166results about How to "Reduce contention" patented technology

The invention provides improved devices for processing data from one or more physiological sensors based on parallel processing. The provided devices are small, low power, and readily configurable for use in most physiological monitoring applications. In a preferred embodiment, the provided devices are used for ambulatory monitoring of a subject's cardio-respiratory systems, and in particular, process data from one or more respiratory inductive plethysmographic sensors.

Methods and systems for enhanced computer performance improve software application execution in a computer system using, for example, a symmetrical multi-processing operating system including OS kernel services in kernel space of main memory, by using groups of related applications isolated areas in user space, such as containers, and using a reduced set of application group specific set of resource management services stored with each application group in user space, rather than the OS kernel facilities in kernel space, to manage shared resources during execution of an application, process or thread from that group. The reduced sets of resource management services may be optimized for the group stored therewith. Execution of each group may be exclusive to a different core of a multi-core processor and multiple groups may therefore execute separately and simultaneously on the different cores.

A system and method for peer-to-peer communications in cellular communications systems are provided. A method for communications device operations includes receiving a peer list at a communications device, where the peer list includes a list of reachable communications devices and device-to-device (D2D) capability information of the reachable communications devices, selecting a peer from the peer list, sending a content request comprising an indication of a content to a communications controller serving the communications device, and receiving the content from the peer over a channel established by the communications controller.

A wireless network communication method and apparatus for enhancing a data transfer rate by using a direct link protocol (DLP) and multi channels during a point coordination function (PCF) period in wireless network communications in which an access point is employed in an infrastructure mode using both a contention-free period and a contention period. The wireless network communication method of the present invention including transmitting/receiving data among stations supporting a direct link, during a given duration, through the direct link using an independent channel; transmitting/receiving data among stations other than the stations supporting the direct link, during the duration, in a specific mode corresponding to the contention-free or contention period; switching the DLP stations to a primary channel after the given duration; and transmitting/receiving data among all stations including the DLP stations, during the remaining duration, in a specific mode corresponding to the contention-free or contention period.

An access method for periodic contention-free sessions (PCFS) reduces interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations and an access point (AP) station. The access method for periodic contention-free sessions (PCFS) includes a fixed cycle time that reduces conflicts with PCFS from other cells. The PCFS from several cells are repeated in cycles of cycle period (CP), which is the contention-free period (CFP) of an access point times a factor that is a function of the number of overlapping cells. Periodic contention-free sessions (PCFSs) are generated, one from each overlapping cell. PCFS transmission attempts occur at the fixed specified time spacing following the start of the previous cycle. Each active AP sets a timer at CP and a PCFS is initiated when the timer expires. The timer is then reset to CP and this starts a new cycle. Contention transmissions are attempted by stations based on their assigned priority. If a channel is busy at the designated start time for transmitting a PCFS, the PCFS is shortened by the time lost. Interleaving PCFSs and CFSs reduces conflicts with CFSs from other cells. To lessen the contention between APs of different cells, each station's Network Allocation Vector (NAV) and Inter-BSS Network Allocation Vector (IBNAV) is updated by an increased value of the next CFS length, the increment being the inter-BSS contention period (IBCP). APs will attempt to access the channel during the IBCP only for transmitting a PCFS, while they will wait for the NAV and IBNAV expirations before attempting to transmit a CFS. Interleaving PCFSs and CFSs also enables maintaining quality of service (QoS).

A computer program product, an apparatus, and a method for reducing reserved device access contention at a control unit in communication with a plurality of operating systems via one or more channels are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method that includes receiving a command message at the control unit from a first operating system, including an I/O operation command for a device. A device busy indicator is received, indicating that a second operating system has reserved the device. The command message is queued on a device busy queue in response to the device busy indicator. The control unit monitors for a device end indicator. The device busy queue is serviced to perform the I/O operation command in response to the device end indicator.

Channel reservation systems and methods are disclosed herein, which schedule transmissions on a shared radio medium that is shared by a plurality of licensed network operators. In embodiments, priority access is pre-assigned to the network and the method determines whether to send a transmission based at least on the transmitter's priority class as compared to another transmitter's priority class and to which transmitter the time slot of a signal is dedicated. In embodiments, priority access may not be preassigned to the network and pre-grants may be used in conjunction with CR-Ts and CR-Rs to determine whether a transmitter transmits.

