Gameenginearchitecture Reading Notes (3)

• memory management
  • C ++'s default new method is less efficient
  • If the algorithms are the same, a good memory management policy can also improve performance.
  • you can use pre-allocation to reduce the number of dynamic allocations (memory pool)
  • SIMD Math Library requires memory alignment (xnamath)
  • cache miss
    • CPU access to ram is slow, so there is a fast cache in the middle
    • when the CPU accesses data, it will copy a segment from Ram to the cache. If the cache is good enough, it will respond quickly. If not, it is necessary to re-load another segment to the cache
    • the cache miss cannot be avoided, but you can reduce the number of occurrences in the Program Policy
    • how to reduce data cache miss
      • try to organize your data in a continuous memory
      • each part should be as small as possible (bit domain operations can be used)
    • How to Reduce instruction cache miss
      • performance-related do not call functions in the Code section.
      • if you have to call a function, put the function in the same CPP.
      • use the inline function
  • if you are too lazy to do it yourself, you can use TBB or nedmalloc
• resource and File System
  • File System
    • we recommend that you use the "/" path separator and provide the path processing tool function class.
    • asynchronous Io should be supported at this layer
  • Resource Management
    • Version Control is best integrated into management tools
    • you can create a resource database for easy retrieval
    • The resource "compiler" allows you to perform resource format conversion and Optimization in this step.
    • file packaging can reduce the disk's seek time
    • resource data compression can be performed at the file package layer
    • serialization can be used to reduce file format confusion, but C ++ lacks this feature.