On Fri, Sep 01, 2023 at 10:42:16AM +0100, Richard W.M. Jones wrote:
>   $ hyperfine 'nbdkit -U - --filter=qcow2dec file test.qcow2.XXX --run 
> '\''nbdcopy --request-size "$uri" test.out'\'' '

Sorry, copy and paste error, the command is:

hyperfine 'nbdkit -U - --filter=qcow2dec file test.qcow2.XXX --run '\''nbdcopy 
"$uri" test.out'\'' '

unless you want to adjust the --request-size parameter to fix
the scaling problem at the largest cluster size.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v
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