A task management methodology for system having multiple processors and task queues adapts a queuing topology by monitoring a queue pressure and adjusting the queue topology from a selection of at least two different queue topologies. The queue pressure may be periodically monitored and queues with different granularities selected. The methodology reduced contention when there is high pressure on the queues while also reducing overhead to manage queues when there is less pressure on the queues.

Systems and methods are provided using common-mode-voltage bias circuitry to make common-mode-voltage adjustments to differential driver circuitry in integrated circuit differential communications links. Adjustable bias circuitry may be controlled using static and dynamic control signals. Dynamic control signals can be produced by core logic on a programmable logic device or other integrated circuit. Static control signals can be produced by programmable elements. Bias circuit adjustments made at one end of a differential link can be used to improve performance at either end of the link or can be used to improve power consumption or to balance power and performance considerations. The same integrated circuit design can be used in both AC-coupled and DC-coupled environments. The bias circuitry can be formed from an adjustable current source and adjustable resistor. The current source and adjustable resistors can be controlled by the same control signals.

Methods and apparatus are provided for managing data in a hierarchal storage subsystem. A plurality of volumes is designated as a storage group for Level 0 storage; a high threshold is established for the storage group; space is allocated for a data set to a volume of the storage group, storing the data set to the volume; the high threshold is compared with a total amount of space consumed by all data sets stored to volumes in the storage group; and data sets are migrated from the storage group to a Level 1 storage if the high threshold is less than or equal to the total amount of space used by all of the data sets stored to volumes in the storage group. Optionally, high threshold are assigned to each storage group and, when the space used in a storage group reaches or exceeds the high threshold, migration of data will begin from volumes in the storage group, beginning with the volume having the least free space. Thus, contention between migration and space allocation is reduced. Also optionally, when a volume is selected for migration, a flag is set which prevents space in the volume from being allocated to new data sets. Upon completion of the migration, the flag is cleared and allocation is allowed. Thus, contention between migration and space allocation is avoided.

An improved arbiter is described for arbitrating requests by a plurality of first data processing units for access to a plurality of second data processing units interconnected by a switching system of a type in which at any time each first unit can only access one second unit and each second unit can only be accessed by one first unit. The arbiter comprises a scheduler mechanism for repeatedly selecting access requests with a defined minimum probability of selecting a request for each first unit-second unit combination. Rearrangement storage means records requests selected by the scheduler mechanism. A rearranger is provided for repeatedly selecting a set of requests recorded in the rearrangement storage means, so that only one request per first unit and per second unit is selected, using a priority mechanism which increases the probability of selection with the length of time a request is stored in the rearrangement storage means. Finally, means are provided for communicating the grant of the selected set of requests to the switching system and for deleting the selected set of requests from the rearrangement storage means. In one embodiment, the arbiter is used for controlling switching paths in a packet data switch.

A massively parallel computer system contains an inter-nodal communications network of node-to-node links. An automated routing strategy routes packets through one or more intermediate nodes of the network to reach a final destination. The default routing strategy is altered responsive to detection of overutilization of a particular path of one or more links, and at least some traffic is re-routed by distributing the traffic among multiple paths (which may include the default path). An alternative path may require a greater number of link traversals to reach the destination node.

Method and apparatus for building large memory-resident hash tables on general purpose processors. The hash table is broken into bands that are small enough to fit within the processor cache. A log is associated with each band and updates to the hash table are written to the appropriate memory-resident log rather than being directly applied to the hash table. When a log is sufficiently full, updates from the log are applied to the hash table insuring good cache reuse by virtue of false sharing of cache lines. Despite the increased overhead in writing and reading the logs, overall performance is improved due to improved cache line reuse.

The multiprocessing apparatus of the present invention is a multiprocessing apparatus including a plurality of processors, a shared bus, and a shared bus controller, wherein each of the processors includes a central processing unit (CPU) and a local cache, each of the local caches includes a cache memory, and a cache control unit that controls the cache memory, each of the cache control units includes a data coherence management unit that manages data coherence between the local caches by controlling data transfer carried out, via the shared bus, between the local caches, wherein at least one of the cache control units (a) monitors a local cache access signal, outputted from another one of the processors, for notifying an occurrence of a cache miss, and (b) notifies pseudo information to the another one of the processors via the shared bus controller, the pseudo information indicating that data corresponding to the local cache access signal is stored in the cache memory of the local cache that includes the at least one of the cache control units, even in the case where the data corresponding to the local cache access signal is not actually stored.