C++库研究笔记——Linux下是否需要使用memory pool？

最新推荐文章于 2025-03-19 07:52:38 发布

翻译最新推荐文章于 2025-03-19 07:52:38 发布 · 1.5k 阅读

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本文通过一系列测试对比了Linux中使用Slab分配器与不使用时的性能差异。结果显示，在多数情况下，使用Slab分配器能够带来约两倍的性能提升，尤其是在频繁的内存分配与释放操作中。

Linux Slab分配器(一)--概述

Linux slab 分配器剖析

C＋＋库研究笔记——内存池实现

做了一些测试：发现linux使用内存池与否没有明显差别，仅仅有2倍(这个很容易被计算覆盖掉）

Linux内存处理机制已经很好，一般情况下，确实没有必要在用内存池？？？不知道大家持什么样的观点。

速度测试：

In [use pool]:0.00560116768 seconds
In [ no pool]:0.00855708122 seconds

In [use pool]:0.00404405594 seconds
In [ no pool]:0.00921702385 seconds

In [use pool]:0.0060069561 seconds
In [ no pool]:0.0129909515 seconds

In [use pool]:0.00984287262 seconds
In [ no pool]:0.0179138184 seconds

In [use pool]:0.00937509537 seconds
In [ no pool]:0.0222010612 seconds

In [use pool]:0.0128059387 seconds
In [ no pool]:0.0269629955 seconds

In [use pool]:0.0170590878 seconds
In [ no pool]:0.0312800407 seconds

In [use pool]:0.0199379921 seconds
In [ no pool]:0.0355689526 seconds

In [use pool]:0.0220119953 seconds
In [ no pool]:0.0396490097 seconds

In [use pool]:0.0250389576 seconds
In [ no pool]:0.0438430309 seconds

02:36:16:~/../pool_test$ vim MainFile.cpp

g++ MemPool.o TestClass.o MainFile.cpp -o main -O3

Press ENTER or type command to continue
02:37:21:~/../pool_test$ ./main
In [use pool]:0.000194072723 seconds
In [ no pool]:0.000468015671 seconds

In [use pool]:0.000373125076 seconds
In [ no pool]:0.000900030136 seconds

In [use pool]:0.000594139099 seconds
In [ no pool]:0.00134897232 seconds

In [use pool]:0.000751018524 seconds
In [ no pool]:0.00190091133 seconds

In [use pool]:0.000940084457 seconds
In [ no pool]:0.0022559166 seconds

In [use pool]:0.00139307976 seconds
In [ no pool]:0.00420188904 seconds

In [use pool]:0.00148892403 seconds
In [ no pool]:0.00316882133 seconds

In [use pool]:0.00165891647 seconds
In [ no pool]:0.00361800194 seconds

In [use pool]:0.00178599358 seconds
In [ no pool]:0.00484013557 seconds

In [use pool]:0.0184268951 seconds
In [ no pool]:0.0416920185 seconds

In [use pool]:0.0186669827 seconds
In [ no pool]:0.043035984 seconds

In [use pool]:0.0192191601 seconds
In [ no pool]:0.0422170162 seconds

In [use pool]:0.0193469524 seconds
In [ no pool]:0.0423469543 seconds

In [use pool]:0.0193350315 seconds
In [ no pool]:0.0422008038 seconds

In [use pool]:0.0196199417 seconds
In [ no pool]:0.0431320667 seconds

In [use pool]:0.0197191238 seconds
In [ no pool]:0.0441551208 seconds

In [use pool]:0.0201468468 seconds
In [ no pool]:0.0435791016 seconds