52results about How to "Reduce switching overhead" patented technology

A multithreaded computer system of the present invention includes a plurality of processor elements (PEs) 101 to 103, and a parallel processor control unit 200, which switches threads in each PE, and the parallel processor control unit 200 includes: a plurality of execution order registers, which hold, for each processor element, an execution order of threads to be executed; a plurality of counters 230, which count an execution time for a thread that is being executed by each processor element and generate a timeout signal when the counted time reaches a limit assigned to the thread; and a thread execution scheduler unit 210, which switches the thread that is being executed to the thread to be executed by each processor element based on the execution order held in said execution order register and the timeout signal.

The invention discloses a multi-channel multi-path routing protocol for vehicle team ad-hoc networks. The multi-channel multi-path routing protocol mainly comprises: (1) each vehicle node is made to work on a service channel, the vehicle nodes using the same service channel form a channel transmission path in a vehicle team, and multiple transmission paths of multiple channels are formed in the vehicle team; (2) each vehicle node acquires position, speed and motion direction information of other vehicle nodes through an adaptive distributed position service; and (3) a multi-channel greedy forwarding algorithm is adopted: when the vehicle nodes send or forward a data message, a next-hop neighbor node is selected by use of the greedy forwarding algorithm according to the position of a destination node and the working channel utilization rate of a neighbor node until the data message reaches the destination node. By adopting the provided multi-channel multi-path routing protocol for vehicle team ad-hoc networks, vehicle team communication is enabled to be fully self-organized without relying on any infrastructure, adjacent vehicle nodes are allowed to communicate on different channel transmission paths at the same moment, the network throughput is improved, and the routing protocol supports multi-hop big data transmission and has practical application prospects.

The invention discloses a packet structure and an interest packet transfer, source switching and source agency selection method. The packet structure is used in a content center network. The content center network is divided into a plurality of mobile management regions, wherein each mobile management region has at least one content source agency and names the content source agency or a router in the region; when the content source agency receives an interest packet, a corresponding position marker is added into the interest packet according to position information of a mobile content source; an agency handling label is arranged to enable the interest packet to be transferred to the mobile content source according to the position marker; and the interest packet of the content center network expands one position marker and the agency handling label, one position marker is expanded in a data packet and used for showing the position of content, and the agency handling label shows that the position marker in the interest packet is set by the content source agency.

The invention relates to a virtual central processing unit (CPU) scheduling method; belongs to the technical field of computer virtualization; and solves the problem that existing virtual CPU scheduling methods adopts fixed length time slices to perform scheduling on all virtual CPUs, accordingly virtual machine performance is affected due to resource limit. The virtual CPU scheduling method comprises the steps of initializing, updating virtual CPU credit values, joining the queue, selecting running the virtual CPU, processing integrated optics (OI) request bitmap, and running. The virtual CPU scheduling method sets scheduling time slices according to virtual CPU running state, during virtual CPU scheduling, and dynamically sets the scheduling time slices of the virtual CPU according to the IO request bitmap and a scheduling time slice table of a virtual machine which the virtual CPU belongs; the OI request bitmap reflects running characters of each virtual machine, accordingly virtual machines mainly basing on CPU operation have small switching overhead, virtual machines mainly basing on OI operation have short response delay, and further the effects of being suitable for various different application environment and meeting different application service type requirements are achieved.

The invention discloses a disk array reconstruction optimization method and device. The method comprises: acquiring all write data and hot data in a storage system, wherein the hot data is data read twice at least in the whole reconstruction period of a disk array; reconstructing the disk array so that the reconstructed disk array enters a redirected state, and migrating the write data and the hot data in the reconstruction process to an idle storage device, wherein the idle storage device is a storage agent device; and when the reconstruction of the disk array is accomplished, migrating the write data and the hot data from the idle storage device to the reconstructed disk array. The method improves the stability of the storage system.

An exemplary embodiment provides an operating method of a software fault-tolerant handling system, and more particularly, to an operating method of a fault-tolerant handling system in which a fault recovery is easy in a fault-tolerant technology of copying with various faults which can occur in a computing device.

