Does JMeter pool HTTP connections?

Question

I know when using the built-in Java HTTP client in a JMeter HTTP Request sampler connections may or may not be pooled, depending on the JVM implementation and c

Answer 1

JMeter does some pooling of HTTP connections when using HttpClient3.1 or HttpClient4.

In both cases, connections are pooled per-thread. Connections are NOT shared across threads.

When using HttpClient3.1, JMeter uses an instance of SimpleHttpConnectionManager on each thread.

When using HttpClient4, JMeter uses an instance of a subclass of PoolingClientConnectionManager on each thread, and it uses PoolingClientConnectonManager's default settings (2 connections per route, and 20 maximum connections).

JMeter does not provide a mechanism for controlling the parameters of the connection pools.

I had to go to JMeter's source code to find this answer. See the following links for reference (the 2.13 tagged code):

• HTTPHC3Impl.java
• HTTPHC4Impl.java
• MeasuringConnectionManager.java

Note: this answer is accurate for JMeter 2.13. The answer may be different for other versions of JMeter.