A common problem we face is deadlock. This is a situation where two (or more) processes block each other and wait for the other to perform a certain action that serves another and vice versa. The mpi4py module doesn't provide any specific functionality to resolve the deadlock problem, but there are some measures that the developer must follow in order to avoid the problem of deadlock.
Avoiding deadlock problems
How to do it...
Let's first analyze the following Python code, which will introduce a typical deadlock problem. We have two processes—rank equal to 1 and rank equal to 5—that communicate with each other and both have the data sender and data receiver functionalities:
- Import the mpi4py library: