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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-3

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https://bugs.launchpad.net/bugs/1181895

Title:
  Need fix performance  issue  during spawn with powervm driver

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  nova-compute is single threaded , and  powervm driver will caculate
  image file's checksum ,then ftp the image to the IVM, maybe need
  compress and decompress the image file . In this situation , nova-
  compute can't process any other work .

  The following is suggestion from libvirt developer :
  "We have code similar to this in libvirt, and people complain about it all the time. The big problem is that if an image is large, nova-compute is going to lock up calculating this checksum. Because nova-compute is single threaded, you wont process any other work while performing this calculation.
  I wonder if you should add some time.sleep(0) calls? This would act as a yield of the thread for eventlet."

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