57 results about "Uniform memory access" patented technology

A semiconductor chip comprising memory controller circuitry having interface circuitry to couple to a memory channel. The memory controller includes first logic circuitry to implement a first memory channel protocol on the memory channel. The first memory channel protocol is specific to a first volatile system memory technology. The interface also includes second logic circuitry to implement a second memory channel protocol on the memory channel. The second memory channel protocol is specific to a second non volatile system memory technology. The second memory channel protocol is a transactional protocol.

The invention discloses an extension Cache Coherence protocol-based multi-level consistency domain simulation verification and test method. An extension Cache Coherence protocol-based multi-level consistency domain CC-NUMA (Cache Coherent Non-Uniform Memory Access) system protocol simulation model is constructed. A protocol table inquiring and state converting executing mechanism in a key node of a system ensures that a Cache Coherence protocol is maintained in a single computing domain and is simultaneous maintained among a plurality of computing domains, and accuracy and stability are ensured by intra-domain and inter-domain transmission; and a credible protocol inlet conversion coverage rate evaluating drive verification method is provided, transactions are processed by loading an optimized transaction generator promoting model, a coverage rate index is obtained after the operation is ended, and the verification efficiency is increased in comparison with a random transaction promoting mechanism. Through constructing one multi-processor multi-consistency domain verification system model and developing relevant simulation verification, the applicability and the effectiveness of the method are further confirmed.

A dispatcher for a non-uniform memory access computer system dispatches threads from a common ready queue not associated with any CPU, but favors the dispatching of a thread to a CPU having a shorter memory access time. Preferably, the system comprises multiple discrete nodes, each having a local memory and one or more CPUs. System main memory is a distributed memory comprising the union of the local memories. A respective preferred CPU and preferred node may be associated with each thread. When a CPU becomes available, the dispatcher gives at least some relative priority to a thread having a preferred CPU in the same node as the available CPU over a thread having a preferred CPU in a different node. This preference is relative, and does not prevent the dispatch from overriding the preference to avoid starvation or other problems.

A monitoring process for a NUMA system collects data from multiple monitored threads executing in different nodes of the system. The monitoring process executes on different processors in different nodes. The monitoring process intelligently collects data from monitored threads according to the node it which it is executing to reduce the proportion of inter-node data accesses. Preferably, the monitoring process has the capability to specify a node to which it should be dispatched next to the dispatcher, and traverses the nodes while collecting data from threads associated with the node in which the monitor is currently executing. By intelligently associating the data collection with the node of the monitoring process, the frequency of inter-node data accesses for purposes of collecting data by the monitoring process is reduced, increasing execution efficiency.

According to some embodiments, a registry is displayed. The registry may, for example, indicate resources available from a plurality of remote network access devices via a communications network. Moreover, a personal network address may be associated with each available resource, the personal network address including an destination address portion and an application program identifier portion. A direct communications link may then be established between a first network access device hosting an available resource and a second network address device using the personal network address associated with the resource.

The invention provides a memory monitor method, a memory access controller and a SoC system and relates to the communication field. By means of the memory monitor method, the memory access controller and the SoC system, when abnormal memory access occurs, modules having illegal access to memory can be quickly and accurately positioned. The method comprises following steps: obtaining a memory access command (comprising an address of memory to be accessed, identification and read-write attributes of the memory access module) sent by a memory access module; obtaining a legal access condition corresponding to the memory address to be accessed, wherein the condition comprises at least one identification of a module, and at least one read or write authority owned by a module to the memory address to be accessed; determining whether the identification of the memory access module belongs to the at least one module identification and whether the read-write attributes accord with the read or write authorities; if the identification of the memory access module does not belong to the at least one module identification and/or the read-write attributes do not accord with the read or write authorities, recording the memory address to be accessed, the identification of the memory access module and the read-write attributes.

The invention provides a memory controller based on the burst disorder memory access dispatching, which is used to the burst disorder memory access dispatching accessed by a memory, and comprises a reading-writing queue module for storing the reading-writing memory access from a processor in a two-dimension mode, a block arbitration module for arbitrating a burst memory access from each block in each memory clock period, and an event selection module for selecting the final memory access operation from the burst of each block after arbitrated to send to the memory. The block is conducted with the burst arbitration to dispatch the disorder memory access through changing the structure of a queue and adopting the priority expression provided by the invention, thereby increasing the data bandwidth of the memory, and reducing the executing time of the processor.

The embodiment of the invention discloses a method and a device for threading a serial program in a nonuniform memory access system, which relates to the multi-thread technical field, and can alleviate the worsening of properties of a multi-nuclear processor caused by the access and memory delay difference when executing the serial program in the nonuniform memory access system. The method comprises the steps that: the serial program to be processed is received; information of a multi-nuclear processor is acquired, and the information comprises an internet structure information of the multi-nuclear processor and at least one item in the access and memory delay of each processor nuclear; a usable cycling part of the serial program is threaded into an inferred thread, and a serial part and an unusable cycling part of the serial program are threaded into a control thread; and the control thread and the inferred thread are allocated to the processor nuclear according to at least one of the internet structure information and the delay information. The method and the device are used for executing the serial program in a threading way in the nonuniform memory access system supporting an inferred multi-thread mechanism.

