Abstract: This communication system comprises a plurality of computers 1, 2 that each comprise: an optical transport path control unit 14 that adjusts the number of optical transport paths between the computer itself and a connection target computer and that sets the adjusted number of optical transport paths; a remote direct memory access (RDMA) communication unit 11 that, in accordance with the number of optical transport paths 4 announced from the optical transport path control unit 14, chunks data that is to be transferred to the connection target computer; and an RDMA control unit 16 that sets RDMA communication paths the number of which is the same as the number of the optical transport paths 4 pursuant to an instruction from the RDMA communication unit 11.

Abstract: The communication apparatus includes: a processing device that processes communication data to be transmitted to and received from a partner apparatus; a transmission unit that transmits the communication data to the partner apparatus; an internal state measurement unit that measures a state related to transmission of the communication data between the processing device and the transmission unit and a determination unit that determines a communication mode in communication with the partner apparatus from the state. The transmission unit transmits the communication data to the partner apparatus in the determined communication mode.

Abstract: A data transfer system includes: a transmission side data transfer device that transmits a plurality of pieces of data generated by a data generator; and a reception-side data transfer device that transmits a bundle of the pieces of data to a remote computer, the transmission-side data transfer device includes: a distribution unit that distributes the plurality of pieces of data to distribution destinations having priorities of the respective pieces of data; a generation unit that consolidates a plurality of pieces of data respectively distributed to the distribution destinations into each chunk having a size greater than or equal to a certain size, in order from one of the distribution destinations having a high priority; and a transmission unit that transmits each of the chunks to the reception-side data transfer device, and the reception-side data transfer device includes a determination unit that determines the priorities of the pieces of data.

Abstract: A local terminal transmits to a processing device an RDMA transmission packet in which processing data to be transferred to a memory of an accelerator of each of a first remote terminal and a second remote terminal is set. The processing device acquires a QPN from the first remote terminal, converts a Destination QP of a BTH of the RDMA transmission packet into the QPN acquired from the first remote terminal, and transmits a converted RDMA transmission packet to the first remote terminal. When a connection is established, the processing device acquires a QPN from the second remote terminal, converts the Destination QP of the BTH of the RDMA transmission packet into the QPN acquired from the second remote terminal, and transmits a converted RDMA transmission packet to the second remote terminal. Each of the first and second remote terminal transfers the processing data to the memory of the accelerator.

Abstract: A communication system includes a plurality of computing machines 1 and 2 connected to an optical network, in which the optical network includes a main signal communication path 4 and a control communication path 3. Each of the computing machines 1 and 2 includes a control unit 14 that sets a remote direct memory access (RDMA) communication path, and a communication unit 11 that transmits a setting request including setting information of the RDMA communication path set by the control unit 14 and setting information for setting the main signal communication path 4 to a computing machine of an access destination via the control communication path 3; and a main signal transmitting/receiving unit 16 that establishes the main signal communication path 4 based on the setting information of the main signal communication path 4.

Abstract: A communication system includes a first intermediate device 10A and a second intermediate device 10B, in which the first intermediate device includes a buffer management unit 15 that determines a buffer size based on delay information and secures a buffer, a transfer unit 11 that, when data to be transferred to a second device 50 is smaller than a credit of the second intermediate device, transfers a request including the data to the second intermediate device, and a generation unit 12A that generates a pseudo-response to the request and returns the pseudo-response to the first device, and the second intermediate device includes a buffer management unit 15 that determines a buffer size based on the delay information and secures a buffer, a transfer unit 11 that transfers the request to the second device and stores the request in the buffer to update the credit of its own device, and a discarding unit 12B that discards a response received from the second device, deletes the request stored in the buffer, and up

Abstract: An intermediate device 10A is the intermediate device 10A disposed between a requester 30 for transferring data using RDMA and a responder 50. The intermediate device 10A extracts a combination of a QPN of the requester 30 and the QPN of the responder 50 from a packet transmitted and received when establishing the connection, and registers the combination in a QPN table 15. The intermediate device 10A manages an MSN by a WQ table 17, and transitions the MSN number when receiving a request with a flag of Last or Only from the requester 30, and returns a pseudo-Response including the MSN after the transition.

Abstract: A communication system includes a plurality of computing machines connected to an optical network, in which the optical network includes a main signal communication path and a control communication path. Each of the computing machines and includes an RDMA communication unit that performs transmission of setting information for setting the main signal communication path to a computing machine of an access destination via the control communication path; and a main signal transmitting/receiving unit that establishes the main signal communication path based on the setting information. The RDMA communication unit gives an instruction for setting of the RDMA communication path in parallel with the transmission of the setting information. The computing machine further includes an RDMA control unit that secures a memory area for RDMA communication and transmits setting information including the memory area to the computing machine of the access destination.

Abstract: This communication system comprises a plurality of computers 1, 2 that each comprise: an optical transport path control unit 14 that adjusts the number of optical transport paths between the computer itself and a connection target computer and that sets the adjusted number of optical transport paths; a remote direct memory access (RDMA) communication unit 11 that, in accordance with the number of optical transport paths 4 announced from the optical transport path control unit 14, chunks data that is to be transferred to the connection target computer; and an RDMA control unit 16 that sets RDMA communication paths the number of which is the same as the number of the optical transport paths 4 pursuant to an instruction from the RDMA communication unit 11.

