====== 1.cpu相关 ======
    - 限制cpu速度的最大因素是内存传输速度，称为冯诺依曼瓶颈
    - 为了解决内存的问题使用缓存的方式，一级、二级、三级缓存。一级缓存最快，达到或接近处理器时钟速度；二级缓存次之三级最慢，缓存占据了cpu30%的空间面积
    - 预取，将可能用到的互数据预读放到缓存区
    - 多线程技术，当一个线程遇到处于数据等待的时候，切换到其他准备好的线程执行
====== 2.gpu相关 ======
===== 2.1gpu结构图 =====
{{:cg:gpuarc.png|}}
===== 2.1.gpu参数 =====
  设备名称:GeForce GT 755M
  全局可用内存:1024MB(totalGlobalMem)
  每线程块可用共享内存:48KB(sharedMemPerBlock)
  每SM可用共享内存:48KB(sharedMemPerMultiprocessor)
  每SM可用32位寄存器个数:65536(regsPerMultiprocessor)
  每线程块可用32位寄存器个数:65536(regsPerBlock)
  线程束中线程容量:32(warpSize)
  最大内存复制步长:2147483647(memPitch)
  每线程块最大线程数:1024(maxThreadsPerBlock)
  线程块维度的最大值:1024,1024,64(maxThreadsDim)
  网格维度的最大值:2147483647,65535,65535(maxGridSize)
  时钟频率:1.034737GHZ(clockRate)
  可用常量内存:64KB(totalConstMem)
  主计算能力:3(major)
  次计算能力:0(minor)
  纹理对齐要求:false(textureAlignment)
  内存峰值时钟频率:2.384186GHZ(memoryClockRate)
  全局内存总线宽度:128(memoryBusWidth)
  支持一级缓存:true(localL1CacheSupported)
  二级缓存大小:256KB(l2CacheSize)
  处理器簇数量:2(multiProcessorCount)
  每个处理器簇最大驻留线程数:2048(maxThreadsPerMultiProcessor)
  处理器簇数量Multiprocessors( 2), 每个Sm拥有的核心数CUDA Cores/SP(192),总的CUDA Cores(384)
  
  CUDA Capability Major/Minor version number:    3.0
  Total amount of global memory:                 1024 MBytes (1073741824 bytes)
  ( 2) Multiprocessors, (192) CUDA Cores/MP:     384 CUDA Cores
  GPU Max Clock rate:                            1085 MHz (1.09 GHz)
  Memory Clock rate:                             2500 Mhz
  Memory Bus Width:                              128-bit
  L2 Cache Size:                                 262144 bytes
  Maximum Texture Dimension Size (x,y,z)         1D=(65536), 2D=(65536, 65536), 3D=(4096, 4096, 4096)
  Maximum Layered 1D Texture Size, (num) layers  1D=(16384), 2048 layers
  Maximum Layered 2D Texture Size, (num) layers  2D=(16384, 16384), 2048 layers
  Total amount of constant memory:               65536 bytes
  Total amount of shared memory per block:       49152 bytes
  Total number of registers available per block: 65536
  Warp size:                                     32
  Maximum number of threads per multiprocessor:  2048
  Maximum number of threads per block:           1024
  Max dimension size of a thread block (x,y,z): (1024, 1024, 64)
  Max dimension size of a grid size    (x,y,z): (2147483647, 65535, 65535)
  Maximum memory pitch:                          2147483647 bytes
  Texture alignment:                             512 bytes
  Concurrent copy and kernel execution:          Yes with 1 copy engine(s)
  Run time limit on kernels:                     Yes
  Integrated GPU sharing Host Memory:            No
  Support host page-locked memory mapping:       Yes
  Alignment requirement for Surfaces:            Yes
  Device has ECC support:                        Disabled
  CUDA Device Driver Mode (TCC or WDDM):         WDDM (Windows Display Driver Model)
  Device supports Unified Addressing (UVA):      Yes
  Device supports Compute Preemption:            No
  Supports Cooperative Kernel Launch:            No
  Supports MultiDevice Co-op Kernel Launch:      No
  Device PCI Domain ID / Bus ID / location ID:   0 / 1 / 0