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    • 1. 发明申请
    • Online Computation of Cache Occupancy and Performance
    • 缓存占用率和性能的在线计算
    • US20100095300A1
    • 2010-04-15
    • US12251108
    • 2008-10-14
    • Richard WestPuneet ZarooCarl A. WaldspurgerXiao ZhangHaoqiang Zheng
    • Richard WestPuneet ZarooCarl A. WaldspurgerXiao ZhangHaoqiang Zheng
    • G06F9/50G06F9/46
    • G06F9/50G06F9/5005G06F9/5011G06F9/5016G06F9/5022G06F9/5027G06F9/5033G06F9/5044G06F9/505G06F9/5055G06F11/3409G06F11/3442G06F11/3452G06F11/3466G06F12/08G06F12/0802G06F12/0804G06F12/0806G06F12/0815G06F12/084G06F2201/88
    • Methods, computer programs, and systems for managing thread performance in a computing environment based on cache occupancy are provided. In one embodiment, a computer implemented method assigns a thread performance counter to threads being created to measure the number of cache misses for the threads. The thread performance counter is deduced in one embodiment based on performance counters associated with each core in a processor. The method further calculates a self-thread value as the change in the thread performance counter of a given thread during a predetermined period, and an other-thread value as the sum of all the changes in the thread performance counters for all threads except for the given thread. Further, the method estimates a cache occupancy for the given thread based on a previous occupancy for the given thread, and the calculated shelf-thread and other-thread values. The estimated cache occupancy is used to assign computing environment resources to the given thread. In another embodiment, cache miss-rate curves are constructed for a thread to help analyze performance tradeoffs when changing cache allocations of the threads in the system.
    • 提供了基于缓存占用的用于在计算环境中管理线程性能的方法,计算机程序和系统。 在一个实施例中,计算机实现的方法为正在创建的线程分配线程性能计数器以测量线程的高速缓存未命中的数量。 基于与处理器中的每个核心相关联的性能计数器,在一个实施例中推导出线程性能计数器。 该方法进一步计算自线程值作为在预定时段期间给定线程的线程性能计数器的变化,而另一线程值作为所有线程的线程性能计数器的所有变化之和除外 给线程 此外,该方法基于给定线程的先前占用以及所计算的架线和其他线程值来估计给定线程的高速缓存占用。 估计的高速缓存占用率用于将计算环境资源分配给给定的线程。 在另一个实施例中,为线程构建高速缓存未命中率曲线,以帮助在改变系统中的线程的高速缓存分配时分析性能权衡。
    • 9. 发明授权
    • Plasma arc welding method
    • 等离子弧焊法
    • US4023006A
    • 1977-05-10
    • US533174
    • 1974-12-16
    • Richard WestDonald Leslie Amos Weston
    • Richard WestDonald Leslie Amos Weston
    • B23K10/00B23K9/16B23K9/10H01J7/24
    • B23K10/006
    • A method of operating a plasma welding apparatus producing a plasma arc and having valve means arranged to control gas flow for the plasma arc and power supply means arranged to control welding current for the plasma arc, wherein the plasma arc current, gas flow to the plasma arc and the feed of a filler material to the arc are coordinated for producing a weld. The gas flow and welding current are maintained at a steady rate during the weld run. The gas flow is reduced at a constant rate to a minimum valve of about 30 % of the steady flow rate at the conclusion of the welding run and the welding current is subsequently reduced at a constant rate from the steady value of the welding current. At the start of the weld run, the gas flow is initiated at a rate of about 50 % of the steady flow rate, the plasma arc current is initiated and is increased at a constant rate to the steady value from an initial value sufficient to strike the arc and the gas flow is increased at a constant flow rate to the steady flow rate as soon as the plasma arc has established a keyhole. The feed of filler material is at a constant rate and is initiated immediately before the plasma arc has established the keyhole and continued until the welding current decreases by substantially 20 % from its steady value.
    • 一种操作产生等离子体电弧的等离子体焊接装置的方法,具有设置成控制用于等离子体电弧和供电装置的气流的阀装置,该等离子焊接装置被布置成控制等离子体电弧的焊接电流,其中等离子弧电流,等离子体中的气体流 将电弧和填充材料进给到电弧进行协调以产生焊接。 在焊接运行期间,气流和焊接电流保持稳定。 在焊接运行结束时,气体流量以恒定速率减小到约30%的稳定流量的最小阀,并且焊接电流随后以恒定的速率从焊接电流的稳定值减小。 在焊接运行开始时,气体流量以稳定流速的约50%的速率启动,等离子体电弧电流被启动,并以恒定的速率增加到从足以触发的初始值的稳定值 一旦等离子体电弧建立了键孔,电弧和气体流量就以恒定的流量增加到稳定的流量。 填充材料的进料为恒定速率,并且在等离子体电弧已经建立了钥匙孔之前立即开始,并持续到焊接电流从其稳定值下降大约20%。