Abstract: An object of the present disclosure is to provide a data communication system, a computing apparatus, a data communication method, and a program, which are capable of highly reliable data transfer with low latency between computing apparatuses. The present disclosure achieves a highly reliable communication path by directly connecting computing apparatuses via an optical path and transmitting data through the optical path. Further, the present disclosure uses the optical path to achieve RDAM over wavelength transmission in which existing RDMA-enabled protocol stacks such as InfiniBand and TCP/IP/Ether are eliminated. The present disclosure eliminates the protocol stacks, enabling transfer with lower latency than in a case of “simply performing RDMA transmission over the wavelength path”.

Abstract: An intermediate device 10A includes a transfer unit 11 that transfers a request including data to be transmitted from a local 30 to a remote 50, and a generation unit 12 that generates a pseudo-response to the request and returns the pseudo-response to the local 30. The intermediate device 10B includes a discard unit 13 that discards a response to the request from the remote 50. An intermediate device 20B includes a generation unit 22 that generates a pseudo-request based on an initial request for requesting data transmission from the local 30 to the remote 50 and transmits the pseudo-request to the remote 50, and a transfer unit 24 that transfers a response including data to be transmitted from the remote 50 to the local 30. The intermediate device 20A includes the discard unit 21 that discards a subsequent request from the local 30.

Abstract: An object of the present disclosure is to make it possible to measure an IP flow corresponding to time-varying, high-speed traffic. The present disclosure is a device that monitors traffic in a network, the device comprising a memory that records, for each flow in the network, metadata and flow information to be used in measurement, wherein a traffic state is forecasted using a packet flowing in the network; and a recording area for the metadata and the flow information in the memory is set based on the forecasted traffic state.

Abstract: The communication apparatus 1 includes: a processing device 20 that processes communication data to be transmitted to and received from a partner apparatus 2; a transmission unit 14 that transmits the communication data to the partner apparatus 2; an internal state measurement unit 11 that measures a state related to transmission of the communication data between the processing device 20 and the transmission unit 14; and a determination unit 13 that determines a communication mode in communication with the partner apparatus 2 from the state. The transmission unit 14 transmits the communication data to the partner apparatus 2 in the determined communication mode.

Abstract: An object of the present disclosure is to make it possible to measure an IP flow corresponding to time-varying, high-speed traffic. The present disclosure is a device that monitors traffic in a network, the device comprising a memory that records, for each flow in the network, metadata and flow information to be used in measurement, wherein a traffic state is forecasted using a packet flowing in the network; and a recording area for the metadata and the flow information in the memory is set based on the forecasted traffic state.

Abstract: An object of the present disclosure is to provide a data communication system, a computing apparatus, a data communication method, and a program, which are capable of highly reliable data transfer with low latency between computing apparatuses. The present disclosure achieves a highly reliable communication path by directly connecting computing apparatuses via an optical path and transmitting data through the optical path. Further, the present disclosure uses the optical path to achieve RDAM over wavelength transmission in which existing RDMA-enabled protocol stacks such as InfiniBand and TCP/IP/Ether are eliminated. The present disclosure eliminates the protocol stacks, enabling transfer with lower latency than in a case of “simply performing RDMA transmission over the wavelength path”.

Abstract: An object is to provide a multipoint distribution system, a distribution method, a management apparatus, and a program which determine whether or not to switch between a current-use system and a backup system in consideration of the importance levels of distribution destinations. The multipoint distribution system according to the present invention includes a distribution destination system importance level database that stores the importance levels of distribution destinations. When a distribution destination not able to communicate with a current-use video distribution system is detected, the multipoint distribution system performs switching from the current-use video distribution system to a backup video distribution system only upon determining that the distribution destination is important by referring to the distribution destination system importance level database.

Abstract: An object is to provide a multipoint distribution system, a distribution method, a management apparatus, and a program which determine whether or not to switch between a current-use system and a backup system in consideration of the importance levels of distribution destinations. The multipoint distribution system according to the present invention includes a distribution destination system importance level database that stores the importance levels of distribution destinations. When a distribution destination not able to communicate with a current-use video distribution system is detected, the multipoint distribution system performs switching from the current-use video distribution system to a backup video distribution system only upon determining that the distribution destination is important by referring to the distribution destination system importance level database.

Abstract: A wavelength path reallocation method in a path reallocation apparatus for reallocating a wavelength path set in a communication network, including: a wavelength path designing step in which a wavelength path designing unit designs a reallocation destination wavelength path by performing calculation such that the number of use frequency regions in the communication network becomes smaller than a corresponding value before reallocation; and a wavelength path setting step in which a wavelength path setting unit changes a reallocation target wavelength path to the reallocation destination wavelength path by using free wavelength.

Abstract: A bandwidth variable communication apparatus includes: a route exchange unit including a route exchange function for switching an output port of a stream signal of one or more wavelengths input from an input port based on both or a part of wavelength and time, and including a bandwidth change function for changing passable frequency bandwidth in a section from the input port to the output port through which the stream signal passes; and a control unit including a control information transmit-receive function for transmitting and receiving control information for both or a part of the route exchange function and the bandwidth change function of the route exchange unit, and including a control function for controlling the route exchange unit based on the control information. All or a part of the input ports and the output ports are connected to other communication apparatuses via transmission routes.

Abstract: A wavelength path reallocation method in a path reallocation apparatus for reallocating a wavelength path set in a communication network, including: a wavelength path designing step in which a wavelength path designing unit designs a reallocation destination wavelength path by performing calculation such that the number of use frequency regions in the communication network becomes smaller than a corresponding value before reallocation; and a wavelength path setting step in which a wavelength path setting unit changes a reallocation target wavelength path to the reallocation destination wavelength path by using free wavelength.