This may bring more light to the investigation as it appear that with LTO & PGO optimisation disabled on Trusty, the trusty version becomes slower than the Xenial stock version. Disabling optimisation on Xenial makes little difference though.
So maybe the PGO & LTO optimisation on Trusty is more efficient than on Xenial and leads to better results,hence better performance. Just a thought
Hello,
Following doko's advice, I ran a set of test with PGO & LTO optimization disabled.
Here are the results : https:/ /docs.google. com/spreadsheet s/d/1tTlEOvMypw Kwi99XHjvuQFE14 _jpBBLy0- Mk6bjkvL0/ edit#gid= 1169944329
This may bring more light to the investigation as it appear that with LTO & PGO optimisation disabled on Trusty, the trusty version becomes slower than the Xenial stock version. Disabling optimisation on Xenial makes little difference though.
So maybe the PGO & LTO optimisation on Trusty is more efficient than on Xenial and leads to better results,hence better performance. Just a thought