I was able to reproduce non-linear scaling on fake UI with 8 nodes
test with 0 - 8 nodes http://paste.openstack.org/show/406322/
nodes time derivative time per node 0 475 0 0 1 1075 600 600 2 1793 718 659 3 2643 850 722.6666666667 4 3788 1145 828.25 5 4706 918 846.2 6 6313 1607 973 7 8431 2118 1136.5714285714 8 10498 2067 1252.875
(times in msec)
there is a clear coloration in the number of nodes, and how long the serializer takes to finish returning the data.
I was able to reproduce non-linear scaling on fake UI with 8 nodes
test with 0 - 8 nodes http:// paste.openstack .org/show/ 406322/
nodes time derivative time per node
0 475 0 0
1 1075 600 600
2 1793 718 659
3 2643 850 722.6666666667
4 3788 1145 828.25
5 4706 918 846.2
6 6313 1607 973
7 8431 2118 1136.5714285714
8 10498 2067 1252.875
(times in msec)
there is a clear coloration in the number of nodes, and how long the serializer takes to finish returning the data.