33results about How to "Reduce sync delay" patented technology

A data synchronizing method between a server and a client is provided. The server and the client manage database changed after a previous synchronization of data shared by them. The database includes a sync anchor field for each data item. When a sync session is initiated upon request of the client, a last anchor is detected from the database stored in the client and a last anchor from the database stored in the server. The last anchor of the client is compared with the last anchor of the server. A client change log and a server change log are generated according to a comparison result based on a database change that occurred after the last anchor of client or server when the last anchor of the client is identical to the last anchor of the server. The databases are updated according to the client change log and the server change log.

A data synchronizing method between a server and a client is provided. The server and the client manage database changed after a previous synchronization of data shared by them. The database includes a sync anchor field for each data item. When a sync session is initiated upon request of the client, a last anchor is detected from the database stored in the client and a last anchor from the database stored in the server. The last anchor of the client is compared with the last anchor of the server. A client change log and a server change log are generated according to a comparison result based on a database change that occurred after the last anchor of client or server when the last anchor of the client is identical to the last anchor of the server. The databases are updated according to the client change log and the server change log.

The present invention discloses a method and an apparatus for synchronization in a communication system, the method includes: detecting whether a user equipment is in an uplink out-of-synchronization state; triggering, by a downlink scheduling entity, an uplink enhanced random access synchronization process, if the user equipment is in the uplink out-of-synchronization state; and obtaining, by an uplink scheduling entity, a user equipment identifier sent by the user equipment on which the uplink enhanced random access synchronization process is triggered, and informing the downlink scheduling entity via an interaction with the downlink scheduling entity that uplink synchronization of the user equipment is restored. By employing the method and the apparatus of the invention, the uplink synchronization is accomplished by using the existing enhanced random access technology of the current system and via the interaction between the uplink and downlink scheduling entities, the delay of the synchronization may be shortened effectively, the data transmission efficiency and the system resource utilization are improved, and the normal sending and transmitting of the downlink data may be guaranteed.

The invention discloses a centerless TDMA synchronization method suitable for wireless Ad hoc Network, belonging to the technical field of TDMA communication of the wireless Ad hoc Network. The method comprises the steps that a synchronization header is arranged on a distributed signal-sending time slot; a time frame counter is arranged on each node, and a time slot counter is arranged on each time frame of the different nodes; and after any node is started, information is intercepted, and the time frame counter is used for counting, wherein if the synchronization header of another node is received within one time frame, time of the node is synchronized with that of the corresponding node; if the synchronization headers of other nodes are not received, the time slot counter is used for counting; if the synchronization header is received before the next distributed signal-sending time slot, time of the node is synchronized with that of the corresponding node; and otherwise, the synchronization header of the node is sent out in the next distributed signal-sending time slot.

The present invention discloses a method and an apparatus for synchronization in a communication system, the method includes: detecting whether a user equipment is in an uplink out-of-synchronization state; triggering, by a downlink scheduling entity, an uplink enhanced random access synchronization process, if the user equipment is in the uplink out-of-synchronization state; and obtaining, by an uplink scheduling entity, a user equipment identifier sent by the user equipment on which the uplink enhanced random access synchronization process is triggered, and informing the downlink scheduling entity via an interaction with the downlink scheduling entity that uplink synchronization of the user equipment is restored. By employing the method and the apparatus of the invention, the uplink synchronization is accomplished by using the existing enhanced random access technology of the current system and via the interaction between the uplink and downlink scheduling entities, the delay of the synchronization may be shortened effectively, the data transmission efficiency and the system resource utilization are improved, and the normal sending and transmitting of the downlink data may be guaranteed.