The invention provides a method for access network selection according to real-time network conditions, and relates to a network selection optimization method for a heterogeneous network. The heterogeneous network is a network comprising a cellular network and a WLAN, the cellular network is a first network, and the WLAN is a second network. When the service of the first network to which equipment joins is not satisfactory, according to a network list provided by ANDSF and RAN Rules, the equipment offloads the traffic from a top network, and when the load of the first network is too high, or the first network is congested, the equipment can timely switch to the second network. Through adoption of the method, a shortcoming that a better network cannot be selected timely is improved, the network performance is improved, and the resource utilization is maximized.

The invention discloses a method and a system for determining an execution sequence of a test case suite. The method comprises the steps as follows: the single case switching cost between any two test cases in an initial test case suite is calculated; h test cases with all combination possibilities are selected from the initial test case suite, and all the possible first optimum execution sequences and first switching costs which are formed by the h test cases are obtained; according to the first switching costs and the single case switching cost, all possible second optimum execution sequences and second switching costs which are formed by h+1 test cases are calculated and obtained; the second optimum execution sequences and the second switching costs are taken as the first optimum execution sequences and the first switching costs respectively, h is increased by 1, a previous step is returned until the second optimum execution sequences comprise all test cases; and a second optimum execution sequence with the smallest second switching cost is taken as the optimum execution sequence, so that minimum reconfiguration times of parameters in a test can be realized, and the expenditure is reduced.

The invention discloses three schemes for a method for measuring carrier frequency information in a wireless communication system. One of the three schemes includes that a base station sends out a quiet period indication signaling at a downlink channel, and a terminal which successfully receives the quiet period indication signaling sent out by the base station measures the carrier frequency information at a first time-frequency resource and feeds back a measurement result of the carrier frequency information to the base station at a second time-frequency resource. The invention also discloses three schemes for a system for measuring the carrier frequency information in the wireless communication system. One of the three schemes includes that a carrier frequency information measurement and feedback unit is used on the condition that the base station sends out the quiet period indication signaling at the downlink channel, the terminal which successfully receives the quiet period indication signaling sent out by the base station measures the carrier frequency information at the first time-frequency resource and feeds back the measurement result of the carrier frequency information to the base station at the second time-frequency resource. By the aid of the method and the system, the base station can know channel quality situations of all terminals on the current carrier frequency.

The invention discloses a chip system which is applied to the technical field of virtualization. The chip system comprises a source physical processor, a control device, an intermediate device, a sending device and a target physical processor, a host machine or a virtual machine runs on the source physical processor, and a register in the control device receives information written by the host machine or the virtual machine and used for triggering virtual interruption. The control device sends the information used for triggering the virtual interrupt in the register to the intermediate device; the intermediate device triggers the virtual interrupt according to the information for triggering the virtual interrupt and sends the virtual interrupt to the sending device; the transmission device transmits the virtual interrupt to the target physical processor. The scheme is used for reducing the overhead of switching from the virtual machine to the host machine or from the user mode of the host machine to the kernel mode of the host machine due to virtual interruption.

A threshold mechanism is provided so that producers and corresponding consumers executing on the same resource (eg, CPU) can switch contexts between them in a manner that reduces the overall number of such context switches. The threshold mechanism is associated with a buffer into which a producer stores packets that reach a specified threshold before allowing consumers to delete packets. The buffer has an upper limit on being able to store in relation to the number of packets in the buffer. When no more packets are produced, a flush empties the buffer of any remaining packets. This reduction in the overall number of context switches generally results in better performance at the expense of more latency.

The embodiment of the invention provides a GTP downlink data transmission optimization method and device. The method comprises the steps of analyzing an obtained first Ethernet data packet; if judgingthat the first Ethernet data packet comprises a first GTP data packet, extracting a tunnel ID and a payload in the first GTP data packet; searching first destination terminal information corresponding to the tunnel ID in the first GTP data packet; and storing the first destination terminal information and the payload in the first GTP data packet in a buffer area. According to the GTP downlink data transmission optimization method and device provided by the embodiment of the invention, the IP protocol stack of the Linux system kernel is logically avoided, and the switching overhead of the kernel mode and the user mode is reduced. After the Ethernet data packet is received, the GTP data is directly processed in the Linux system kernel mode, so that the GTP data processing flow is greatly simplified, the data processing efficiency is improved, and the data transmission rate is further improved.