The invention provides a distributed virtual machine manager. The distributed virtual machine manager comprises a virtual machine management module and a client operating system. The virtual machine management module comprises a distributed sharing bus module and a distributed nonuniform memory access module operated on each physical machine node. Through the distributed sharing bus module and thedistributed nonuniform memory access module, uniform interfaces of mass resources are abstracted to a virtual machine to provide for an upper layer client operating system. The client operating system is used for the distributed nonuniform memory access module to realize a dNUMA-TSO model and NUMA affinity setting. Through the distributed virtual machine manager, heterogeneous resources on a plurality of physical machines are abstracted to the virtual machine through a virtualization polymerization technology, so as to provide mass resources for the client operating system which is operated on an upper layer, thereby satisfying application scenarios having ultrahigh resource and performance demands.

Systems and methods for efficiently processing data in a non-uniform memory access (NUMA) computing system are disclosed. A computing system includes multiple nodes connected in a NUMA configuration. Each node includes a processing unit which includes one or more processors. A processor in a processing unit executes an instruction that identifies an address corresponding to a data location. The processor determines whether a memory device stores data corresponding to the address. A response is returned to the processor. The response indicates whether the memory device stores data corresponding to the address. The processor completes processing of the instruction without retrieving the data.

The invention provides a directory cache method for a node control chip in a cache coherent non-uniform memory access (CC-NUMA) system. A directory cache module is designed for achieving and optimizing the access control of a memory. In researches and designs of computer architectures, locality of application program access is often considered, wherein the phenomenon that recently visited data are revisited before long is called temporal locality; and based on the characteristic, the cache is introduced in the CC-NUMA system based on a directory for caching directory entries, and a least recently used (LRU) replacement algorithm is utilized, so that visiting pressure of the directory is well reduced, and a bottleneck effect of the visiting of the memory is relieved.

The present invention discloses an efficient network I/O processing method based on the NUMA and the hardware assisted technology. The method is characterized in that in the virtualized environment, when an SRIOV (Single-Root I/O Virtualization) direct allocation device or a paravirtualization device generates a piece of physical interruption, by analyzing the CPU for processing the physical interruption, the target CPU and the node affinity of the NUMA (Non- Uniform Memory Access Architecture) where the underlying network card is located are interrupted; combined with the virtual CPU running information, interruption processing efficiency of the Intel APICv hardware technology and the Posted-Interrupt mechanism on the multi-core server is optimized; and under the condition that the context switching load caused by the VM-exit is fully reduced, all submission delays and call delays from generating interruption to processing interruption by the virtual machine are effectively eliminated, so that the I/O response rate of the virtual machine is greatly improved, and data packet processing efficiency of the data center network is greatly optimized.

The present invention discloses an apparatus and a method for virtual machine scheduling in a non-uniform memory access (NUMA) architecture. The method includes the following steps: obtaining, by a performance monitoring module, NUMA topology information of a host machine NUMA, and monitoring virtual machine performance events by using a kernel PMU; transmitting the NUMA topology information of the host machine NUMA and the virtual machine performance events to an algorithm implementation interface module; invoking, by the algorithm implementation interface module, an algorithm, and transmitting a scheduling decision that is obtained by using a scheduling algorithm to a virtual machine scheduling module after execution of the scheduling algorithm is complete; scheduling, by the virtual machine scheduling module according to the scheduling decision transmitted by the algorithm implementation interface module, a VCPU and a memory of a virtual machine; and after the scheduling of the virtual machine is complete, redirecting to continue performing performance monitoring of the virtual machine. According to the method of the present invention, only implementation of NUMA scheduling optimization algorithm needs to be considered, and there is no need to consider details, for example, collection of data such as information and performance of a virtual machine, and specific scheduling of the virtual machine, thereby greatly improving the research efficiency of a researcher.

A processor system tracks, in at least one counter, a number of cycles in which at least one execution unit of at least one processor core is idle and at least one thread of the at least one processor core is waiting on at least one off-core memory access during run-time of the at least one processor core during an interval comprising multiple cycles. The processor system evaluates an expected performance impact of a frequency change within the at least one processor core based on the current run-time conditions for executing at least one operation tracked in the at least one counter during the interval.

Apparatus, method, and system for enhancing data prefetching based on non-uniform memory access (NUMA) characteristics are described herein. An apparatus embodiment includes a system memory, a cache, and a prefetcher. The system memory includes multiple memory regions, at least some of which are associated with different NUMA characteristic (access latency, bandwidth, etc.) than others. Each region is associated with its own set of prefetch parameters that are set in accordance to their respective NUMA characteristics. The prefetcher monitors data accesses to the cache and generates one or more prefetch requests to fetch data from the system memory to the cache based on the monitored data accesses and the set of prefetch parameters associated with the memory region from which data is to be fetched. The set of prefetcher parameters may include prefetch distance, training-to-stable threshold, and throttle threshold.

The invention discloses a fine-granularity vCPU (Virtual Central Processing Unit) scheduling method and system oriented to NUMA (Non-Uniformed Memory Access) memory architecture. The method comprisesthe following steps that: in a vCPU execution process, detecting the internal state of the vCPU to identify a specific client process which operates in the vCPU; obtaining the memory access information of the vCPU in each execution period, endowing the client process which is operated in the vCPU with the memory access information in each execution period, wherein the memory access information isthe memory access counting of the client process for each NUMA node; according to the memory access information of the client in each execution period, determining the relationship node of the clientprocess in each execution period; comparing the true relationship node of the client process with a relationship node statistic result in a current vCPU period, determining whether the true relationship node of the client process is updated or not; and according to the true relationship node of the client process, determining the scheduling decision of the vCPU. According to the memory access characteristics of the client process which is practically operated in the vCPU, the scheduling of the vCPU is guided, and accuracy is high.