The embodiment of the invention discloses a DB2 database data synchronization method, device and system. The method comprises the steps of obtaining a data synchronization request for a to-be-synchronized source library and a corresponding to-be-synchronized target library; if the request is a full-amount synchronization request, performing full-amount synchronization on the target library according to the data of the source library; if the request is an incremental synchronization request, acquiring log data generated by the source library in real time, analyzing the log data, and performingincremental synchronization on the target library according to an analysis result. According to the method, full-amount and incremental synchronization of the DB2 database can be realized, and the incremental synchronization mode of the method does not invade the source library and does not influence the service; besides, by expanding the cluster, sub-library and sub-table scene synchronization and sub-library and sub-table synchronization monitoring and coordination can be achieved, mapping relation configuration is conducted on the source library and the target library through middleware, data synchronization from the source library M to the target library N can be achieved, and more complex synchronization scenes are met; furthermore, the full-quantity and incremental synchronization process of the method supports breakpoint resume.

The invention discloses a data synchronization method between a host end and an FPGA accelerator, and the method comprises the steps: generating second state information according to the first state information of a first address space after the host end is detected to move data to a preset memory space, and writing the second state information into the second address space; after the second stateinformation on the second address space is detected, DMA is called to move the data in the preset memory space to the memory space of the FPGA accelerator, and the second state information is copiedto the first address space to achieve synchronization. Therefore, according to the method, the data synchronization operation is executed based on the state information on the two address spaces, thecontroller on one side of the FPGA accelerator is used for actively executing double-end memory data synchronization, the data synchronization delay is reduced, and the system throughput rate is increased. In addition, the invention further provides a double-end memory synchronizer, an FPGA accelerator and a data synchronization system, and the technical effects of the double-end memory synchronizer, the FPGA accelerator and the data synchronization system correspond to the technical effects of the method.

A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.

The invention relates to a method and device for synchronizing service data. The method comprises the steps of: synchronizing Mysql data serving as the service data to a Kafka cluster through a Maxwell assembly; synchronizing the data in the Kafka cluster to the HBase; and mapping the table stored in the HBase to a Hive library to finish the synchronization of the service data. According to the scheme of the invention, a Maxwell synchronization mode is adopted, no influence is caused to the running service, the delay is lower, more concurrency can be supported, and the flexibility is better.

The invention discloses a cloud computing-oriented high-performance block chain architecture method, which comprises a cloud computing-oriented block chain network architecture and a cloud computing-oriented block chain system architecture; wherein according to the cloud computing-oriented block chain network architecture, each block chain node is directly connected with an RDMA, so that an efficient communication mode with a network card can be directly realized by bypassing an operating system kernel; the cloud computing-oriented block chain system architecture specifically comprises a network layer, a consensus layer and a block chain layer. The method has the advantages that network communication is realized through RDMA, the block broadcasting speed can be increased, and therefore, the block synchronization delay can be reduced.

The invention relates to a distributed data synchronization method and system. The method comprises the following steps that: a scheduler inquires whether a synchronization task needs to be carried out from a source database, and elastically adjusts the query interval time of the scheduler according to a query result; the scheduler selects one synchronization component in a synchronization component cluster to execute the task; the synchronization component performs task segmentation and adopts a plurality of concurrent threads for processing; the synchronization component reads a synchronization data set from the source database and carries out data processing; and the synchronization component generates temporary unique identifiers to replace original unique identifiers of the synchronous data set, then writes the synchronous data set into the target database in batches, deletes updated old data records in the target database, and finally restores the original unique identifiers of the synchronous data set in batches. According to the distributed data synchronization method and system, the whole data synchronization performance is greatly improved.

The invention discloses a video and audio data processing system and method, and relate to the technical field of broadcasting of a broadcast television. The system comprises a video and audio source signal processing module configured to receive and process video and audio source signals to obtain video data and audio data respectively; an information processing module configured to copy and process the video data and the audio data to obtain target video data and / or target audio data; an information integration module configured to integrate the target video data and the target audio data to obtain original signals; a coding module configured to code the target video data and the target audio data according to preset coding parameters to obtain corresponding video and audio coding signals; an encapsulation module configured to encapsulate the original signals and the video and audio coding signals to obtain transmission signals and an IP signal of the broadcast television. According to the system and the method, the same video and audio source signals can be simultaneously output in different information channels.

