds to check of Ack (receivable) notification in the flow control of the data communication unit 160 of the reception side communication device 100 (step 420). For example, the data communication unit 160 performs flow control using a sliding window. In the flow control by the sliding window, the data communication unit 160 transmits the communication data 111, and then receives the Ack notification from the receiving side, and then transmits the next communication data 111. Even if the Ack signal is not received even after a predetermined time has elapsed after transmitting the communication data 111, the data communication unit 160 continues to send the communication data 111 up to the number determined by the window.

  If the data formats are different (N in Step 410), the data communication unit 160 checks whether or not Ack has been received within a predetermined time after transmission of the communication data 111, and if received (Y in Step 420), The next communication data 111 is transmitted without converting the data format (step 460).

  If Ack is not received within a predetermined time after transmission of the communication data 111 (N in Step 420), the data conversion unit 150 converts the next communication data 111 into the data format of the receiving-side communication device 100, and converts the data conversion bit. 113 is turned on (steps 440 and 450). The data conversion unit 150 determines the data format of the receiving communication device 100 from the output value of the data conversion determination unit 140.

  Finally, the data communication unit 160 transmits the next communication data 111 converted into the data format on the reception side to the reception side communication device 100 (step 460).

  Even if the Ack is not received within a predetermined time after the transmission of the communication data 111 (N in Step 420), in the case of one-to-many communication (Y in Step 430), the data communication unit 160 determines that the next communication data 111 is transmitted without converting the data format (step 460).

  FIG. 5 is a flowchart showing an operation of reception processing in the communication apparatus 100. In the communication device 100 on the receiving side, if the data conversion bit 113 of the received communication data 111 is not on (N in Step 510), the data conversion unit 150 converts the communication data 111 into the data format of the own device (Step 520). The converted communication data 111 is passed to the process 110.

  If the data conversion bit 113 of the received communication data 111 is on (Y in step 510), the data communication unit 160 outputs the received communication data 111 to the process 110 without performing data conversion. This is because if the data conversion bit 113 is ON (Y in Step 510), the communication data 111 has already been converted into the data format of the own device by the communication device 100 on the transmission side.

<Effect>
The communication device 100 according to the present embodiment has a data conversion time when the communication device 100 on the receiving side temporarily becomes unable to receive for communication reasons between the communication devices 100 having different data formats. It is possible to suppress the lengthening of communication time including

  The reason is that if the flow control receivable notification is not received, the data conversion unit 150 converts the next communication data 111 into the data format on the receiving side, and the data communication unit 160 converts the next communication data 111 after conversion. It is because it transmits.

  That is, in the case as shown in FIG. 10 b), the transmission side performs data conversion during the communication waiting time, thereby shortening the communication time including the data conversion as a whole (FIG. 10 c)).

<Second Embodiment>
FIG. 7 is a configuration diagram of the communication apparatus 100 according to the second embodiment of the present invention.

  The communication device 100 includes a data conversion unit 150 and a data communication unit 160. The data conversion unit 150 converts the data into the data format of the other communication device 100.

  After transmitting data to another communication device 100, the data communication unit 160 receives next reception notification based on flow control from the other communication device 100, and then transmits the next data to the other communication device 100. On the other hand, if the data communication unit 160 does not receive the reception enable notification, the data communication unit 160 transmits the next data converted by the data conversion unit 150 to the other communication device 100.

  Such a communication device 100 is effective, for example, when it is known in advance that the data format of the communication device 100 of the transmission partner is different from that of the own device. In such a case, the data format collection unit 120 and the data conversion determination unit 140 are not necessary.

  The communication device 100 according to the present embodiment has a data conversion time when the communication device 100 on the receiving side temporarily becomes unable to receive for communication reasons between the communication devices 100 having different data formats. It is possible to suppress the lengthening of communication time including

  The reason is that if the flow control receivable notification is not received, the data conversion unit 150 converts the next data into the data format on the receiving side, and the data communication unit 160 transmits the converted next data. is there.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Communication apparatus 110 Process 111 Communication data 112 Header information 113 Data conversion bit 114 Payload 120 Data format collection part 130 Data format memory | storage part 131 Data format information 140 Data conversion judgment part 150 Data conversion part 160 Data communication part 240 Network 300 Communication system 600 Computer device 610 Processor 620 External storage device 630 Main storage unit 640 Bus 650 Program

Claims (10)

Data conversion means for converting data into the data format of another communication device;
After the data is transmitted to the other communication device, a) the next data is received from the other communication device upon receipt of the flow control notification, and b) the data conversion means when the reception notification is not received. A data communication means for transmitting the next data converted by the communication device to the other communication device. Data format storage means for storing the data format of the other communication device;
Refer to the data format storage means, determine whether the data format of its own device and the other communication device match, if not, data conversion determination means to output the data format of the other communication device; Further comprising
The data conversion means converts the next data into the data format output by the data conversion determination means,
The data communication means transmits the next data converted by the data conversion means when it does not receive the receivability notification and the data conversion determination means determines that the data format does not match. Item 1. The communication device according to Item 1.   The communication apparatus according to claim 2, further comprising a data format collection unit that acquires data format information from the other communication apparatus and stores the data format information in the data format storage unit. The other communication device having a different data format from the communication device;
A communication system including the communication device according to claim 1.   After the data is transmitted to the communication device, a) the next data is received from the communication device when receiving a receivable notification based on flow control, and b) the data is converted into the data format of the communication device when the receivable notification is not received. A data communication method for transmitting the converted next data to the communication device. Pre-store the data format of the communication device;
Referring to the stored data format, determine whether the data format of the communication device and the device that executed the data communication method match, and if not match, output the data format of the communication device,
6. The communication method according to claim 5, wherein when the reception enable notification is not received and the data format does not match, the next data is converted into the output data format, and the converted next data is transmitted.   The communication method according to claim 6, wherein the data format is acquired from the communication device and stored in advance. A data conversion process for converting data into a data format of a communication device as a communication partner;
After the data is transmitted to the communication device, a) the next data is received when the communication device receives a receivable notification based on the flow control, and b) the data converted by the data conversion process when the receivable notification is not received. A communication program for causing a computer to execute data communication processing for transmitting next data to the communication device A data format storage process for storing in advance the data format of the communication device;
A computer for referring to the stored data format to determine whether the data format of the device and the communication device match, and to output the data format of the communication device if they do not match; To run
In the data conversion process, the next data is converted into the data format output in the data conversion determination process,
The computer is configured to execute a process of transmitting the next data converted by the data conversion process when the data communication process does not receive the receivability notification and determines that the data format does not match. 8 communication programs.   The communication program of Claim 9 which makes a computer perform the data format collection process which acquires and memorize | stores data format information from the said communication apparatus.

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