CODEWITHSUNDEEP
netty
M.I
M.I

Reputation: 303

Netty - Specifying the number of thread to create

Let me ask several questions regarding thread with Netty.

Q1. Which thread is created? According to documentation, following constructor creates multiple threads (2 * the number of avail processors). It means that it creates multiple boss threads or worker threads? My assumption is 1 boss thread and multiple worker thread. Am I correct?

public NioServerSocketChannelFactory(Executor bossExecutor, Executor workerExecutor) Creates a new instance. Calling this constructor is same with calling NioServerSocketChannelFactory(Executor, Executor, int) with 2 * the number of available processors in the machine.

Q2. According to the documentation, it seems to me that I can specify the max number of worker thread with following constructor. Can I implicitly specify exact number of worker thread to create - say 16?

public NioServerSocketChannelFactory(Executor bossExecutor, Executor workerExecutor, int workerCount) Creates a new instance. Parameters: bossExecutor - the Executor which will execute the boss threads workerExecutor - the Executor which will execute the I/O worker threads workerCount - the maximum number of I/O worker threads

Q3. Is there any way to know the number of boss and worker threads that currently run?

Any help is greatly appreciated!

Upvotes: 4

Views: 2905

Answers (1)

trustin
trustin

Reputation: 12351

Q1. Which thread is created? According to documentation, following constructor creates multiple threads (2 * the number of avail processors). It means that it creates multiple boss threads or worker threads? My assumption is 1 boss thread and multiple worker thread. Am I correct?

Yes.

Q2. According to the documentation, it seems to me that I can specify the max number of worker thread with following constructor. Can I implicitly specify exact number of worker thread to create - say 16?

Just specify Executors.newCachedThreadPool() and specify the max number of threads to use as a constructor parameter.

Q3. Is there any way to know the number of boss and worker threads that currently run?

You can get it via ThreadPoolExecutor.getActiveCount() assuming you passed Executors.newCachedThreadPool(). It returns ThreadPoolExecutor, so you can keep it somewhere and then query it to see how many threads are actually active.

Upvotes: 3

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