Netty | rectify thread model
Two common business scenarios
- CPU-intensive: computing type;
- IO-intensive: waiting type, such as relying on other microservices and databases;
CPU intensive
- Keep the current thread model and reuse the threads bound in NioEventLoop;
- In the current thread model, the number of threads bound in NioEventLoop: Runtime.getRuntime().availableProcessors() * 2;
- Considering the Docker situation, you can set a parameter io.netty.availableProcessors, and then set the number of threads to io.netty.availableProcessors * 2;
- When tuning, you can directly set the parameter io.netty.eventLoopThreads to set the number of threads bound in NioEventLoop;
IO intensive
- Rectify the thread model, and independently create a "thread pool" to handle business;
- Method 1: Use JDK Executors in the handler;
- Method 2: When adding a handler, specify an EventExecutorGroup, code example:
EventExecutorGroup eventExecutorGroup = new UnorderedThreadPoolEventExecutor(10);
pipeline.addLast(eventExecutorGroup, serverHandler);
Why is NioEventLoopGroup not used in the sample code of Method 2?
- When the parameter SINGLE_EVENTEXECUTOR_PER_GROUP is set to true, the code in the Handler will only be executed in one thread in the NioEventLoopGroup, so it is single-threaded, and requests have to be queued and waited;
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