TCP server document update

Author: HFrost0

README.md

@@ -3,6 +3,11 @@
 A tiny python asyncio just for learning 🙋‍♂️, document below is my personal notes during the learning, may change
 frequently.
 
+## TCP Echo Servers
+
+I implement a series of TCP echo server for the test of tiny-asyncio client including multi threading, IO multiplexing
+and so on. Details can be found [here](https://github.com/HFrost0/tiny-asyncio/tree/master/echo).
+
 ## Event Loop
 
 Event loop is just a `while True` loop, the basic functionality of event loop is to keep find out which functions can

echo/README.md

@@ -26,4 +26,41 @@ response.
 
 ### 6. threadpool
 
-Main thread for listening new connection, and a threadpool will be used to execute the response callbacks.
+Main thread for listening new connection, and a threadpool will be used to execute the response callbacks.
+
+## Performances
+
+Setup: all the results are obtained on macOS 12.4 M1 8 core chip laptop. selector_process server will have 4 worker
+processes, and threadpool server will have a default `ThreadPoolExecutor` without worker number arg.
+
+### 1k
+
+1000 client connect and then each one send 100 times.
+
+|         | select | selectors | selectors_process | thread  | threadpool |
+|---------|--------|-----------|-------------------|---------|------------|
+| connect | 0.2328 | 0.0427    | 0.0487            | 0.2784  | 0.0424     |
+| echo    | 1.2135 | 1.2332    | 1.3918            | 24.4581 | 1.5212     |
+
+### 10k
+
+10,000 client connect and then each one send 100 times
+
+|         | select | selectors | selectors_process | thread | threadpool |
+|---------|--------|-----------|-------------------|--------|------------|
+| connect | ❌      | 0.4142    | 0.4698            | ❌      | 0.4155     |
+| echo    | ❌      | 16.2907   | 19.7788           | ❌      | 16.1532    |
+
+* select server failed because of the limit of maximum 1024 fd number of `select`.
+* thread server failed because of too many thread created.
+
+### 10k + cpu
+
+10,000 client connect and then each one send 1 times, but server side is slow down by the cpu bound
+task `sum(range(100000))`.
+
+|         | select | selectors | selectors_process | thread | threadpool |
+|---------|--------|-----------|-------------------|--------|------------|
+| connect | ❌      | 0.7029    | 0.5843            | ❌      | 0.5510     |
+| echo    | ❌      | 9.2716    | 2.9143            | ❌      | 9.9059     |
+