On 09/11/2013 01:59 AM, Daniel P. Berrange wrote: > On Wed, Sep 11, 2013 at 09:47:07AM +0200, Paolo Bonzini wrote: >> Il 11/09/2013 00:27, James Sparenberg ha scritto: >>> I'm doing some experimenting in our Development lab and as a result >>> I'm kickstarting over and over Virtual guests. This is of course >>> causing the guest Id to increment by one with each test. I've >>> googled around and tried searching the list but have not found out >>> how (if at all) it would be possible to reset the ID number back to 1 >>> more than is in use. Also is there a limit where I run out of ID's? >>> (for example does it only go up to 99?) >> >> No, there is no limit. > > Well, 'int' will wrap eventually, but you'd need to have created > a hell of alot of guests for that to be a problem :-) 2**31 (~2 billion), to be exact, since we store it as a signed int, and I'm not sure if all the code paths handle a negative number gracefully (see src/datatypes.h:_virDomain). (Maybe we should have picked a 64-bit type, so that wraparound would not be possible within our lifetimes even with a process spawning guests as fast as possible on current computers - but even with a 32-bit number, it's going to take a lot of hammering to hit wraparound) -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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