Can workerman be executed in multiple processes?

#In order to give full play to the performance of the server's multi-CPU, WorkerMan supports multi-process and multi-tasking by default.

WorkerMan starts a main process and multiple sub-processes to provide external services. The main process is responsible for monitoring the sub-processes. The sub-processes independently monitor network connections and receive, send and process data. Due to the simple process model, Making WorkerMan more stable and efficient. (Recommended learning: workerman tutorial)

Create a main process (daemon process). Once started, it will run in the background for a long time, even if it is shut down. Drop the browser page.

The main thread regularly queries the database (MySQL). Once it finds a URL that meets the conditions (there may be multiple URLs), it creates the corresponding number of child processes.

The child process also needs to exist for a long time, and periodically polls the server corresponding to the URL to retrieve data.

Once the child process retrieves the required data, it will save the results to the database and end itself (or be closed by the main process) ).

Principles for setting the number of processes

1. The sum of the memory occupied by each process needs to be less than the total memory (generally speaking, each business process occupies about 40M of memory) )

2. If it is IO-intensive, that is, the business involves some blocking IO, such as general access to Mysql, Redis and other storages are blocking access, the number of processes can be increased, such as Configure to 3 times the number of CPU cores.

If there is a lot of blocking and waiting involved in the business, you can increase the number of processes appropriately, for example, 5 times the number of CPU cores or even higher. Note that non-blocking IO is CPU-intensive, not IO-intensive.

3. If it is CPU-intensive, that is, there is no blocking IO overhead in the business. For example, if asynchronous IO is used to read network resources and the process will not be blocked by the business code, the number of processes can be set to Same as CPU core number

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