The invention provides a data synchronization implementation method and device, electronic equipment and a storage medium. The data synchronization implementation method comprises the following steps: acquiring index data reported by a data sending end and a data receiving end in a plurality of preset time periods; determining a data compression algorithm and a data compression level according to the index data; and returning the data compression algorithm and the data compression level to the data sending end and the data receiving end, so that the data sending end and the data receiving end perform data synchronization according to the data compression algorithm and the data compression level. The method can improve the transmission efficiency, reduce data compression and decompression or transmission delay, improve the network utilization rate, and reduce the total data synchronization delay.

The invention provides a high-availability database log synchronization method, which comprises the following steps: a slave node creates at least one recv-thread thread to process and receive log block data, the log block data is formed by segmenting log stream data by a master node, and each piece of log block data comprises log header information and log data; when the recv-thread thread receives one piece of log block data each time, header information is extracted from the log block data, and the log block data is placed in a receiving queue according to the header information, wherein the log receiving queue is a pointer array, each member in the array is a structural pointer, each structural pointer points to a structural head, two linked lists, namely a sequence linked list and an out-of-order linked list, are arranged in the structural head, and each node in the linked lists is log block data. The log receiving and processing speed of the slave nodes in the cluster can be effectively increased, log synchronization delay of the master nodes and the slave nodes is reduced, and high availability of the database cluster is improved.

The invention discloses a PostgreSQL database synchronization method and a PostgreSQL database synchronization system. The method comprises the following steps: acquiring a WAL log of a PostgreSQL database; configuring and registering a Kafka connector, and connecting the PostgreSQL database and the Kafka cluster; monitoring the WAL log, and storing WAL log data obtained through monitoring in a Kafka part; consuming the top data in the Kafka cluster, encapsulating the acquired top data into data in a Json format, and synchronizing the encapsulated data in the Json format into an ElasticSearch database. According to the method and the system, a partition algorithm is adopted, partition keys can be flexibly defined through configuration parameters, and databases with the same characteristics can be synchronized into the same partition for ordered consumption and storage of signing data.

The invention discloses a federated learning training acceleration method for a heterogeneous scene. The federated learning training acceleration method for the heterogeneous scene comprises the following steps: S1, distributing a training task to a server and a client; and S2, running a client algorithm and a server algorithm according to the training task to obtain a client running result and a server running result. According to the federated learning training acceleration method for the heterogeneous scene provided by the invention, the problem of low synchronization efficiency in existing federated learning can be solved.

The invention discloses a virtual CPU scheduling method. The virtual CPU scheduling method comprises the following steps: determining a target virtual CPU according to a received virtual CPU scheduling instruction; determining a physical machine CPU set corresponding to the target virtual CPU; judging whether an alternative physical machine CPU of which the current load is smaller than the global average load exists in the physical machine CPU set or not; If yes, scheduling the target virtual CPU to an alternative physical machine CPU with the minimum current load in the physical machine CPU set; If not, scheduling the target virtual CPU to the physical machine CPU with the minimum global load. According to the method and the device, the load balancing among the CPUs of the physical machine can be realized, and the synchronization delay among the virtual CPUs is reduced. The invention furthermore discloses a virtual CPU scheduling apparatus, an electronic device and a storage medium, which have the above beneficial effects.

The invention discloses a centerless TDMA synchronization method suitable for wireless Ad hoc Network, belonging to the technical field of TDMA communication of the wireless Ad hoc Network. The method comprises the steps that a synchronization header is arranged on a distributed signal-sending time slot; a time frame counter is arranged on each node, and a time slot counter is arranged on each time frame of the different nodes; and after any node is started, information is intercepted, and the time frame counter is used for counting, wherein if the synchronization header of another node is received within one time frame, time of the node is synchronized with that of the corresponding node; if the synchronization headers of other nodes are not received, the time slot counter is used for counting; if the synchronization header is received before the next distributed signal-sending time slot, time of the node is synchronized with that of the corresponding node; and otherwise, the synchronization header of the node is sent out in the next distributed signal-sending time slot.

