[Qemu-devel] [Bug 601946] Re: [Feature request] qemu-img multi-threaded compressed image conversion

[Bernhard M. Wiedemann]

qcow2_write_compressed in block/qcow2.c would need to be changed. 
Currently it seems to need bigger changes as it always does compress+write for 
one block.
Not sure, how well it would handle multiple writes in parallel, so the safest 
would be to avoid that and just wait for the previous writer to finish before 
starting to write.

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https://bugs.launchpad.net/bugs/601946

Title:
  [Feature request] qemu-img multi-threaded compressed image conversion

Status in QEMU:
  New

Bug description:
  Feature request:
  qemu-img multi-threaded compressed image conversion

  Suppose I want to convert raw image to compressed qcow2. Multi-
  threaded conversion will be much faster, because bottleneck is
  compressing data.

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