Abstract: A recording medium recording a program for causing a computer to execute processing includes: accumulating a packet in a first memory; accumulating, in a second memory, first information regarding communication performance of a connection which is used to transfer the packet in association with second information indicating the connection based on the packet; registering, for each of connections, the second information in a third memory at time intervals with reference to the second memory in association with one of index value ranges including an index value indicating the communication performance of the respective connections; extracting, with reference to the third memory, a packet which is transferred through a connection corresponding to a specific index value range out of packets that are accumulated in the first memory and for which a first time is elapsed from acquisition of the packets; and storing the extracted packet in a fourth memory.

Abstract: A non-transitory computer-readable storage medium storing therein a packet analysis program for causing a computer to execute a process comprising detecting, from a plurality of received ACK packets, a successive ACK packet group including a plurality of ACK packets for which each reception interval is smaller than a first reference value and in which a round-trip time of each ACK packet becomes shorter in order of reception, and estimating wireless quality based on the number of ACK packets constituting the successive ACK packet group.

Abstract: When a control unit performs a first operation on a data group, the control unit registers operation information corresponding to the data group in transfer control information. When the control unit extracts the data group as a transfer target, the control unit temporarily stores the corresponding operation information as stored information and transfers the data group to a storage apparatus. When the control unit performs a second operation on the data group while the data group is being transferred, the control unit updates the operation information registered in the transfer control information. When the transfer of the data group is completed, the control unit compares the operation information registered in the transfer control information with the stored information. If these items of information do not match, the control unit retransfers the data group to the storage apparatus.

Abstract: A storage medium having a program that executes a process including acquiring a packet formed by dividing data to be transmitted to receiving apparatus by transmitting apparatus and a packet that includes an ACK number to identify an amount of the data about which reception of packets transmitted from the transmitting apparatus to the receiving apparatus by the receiving apparatus has been confirmed; when the acquired packet is a retransmission packet and a lost packet corresponding to the retransmission packet has not been acquired, classifying a position of the lost packet as any of a last packet, an intermediate packet, and a leading packet by comparing the ACK number included in the retransmission packet and the ACK number included in each of packets previous and subsequent to the lost packet; and calculating a retransmission time by a calculation method identified based on the classified position of the lost packet.

Abstract: An information processing apparatus, including: a memory unit; and a processor configured to perform a migration process of migrating a migration source file system to a migration target file system, the memory unit is configured to store first and second information, the first information managing a target object of the first migration process stored in the migration source file system and the target object to be stored in the migration target file system, and the second information managing a progress status of the first migration process for each object, the processor is configured to: select either or both of the migration source and target file systems based on the first and second information when a write request for the target object is received from a host apparatus; and perform a process related to the write request on the file system selected.

Abstract: A disclosed information processing apparatus includes a memory and a processor. And the processor is coupled to the memory and configured to: detect a first virtual node that is a bottleneck from among plural virtual nodes included in a virtual system; and identify a second virtual node that is a bottleneck based on a first number of cache misses that occurred when a first program for realizing the first virtual node was executed and a second number of cache misses that occurred when a second program for realizing a second virtual node that is other than the first virtual node was executed.

Abstract: An image compression method, performed by a computer, includes: acquiring image data of an image captured by an imaging device mounted to a vehicle; setting a segmented region in a reference image corresponding to an image to be compressed and encoded; enlarging the reference image so that a magnification rate of a region including the periphery of the reference image is greater than a magnification rate of a region including a center point of the reference image in the segmented region, the center point being a contact point of an optical axis of the image incident to the imaging device and an imaging element in the imaging device; generating a predictive image in accordance with the enlarged reference image; and compressing and encoding image data of the image to be encoded in accordance with the generated predictive image.

Abstract: A recording medium recording a program for causing a computer to execute processing includes: accumulating a packet in a first memory; accumulating, in a second memory, first information regarding communication performance of a connection which is used to transfer the packet in association with second information indicating the connection based on the packet; registering, for each of connections, the second information in a third memory at time intervals with reference to the second memory in association with one of index value ranges including an index value indicating the communication performance of the respective connections; extracting, with reference to the third memory, a packet which is transferred through a connection corresponding to a specific index value range out of packets that are accumulated in the first memory and for which a first time is elapsed from acquisition of the packets; and storing the extracted packet in a fourth memory.

Abstract: A method for analyzing communication qualities between virtual machines serving as transmission sources and virtual machines serving as transmission destinations on a virtual network includes identifying, by a computer, based on the temporal sequence of the input queue information and the temporal sequence of the output queue information, a first pair and a second pair as mirroring targets, wherein the input queue information indicates a first queue length indicating a number of pieces of data addressed from one of the transmission sources to one of the transmission destinations, wherein the output queue information indicates a second queue length indicating a number of pieces of data included in an output queue of the one of the transmission destinations.

Abstract: An apparatus allocates a packet-identifier to each packet captured from a network, and stores the each packet in a buffer. The apparatus associates, with each of the packet-identifiers, a connection-identifier specifying a connection of a packet identified by the each packet-identifier, and detects a connection to which a primary abnormality is occurring by analyzing packets stored in the buffer.

