[Libguestfs] Virt-v2v performance benchmarking part 3

Part 1: https://listman.redhat.com/archives/libguestfs/2022-January/msg00055.html Part 2: https://listman.redhat.com/archives/libguestfs/2022-January/msg00057.html This is part 3 of my performance analysis of virt-v2v over the last year. In this email I cover conversion from VMware to a local disk using VDDK. This is a more realistic test than doing local disk to local disk conversions. As you can see from the new chart in the attached file [LibreOffice Calc format] modular virt-v2v has got a little faster over all, with conversion taking slightly longer and copying being slightly faster. If you expand the hidden columns (between columns F & M) you will also see clearly the new flushing behaviour of nbdcopy, where it always flushes the output to disk, versus "qemu-img convert" which used the page cache (notice the Sync times in column L). This can make old virt-v2v appear to be much faster, but the appearance is not real. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html