优化压测时部分命令慢的问题,提升性能

[earl86]

Description

优化压测时部分命令慢的问题,提升性能

Motivation and Context

std::stringstream 字符串拼接效率较低,在高并发下存在性能问题. 改为 std::string 类型拼接,提升效率.

How Has This Been Tested?

压测及使用时未发现异常

Types of Changes

• [ ] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] Code follows the code style of this project.
• [ ] Change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.