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2357 :: Jester: slow route affects other routes

• hendi (orginal) [2016-07-03T16:43:20+02:00] view original

  Hi,

  I'm using the following code:

  import jester, asyncdispatch
  import os
  
  routes:
    get "/slow":
      sleep(1000)
      resp "thanks for waiting"
    
    get "/fast":
      resp "whooosh"
  
  runForever()
  Run

  I can get hundreds of requests per seconds on the /fast route. But once I add requests to the /slow route (even just 1-2 per second) the performance of the /fast route drops as well. So the /slow route appears to block the whole server.

  How would I go about changing my code above to have the /slow route not affect the whole server?

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• Varriount (orginal) [2016-07-03T17:15:37+02:00] view original

  Jester relies on Nim's built-in async modules, which are unfortunately built on a single-threaded asynchronous approach. This means any blocking operation done on the main thread will stall all operations.

  If your aim is to pause a route, I suggest using something like sleepAsync. For operations that don't have an asynchronous version, you'll need to run the procedure on another thread.

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