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  • Hardware prefetch and shared multi-core resources on Xeon
    This prefetcher, also known as the streaming prefetcher, is triggered by an ascending access to very recently loaded data The processor assumes that this access is part of a streaming algorithm and automatically fetches the next line • Instruction pointer (IP)-based stride prefetcher This prefetcher keeps track of individual load instructions
  • disabling hardware prefetching on Xeon - Intel Communities
    Hi, I was trying to do some experiments tounderstand the effect of hardware prefetcher on software prefetching I had a question related to h w prefetcher on Intel Xeon processor,and was wondering if any of you have some suggestions My machine configuration: $ uname -a Linux 2 6 34-gentoo-r1 #2 SM
  • Disabling HW prefetcher - Intel Community
    back to the question, still I want to finish the code for my own purposes to learn somethings I want to evaluate different prefetcher methods for data structures So, for a simple case, I have an array and want to first check and measure the latencies of array[0] and array[20] Also, my previous post has not been answered
  • MSGDMA Prefetcher Initialization Error - Intel Community
    Hello, We have a custom hardware solution using Cyclone IV This is an old design using Quartus 12 0 We're planning to transition to an Arria 10 with a SoC and therefore we are preparing our design and software to be compatible with Quartus 20 1 First we could not get the SGDMA to work properly an
  • How to control the four hardware prefetchers in L1 and L2 more flexibly . . .
    1 Does L1 Icache itself have prefetcher? (I know ip and nextline is associated to L1 Dcache) Does TLB have prefetcher? 2 What trigger the prefetchers to work, miss or access? 3 As we all know, many academic prefetch papers used the concept of "prefetch degree" and "prefetch distance" Are there also such parameters in Intel prefetchers?
  • The L1 hardware prefetcher - Page 2 - Intel Community
    The L1 hardware prefetcher might generate a prefetch for the next line after seen loads to array[30] and array[33] (note 1), but the L2 hardware prefetcher won't generate prefetches until it sees two fetches to the same 4KiB page The load to array[70] is the second access to the page, so I expect
  • Why behavior of L2 adjacent line prefetcher are different in Core2Duo . . .
    I have performed the above experiments in both of my Intel(R) Core2Duo @2 20GHz and Intel(R) Core(TM) i7-3770 CPU @ 3 40GHz with ONLY L2 adjacent line prefetcher enabled ( all other prefetcher disabled) Here is my results In Core2Duo system, 32 cache lines ( i+1or i-1 of step1a) are prefetched which indicates adjacent cache line always
  • Disabling Prefetching on the i5 - Intel Community
    So to me it seems I'm getting some next line prefetcher activated or a streaming prefetch into the L1D because of 3 or more consecutive accesses to the same line Any feedback anyone on this There's no public documentation about the HW prefetch hit and miss rates in the SB IB arch unfortunately and they don't seem to be entirely reliable if you use those from NH, which I do
  • Are there any ways that can control prefetcher flexibly?
    There are some knobs that can control the prefetcher behavior in BIOS control panel The prefetchers can be controlled with register written as well But the way to control prefetchers is only switching on off Prefetching stragedy can be determined flexibly with two variables: prefetching distance and degree
  • How does the next PAGE hardware prefetcher (NPP) work?
    L2 L3 hardware prefetcher behaviors [are well documented (their aggressiveness, their tiggers, etc)][1] However, very little is known about the next-page prefetcher that supposedly pre-loads the TLB when access patterns are sequential Other than this [Intel forum discussion][2], I have not been able to find anything of significance





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