HTTP请求中文件协议的使用

Question

使用HTTP Request is suggested for Passing variables between threads读取文件。

For example you could use the Save Responses to a file listener or perhaps a BeanShell PostProcessor in one thread, and read the file using the HTTP Sampler "file:" protocol, and extract the information using a PostProcessor

哪个有效，但应该忽略文档中的警告吗？

Note: the FILE protocol is intended for testing purposes only. It is handled by the same code regardless of which HTTP Sampler is used.

Is/when它safe/good练习使用文件协议还是deprecated/bad练习？

Answer 1

1. 使用 Beanshell PostProcessor 绝对是一种糟糕的做法，since JMeter 3.1 you should be using JSR223 Test Elements and Groovy 语言
2. 写入和读取文件可能会导致大量 disk IO 开销，这可能成为脚本的瓶颈，尤其是在高负载时。而且in-memory操作会比writing/reading文件to/from文件系统
快很多

假设以上所有：

虽然如果您需要从文件系统上的文件中读取数据，使用file协议没有任何问题，但最好避免使用这些临时文件并使用内存在线程之间传递数据，选项在：

1. 在其他Thread Group中使用__setProperty() function in 1st thread group to store the value and __P() function读取之前存储的值
2. 使用Inter-Thread Communication Plugin which can be used for passing variables between threads, even if they live in different Thread Groups (see SynchronizationExample.jmx for a practical use case). Inter-Thread Communication Plugin can be installed using JMeter Plugins Manager