Hey there, We've talked about the slow Xenial gate during the OpenStack Summit this week and I decided to do a little digging. I built two quick test instances: one with Trusty and the other with Xenial.
Trusty comes with python 2.7.6 and Xenial has 2.7.12. Here are the initial comparisons: https://gist.github.com/major/20d7d11442685355c30d0abf0c07be98 The worst test shows that 2.7.12 on Xenial is 1.88 slower than 2.7.6 on Trusty. Wow. I compiled 2.7.12 from source on Xenial to see if it's a packaging issue, but that didn't change anything much. I then compiled 2.7.12 on 14.04 and found it be to be slightly slower than 2.7.6 on 14.04, but faster than 2.7.12 on 16.04. That's confusing, so here's a ranking from fastest to slowest performance: 1) 2.7.6 on Ubuntu 14.04 (fastest) 2) 2.7.12 compiled from source on Ubuntu 14.04 (a little slower than #1) 3) 2.7.12 compiled from source on Ubuntu 16.04 (slightly faster than #4) 4) 2.7.12 on Ubuntu 16.04 (significant slower than #1) It's evident that 2.7.12 is a little bit slower, but something in Ubuntu 16.04 makes it much worse. I checked sysctl settings and the only big difference was the max threads per process (16.04 was about half of 14.04). I set them both to the same value but the performance testing didn't change. Does anyone else have any ideas of what might be causing this? -- Major Hayden
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