The invention involves a distributed data synchronization method and system.The method includes steps: the scheduler needs to perform synchronous tasks to the source database, and adjust the interval time according to the elasticity of the query results; the scheduler selects one of the synchronous components in the synchronous component cluster to perform the task;Use multiple parallel thread processing; synchronous components read the synchronous dataset from the source database and perform data processing; synchronous components generate temporary unique logo to replace the original unique logo of synchronous dataset, and then write the quantity of the synchronous data set to the target databaseThere are updated old data records in the target database, and finally restore the original unique logo of the synchronous data set in batches.The present invention has greatly improved the performance of the entire data synchronization.

The invention relates to the field of databases, in particular to a method and a device for synchronously updating data in batches in a database. The method mainly comprises the steps of obtaining source updating operation needing to be synchronized in a source end database; obtaining a condition column information set and an updating column information set in each source updating operation; generating a target update statement for synchronization according to the condition column information set and the update column information set of all the source update operations; according to the value of the condition column in the condition column information set and the value of the updating column in the updating column information set, generating a binding data row for the condition column and the updating column of the target updating statement; and submitting the target update statement as a target update operation to a target end database, and updating the target database in batches by using the values in the bound data line. According to the method and the device, the batch binding of the data lines cannot be realized by using multiple source updating operations of the batch binding of the data lines at present, and the data synchronization is completed by using the batch binding of the data lines, so that the effect of reducing the synchronization delay is achieved.

The invention discloses a synchronization optimized dispatching system based on group dispatching in the virtualization environment. The synchronization optimized dispatching system comprises a VCPU initial mapping module, a Credit distribution module, a VCPU dispatching module, a Credit consumption module and a Credit historical statistics module, wherein the VCPU initial mapping module is in charge of mapping a VCPU to a PCPU operation queue; the Credit distribution module distributes S time slices to each VCPU of VMs according to weights; the VCPU dispatching module is in charge of dispatching a certain VCPU to a current PCPU operation queue within every time slice, and determining the particle size of VM group dispatching for operation of parallel loads according to the Credit historical statistics module so as to implement the group dispatching strategy; the Credit consumption module is in charge of updating a credit value of each VCPU after one time slice is operated completely; the Credit historical statistics module records the dispatching history of the VCPU with windows being K, and maintains the total operation time of loads of two types so as to provide the group particle size value needed by the VCPU dispatching module. The performance of the loads can be improved by fully utilizing the types of the loads, the utilization rate of a CPU is improved, and at the same time, energy consumption can be reduced.

The invention relates to a low-delay wireless control system for virtual reality experience equipment. The control system is connected to the virtual reality experience equipment; the control system comprises a control end PC, a relay, an AP controller, a wireless AP and head-mounted equipment, wherein the control end PC is connected to the virtual reality experience equipment through the relay; the control end PC is connected to the wireless AP through the AP controller; the wireless AP is connected to the head-mounted equipment through a wireless network; the head-mounted equipment receivesa control instruction of the control end PC through an asynchronous duplex UDP, and meanwhile, the control end PC performs deep optimization on the sent instruction, and the transmission data amount is reduced to the minimum. Compared with the prior art, the system has the advantages that the resource consumption of the head-mounted equipment and the control end PC is effectively reduced, and thestability of the system is greatly improved.

The invention discloses a method and device for realizing fast table synchronization between line cards. The method comprises the following steps: creating a loop of a unidirectional synchronous data transmission channel between line cards; any line card will send out synchronization when the fast table changes. message, and the synchronization message is sequentially transmitted among the line cards through the loop of the unidirectional synchronization data transmission channel to perform synchronization operation; until the line card that initially sent the synchronization message receives the synchronization message sent by itself, then End the synchronization operation and delete the synchronization message. In the embodiment of the present invention, a synchronous data transmission channel loop is established between line cards, so that synchronization messages can be transmitted in the synchronous data transmission channel loop, thereby reducing the processing burden of the main control board; and in a network with n line cards Every time a synchronization operation is performed on the system, only the interaction of n packets can be completed, and once the synchronization is successful, there will be no more synchronization message packets in the system, thereby improving the synchronization efficiency.

