Hi all and @Marvin, has any one tried running concurrent flows with prefect 2.x? I am able to run concurrent tasks using

async

and

asyncio.gather

but I am not able to get flows to run concurrently. Any suggestions?

Running concurrent flows in Prefect 2.x is a bit different from running concurrent tasks. While tasks can be managed with

async

and

asyncio.gather

, flows are higher-level constructs and their concurrency is managed by Prefect's orchestration layer. To run multiple flows concurrently, you can utilize Prefect's work queues and concurrency limits. Here's a general approach: 1. Work Queues and Concurrency Limits: You can define work queues with different concurrency limits to control how many flow runs can be executed concurrently. For example, you can create queues with different priorities and concurrency limits to manage the execution order and concurrency of your flows. Learn more about work queues. 2. Flow Definition and Execution: Flows in Prefect are defined as Python functions decorated with

@flow

. These functions can encapsulate tasks and orchestrate their execution. While Prefect does not natively support running multiple flows concurrently in the same process, you can schedule them to run concurrently in separate processes or environments using Prefect's scheduling capabilities. Learn more about flows. 3. Prefect API: You can use Prefect's API to manage flow runs, including pausing, resuming, and suspending flows if needed. This can be useful for orchestrating complex workflows where certain flows need to wait for others to complete. If you're looking to run flows in a truly concurrent manner, consider deploying them in a distributed environment where Prefect can manage the execution across multiple workers or agents. For your specific use case, you might need to explore Prefect's deployment and scheduling features to achieve the level of concurrency you desire. If you have more specific requirements or constraints, feel free to share them!

@Marvin, can you run concurrent flows with prefect 3.x?

In Prefect 3.x, running concurrent flows is managed through work pools and concurrency limits, similar to Prefect 2.x. Here are some key points to consider: 1. Work Pools and Concurrency Limits: You can define work pools with specific concurrency limits to control how many flows can run concurrently. This allows you to manage resources and prioritize flow execution effectively. Read more about work pools and concurrency. 2. Flow Execution: Flows in Prefect 3.x are executed using workers, which replace the agents from Prefect 2.x. You can deploy flows and manage their execution using Prefect's deployment and scheduling features. 3. Concurrency Handling: While Prefect itself orchestrates flow execution, you can specify priorities and concurrency limits to ensure that flows run concurrently up to the specified limits. This is useful in distributed environments where Prefect manages multiple workers. 4. Prefect API and Deployment: Prefect 3.x offers a more refined API for managing deployments. You can trigger deployments and manage their execution through the Prefect UI or CLI, allowing for more flexible orchestration of concurrent flows. For more detailed information, you might want to explore the Prefect 3.x documentation on deployments and work pools. If you have specific requirements or constraints, feel free to share them!