Comment 14 for bug 771512

I have tested the above patch with 50 simultaneous builds and the timeouts are gone.

(Additionally, after testing this and applying the merge prop diff for: https://bugs.launchpad.net/nova/+bug/766404
and a proposed fix for: https://bugs.launchpad.net/nova/+bug/781435

we can now get 50 instances all in the ACTIVE state when building them in parallel. Woo!)

There's another issue when we go to 100 instances, now. Getting lots of 'IOError: Socket closed' when carrot tries to connect to rabbit. Ultimately, I think we need to make some changes to nova-api to make it handle this level of concurrent sessions. I have some ideas, but I want to look at the api code, which I'm not that familiar with, before I make some statements that might be idiotic. :)