According to the computer equipment, in the virtualized I/O process, privilege level switching in the synchronous processing process is achieved through a redirection device in a processor, the virtualized privilege level of a VM is directly switched to the user mode of a host, and corresponding exception processing is executed. In the asynchronous processing process, the asynchronous interrupt request transmission can be realized through the virtual event notification device and the interrupt controller in the processor without the kernel mode of the host. According to the method, the switching overhead is reduced in the synchronous processing process or the asynchronous processing process, and the performance of the computer equipment is improved.

The invention discloses a local forwarding system for cross-device link aggregation, which belongs to the technical field of link aggregation, and comprises a local forwarding system establishment stage and a local forwarding stage, and is characterized in that in the local forwarding system establishment stage, a VP mapping table is firstly established; then, the message sent by the host reachesany VAL device to carry out local learning; redirection processing is performed on the message after local learning, the message is redirectioned to an INT port, and the message is sent to an oppositeterminal; and then learning is carried out based on a VP port converted from a VLAN ID field in the VAL TAG, and after the forwarding table entry is synchronously learned, forwarding messages arriving at any VAL device subsequently are forwarded through local table look-up. The method is simple in software processing logic, easy to develop, short in period, low in requirement for platforms and resources, low in influence and free of software maintenance of MAC address forwarding tables, packaging/de-packaging and other operations.

The invention discloses a task logic processing method. The method comprises: determining task logic contained in a task; and running the task logic contained in the task in one thread. By the adoption of the method, the problems that in the prior art, thread switching expenditure is increased, and processing time delay is increased are solved.

The embodiments of the invention disclose an online energy consumption management method of a large-scale server cluster. Under the condition that it is ensured that the CPU utilization rate of starting servers is equal to a given target value, servers in a cluster are dynamically managed according to load conditions so as to enable energy consumption of the cluster to be the lowest. Variables are defined for each server model in the cluster, an energy consumption management problem is described into a planning problem, and accordingly, the switch state, the work frequency and the load of each server are determined according to a solving result of the planning problem. The planning variable defining mode used by the invention can greatly reduce the quantity of the variables, even if the method is applied to a large-scale cluster, the planning problem can still be solved in an online mode. The method allows the server frequency to be switched between two adjacent discrete frequencies so as to prevent performance waste, and at the same time, the quantity of the servers needing to be switched between the two frequencies is also reduced as much as possible so that the switching cost is decreased. The invention further discloses an online energy consumption management apparatus of a large-scale server cluster.

The invention provides a thread processing device and method and a computer system. The thread processing device comprises a collection unit, a calculation unit, a partition unit, a judgment unit and an execution unit. The collection unit is used for collecting a plurality of threads to be executed within the scheduled time. The calculation unit is used for calculating the memory access proportion of each thread in more threads in the executing process. The partition unit is used for partitioning the threads into n groups based on the memory access proportion of each thread. The judgment unit is used for judging whether the threads in one group of the n groups are executed completely or not. The execution unit is used for continuing to execute the threads in the one group on the condition that the threads in the one group of the n groups are not executed completely, and executing the threads of the other groups on the condition that the threads in the one group of the n groups have been executed completely. According to the thread processing device and method and the computer system, the frequentness of repeated switching of frequency can be reduced effectively, so switching expenditures are reduced effectively, power consumption is lowered and efficiency is improved.

The invention provides a method and system for concurrent processing of an API request. The method comprises the steps that S1, if a current task corresponding to the current API request comprises anI/O operation, a first triad of the current task is generated by using a current service co-routine; S2, when the asynchronous waiting time of the current service co-routine reaches preset duration, the scheduling logic of a main thread is switched to other service co-routines meeting preset conditions, and second triads generated by the other service co-routines are acquired; S3, according to theorder-preserving identifier of the current task in the first triad and order-preserving identifiers of other tasks in the second triads, the current task and the other tasks are distributed to a waiting queue by using a scheduling thread; S4, the current task and other tasks are processed by using a task processing thread, and processing results are stored in a request result queue of the first triad and the second triads. The method and the device achieve order-preserving high-concurrent processing of the API request.