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2596 :: How to use attatchment effectively in jester?

• shawnye (orginal) [2016-10-31T10:12:36+01:00] view original

  I write this code:

  
  get "/attachment":
      attachment "public/root/test.rar "
      resp readFile "public/root/test.rar "
  Run

  build on nim 0.15.2 , windows 7

  run started : memeory used: 744KiB

  test.rar is about 5.158MiB, after download :memeory used: 46.855MiB

  It's totally unacceptable.

  So my question is : how to use attatchment effectively or correctly in jester?

  Thank you!

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• Araq (orginal) [2016-11-01T08:10:45+01:00] view original

  It's certainly not good to use 50MB but does it keep growing or is it not a real leak?

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• shawnye (orginal) [2016-11-02T02:38:10+01:00] view original

  Yes, it keep growing if I download next file, it seems to be a leak, maybe readFile under async condition ? I really need help or have to give up towards golang. Thank you!

  
  import jester, asyncdispatch, htmlgen,strutils
  
  routes:
    get "/":
      resp h1("Hello world")
    
    get "/download":
      attachment  "public/root/test.rar"
      resp readFile "public/root/test.rar"
  
  runForever()
  Run

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• Araq (orginal) [2016-11-02T11:08:19+01:00] view original

  Does the leak disappear with --gc:markAndSweep or --gc:boehm?

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• shawnye (orginal) [2016-11-02T14:43:30+01:00] view original

  build with --gc:markAndSweep, nothing changed.

  build with --gc:boehm, error occurred:

  
  lib\pure\asyncdispatch.nim(198, 14) Error: undeclared identifier: 'ForeignCell'
  Run

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• Araq (orginal) [2016-11-02T17:01:49+01:00] view original

  Did you create a github issue for this? o.O

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• andrea (orginal) [2016-11-02T18:24:49+01:00] view original

  I see the same behaviour using Rosencrantz, hence I believe it is a bug in asyncfile.

  I tried using a ~50MB file, and the usage grows with every download. It stays bounded, though: at around 400MB the GC kicks in and the memory used never grows more than 500MB.

  For reference

  import asynchttpserver, asyncdispatch, rosencrantz
  
  let handler = get[
    path("/download")[
      file("test.tar.gz")
    ]
  ]
  let server = newAsyncHttpServer()
  
  waitFor server.serve(Port(8080), handler)
  Run

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