The invention discloses a virtual machine scheduling method, device and equipment, and a readable storage medium. The method comprises the steps of obtaining a pcpu utilization rate of each physical cpu; according to the pcpu utilization rate, determining a physical cpu to be adjusted in the physical cpu; determining a target sub-thread in the sub-threads according to the vcpu utilization rate of the sub-threads of the virtual machine on the physical cpu to be adjusted; and scheduling the target sub-thread from the source physical cpu to the target physical cpu; According to the method, device and equipment, the vcpu distribution and scheduling of the virtual machine are dynamically controlled by utilizing the pcpu utilization rate of each physical cpu and the vcpu utilization rate of the sub-thread of the virtual machine, so that the pcpu utilization rate of each physical cpu can be balanced, the synchronization delay of the virtual machine is reduced, and the performance of the virtual machine is improved; In addition, synchronous scheduling does not need to be carried out on all the vcpu of the virtual machine, and the situations of fragments used by the cpu and priority inversion are reduced.

The invention provides a distributed multi-copy data synchronization method, a distributed multi-copy data synchronization system and a server. The method comprises the following steps of: splitting transaction data of each transaction operation into at least one piece of record information; generating an update version number corresponding to each piece of record information, and transmitting therecord information of the at least one transaction operation and the corresponding update version number to a target server; and on the target server, verifying the update version number to determinewhether to update the corresponding record information to the target server or not, so that the distributed multi-copy data synchronization efficiency can be improved.

The application provides a dual-CPU synchronization method and device for a security system. The device includes a first logic gate circuit and a second logic gate circuit. An output end of a first CPU is connected to a first input end of the first logic gate circuit and a first input end of the second logic gate circuit. An output end of a second CPU is connected to a second input end of the first logic gate circuit and a second input end of the second logic gate circuit. Output ends of the first logic gate circuit and the second logic gate circuit are connected to an input end of the first CPU and an input end of the second CPU, respectively. The first logic gate circuit and the second logic gate circuit respectively output signals to the dual CPU in response to a synchronization signalfrom the dual CPU so that the dual CPU determines whether to synchronize based on the output signals respectively from the two logic gate circuits. The dual CPU synchronization is completed by directly using hardware semaphores, the synchronization efficiency of the dual CPU is increased, the program design is simplified, the synchronization delay is small, and the reliability is high.

The present application discloses a data synchronization method between a host end and an FPGA accelerator, comprising: after detecting that the host end moves data to a preset memory space, generating second state information according to the first state information of the first address space, And write into the second address space; After detecting the second state information on the second address space, call DMA to move the data in the preset memory space to the memory space of the FPGA accelerator, and copy the second state information to the first address space for synchronization. It can be seen that this method realizes the data synchronization operation based on the status information on the two address spaces, and the controller on the side of the FPGA accelerator actively performs the dual-end memory data synchronization, which reduces the data synchronization delay and improves the system throughput. In addition, the present application also provides a dual-terminal memory synchronizer, an FPGA accelerator and a data synchronization system, the technical effects of which are corresponding to those of the above method.

The invention discloses a synchronization method for querying table building operation, which comprises the following steps of S1 capturing the query table building operation of a source end database,and extracting a query table building SQL statement of the query table building operation; S2 judging whether the query table building SQL statement meets the condition of synchronizing with the SQLstatement or not, and if yes, going to the step S3; S3 sending the query table building SQL statement to a target end database for synchronization, enabling the source end database to continue to track the thing log flow of the query table building SQL statement; and directly discarding the INSERT operation log related to the query table building operation, and notifying the target end database toend the synchronization process of the query table building SQL statement when a submitted log in the thing log stream is captured. According to the synchronization method for the querying table building operation, the synchronization time consumption of the query table building operation can be effectively reduced.

The invention discloses a method for constructing a high-performance block chain oriented to cloud computing, including constructing a block chain network architecture oriented to cloud computing and a block chain system architecture oriented to cloud computing. The chain network architecture enables each blockchain node to be directly connected through an RDMA adapter, which can bypass the operating system kernel to achieve an efficient communication mode directly with the network card; build a cloud computing-oriented blockchain system architecture, specifically including the network layer, consensus layer, block The advantage of the chain layer is that network communication is realized through RDMA, which can increase the block broadcast speed and reduce block synchronization delay.