Abstract: When a control unit performs a first operation on a data group, the control unit registers operation information corresponding to the data group in transfer control information. When the control unit extracts the data group as a transfer target, the control unit temporarily stores the corresponding operation information as stored information and transfers the data group to a storage apparatus. When the control unit performs a second operation on the data group while the data group is being transferred, the control unit updates the operation information registered in the transfer control information. When the transfer of the data group is completed, the control unit compares the operation information registered in the transfer control information with the stored information. If these items of information do not match, the control unit retransfers the data group to the storage apparatus.

Abstract: A computer obtains a first packet group transmitted wirelessly by a first wireless communication apparatus and a second packet group transmitted wirelessly by a second wireless communication apparatus. The computer then detects a first non-communication period, during which there are no packets transmitted by the first wireless communication apparatus for a prescribed time or longer, and also detects a second non-communication period, during which there are no packets transmitted by the second wireless communication apparatus for the prescribed time or longer. The computer then determines based on an overlap between the first and second non-communication periods whether the first and second wireless communication apparatuses are connected to the same wireless base station.

Abstract: A non-transitory computer-readable storage medium storing therein a packet analysis program for causing a computer to execute a process comprising detecting, from a plurality of received ACK packets, a successive ACK packet group including a plurality of ACK packets for which each reception interval is smaller than a first reference value and in which a round-trip time of each ACK packet becomes shorter in order of reception, and estimating wireless quality based on the number of ACK packets constituting the successive ACK packet group.

Abstract: A packet analysis method includes acquiring a first acknowledge packet and a second acknowledge packet transmitted from the first device; acquiring a plurality of packets transmitted from the second device during a period from reception of the first acknowledge packet to reception of the second acknowledge packet; identifying a number of packets corresponds to data transmitted from the second device, by calculating a difference between a first identification number corresponding to the first acknowledge packet and a second identification number corresponding to the second acknowledge packet; calculating a plurality of bandwidth values, a number of the plurality of bandwidth values is identical to the number of packets, based on acquisition timings of the plurality of packets and an interval between the acquisition timings of two adjacent packets; and determining a bandwidth value that is to be removed from the plurality of bandwidth values by comparing the plurality of bandwidth values.

Abstract: A storage medium having a program that executes a process including acquiring a packet formed by dividing data to be transmitted to receiving apparatus by transmitting apparatus and a packet that includes an ACK number to identify an amount of the data about which reception of packets transmitted from the transmitting apparatus to the receiving apparatus by the receiving apparatus has been confirmed; when the acquired packet is a retransmission packet and a lost packet corresponding to the retransmission packet has not been acquired, classifying a position of the lost packet as any of a last packet, an intermediate packet, and a leading packet by comparing the ACK number included in the retransmission packet and the ACK number included in each of packets previous and subsequent to the lost packet; and calculating a retransmission time by a calculation method identified based on the classified position of the lost packet.

Abstract: An image compression method, performed by a computer, includes: acquiring image data of an image captured by an imaging device mounted to a vehicle; setting a segmented region in a reference image corresponding to an image to be compressed and encoded; enlarging the reference image so that a magnification rate of a region including the periphery of the reference image is greater than a magnification rate of a region including a center point of the reference image in the segmented region, the center point being a contact point of an optical axis of the image incident to the imaging device and an imaging element in the imaging device; generating a predictive image in accordance with the enlarged reference image; and compressing and encoding image data of the image to be encoded in accordance with the generated predictive image.

Abstract: A throughput measuring method includes: acquiring a plurality of data packets at an observation point on a network, the plurality of data packets being transmitted from a transmission source apparatus and received by a transmission destination apparatus; calculating a plurality of round trip times, for each of the data packets, from a time point of acquisition of each of the data packets transmitted from the transmission source apparatus to a time point of acquisition of response packet corresponding to each of the data packets; identifying a measurement time section including the plurality of calculated round trip times increasing in ascending order of identification numbers of the response packets; and calculating a throughput of the identified measurement time section based on data quantities of the plurality of data packets transmitted from the transmission source apparatus during the identified measurement time section.

Abstract: A packet storage method includes receiving a plurality of packets from a network including a plurality of connections, associating, with each of the packet, a connection via which the corresponding packet has passed, specifying a connection, among the plurality of connections, in which an error has occurred, based on analysis of the plurality of packets, identifying the packet which has passed through the connection in which the error has occurred, and storing, in a storage device, the identified packet, among the plurality of received packets.

Abstract: A data processing device partitions a data sequence including a plurality of items of variable length block data into a plurality of search unit regions of a predetermined length, manages each variable length block data per search unit region, when making a data access to the data sequence, specifies a search unit region to which access target variable length block data belongs, based on position information included in a data access request, and searches data access target variable length block data from the variable length block data belonging to the specified search unit region, so that it is possible to easily specify access target variable length block data in the data sequence.

Abstract: A disclosed information processing apparatus includes a memory and a processor. And the processor is coupled to the memory and configured to: detect a first virtual node that is a bottleneck from among plural virtual nodes included in a virtual system; and identify a second virtual node that is a bottleneck based on a first number of cache misses that occurred when a first program for realizing the first virtual node was executed and a second number of cache misses that occurred when a second program for realizing a second virtual node that is other than the first virtual node was executed.