The difference between jmeter concurrency and thread number

1. Concurrency: refers to the number of connections accessing the server site at the same time.

2. Number of threads: It is a single sequential control process in a program. Running multiple threads in a program to complete different tasks at the same time is called multithreading.

Second, the principle is different.

1. concurrency: based on multiple users per server, that is, multiple users * * * use the same server. In order to avoid too many IIS links of one user on the same server or taking up too many server resources, it will affect the normal use of other users.

2. Number of threads: the server transmits data to the client, and the client and the server are compared to two small islands. The number of threads is compared to a bridge connecting two small islands. The more bridges are built, the more data will be transmitted per unit time. However, if the number of bridges exceeds the capacity of both parties, the client will not be able to accept data from other servers.

Third, the characteristics are different.

1, number of concurrency: the default timeout of a link by the server is generally 15-20 minutes, that is, when a visiting user visits your webpage and closes it, it usually takes the server 15-20 minutes to clear it from the memory, which is regarded as an invalid link.

2. Number of threads: users can modify the original number of downloaded threads according to different server restrictions. Depending on the popularity of downloaded resources and the number of candidate resources, the number of threads available for downloading this task will be different.

Baidu encyclopedia-number of threads

Baidu Encyclopedia-Concurrent Number