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concurrentmemorypool's Introduction

高并发内存池

项目主体结构

k2vVET.png

  • ThreadCache为个线程独有的对象，主要负责向线程提供所需要的内存块大小，ThreadCache直接与线程进行交互，当ThreadCache中没有可用的内存块时，ThreadCache就需要向下层的CentralCache申请内存块继续使用。
  • CentralCache在整个项目中仅有一个对象，CentralCache主要负责向各个线程中的ThreadCache合理分配内存块资源，当CentralCache中没有可用的内存块时，它就要继续向下层的PageCache申请内存块。
  • PageCache在整个项目中仅有一个对象，PageCache主要负责向系统申请一大块内存来向上分配。

ThreadCache

ThreadCache的结构

k2vnC4.png

Thread为各线程独有

如何控制各线程独有自己的ThreadCache？

  • 用链表链接所有的Threadcache 申请内存时 遍历链表寻找属于线程自己的ThreadCache
  • tls : 线程自己独有的全局变量，使用tls标记线程自己的threadCache

ThreadCache的接口

  • Allocate 申请空间
  • Deallocate 释放空间

CentralCache

CentralCache结构

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CentralCache有且仅有一个对象

如何控制CentralCache仅有为一对象?

  • 采用单例设计模式

CentralCache接口

  • FetchRangeObj 向ThreadCache分配内存块
  • GetOneSpan 获取一个Span
  • ReleaseListToSpans 向PageCache申请一段SpanList

PageCache

PageCache的结构

k2vlK1.png

PageCache仅有一个对象

如何控制PageCache仅有为一对象?

  • 采用单例模式设计PageCache类

PageCache接口

  • NewSpan(size_t npage) 获得一个新的Span

concurrentmemorypool's People

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