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Re: [libvirt] [PATCH 0/4] snapshot: optimize qemu relationship traversal

On Fri, Oct 07, 2011 at 06:05:53PM -0600, Eric Blake wrote:
> After working with ESX and VBox, I realized that a tweak to how
> snapshot relationships are stored would speed things up from O(n^2)
> to O(n).  The hash table must be kept for name lookup, but the

  So we went from 0(n^3) to O(n), sounds good :-)

> speedup comes by tracking relationships with each snapshot rather
> than crawling the entire hash table rebuilding those relations
> for every operation that needs particular relations.

  As long as we are sure there is no risk of stale relationship
metadata, this sounds proper ...


Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/

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