question on page-migration code

Ray Bryant
2005-04-07T23:05:37Z

Well, even my previous description is not quite correct.
Here are the times for a series of 20 migrations,
from nodes 0-3 to 4-7, and then back again:

0.134u 1.425s 0:02.98 52.0% 0+0k 0+0io 1pf+0w
0.124u 0.395s 3:22.11 0.2% 0+0k 0+0io 24pf+0w
0.154u 1.494s 0:03.03 54.1% 0+0k 0+0io 8pf+0w
0.134u 1.137s 1:04.38 1.9% 0+0k 0+0io 28pf+0w
0.119u 0.723s 1:20.16 1.0% 0+0k 0+0io 8pf+0w
0.142u 1.299s 0:39.06 3.6% 0+0k 0+0io 28pf+0w
0.124u 0.526s 2:20.03 0.4% 0+0k 0+0io 0pf+0w
0.135u 1.336s 0:22.18 6.5% 0+0k 0+0io 0pf+0w
0.125u 1.128s 0:36.73 3.3% 0+0k 0+0io 8pf+0w
0.129u 1.099s 0:59.17 2.0% 0+0k 0+0io 28pf+0w
0.130u 0.679s 1:53.12 0.7% 0+0k 0+0io 8pf+0w
0.139u 1.193s 0:52.88 2.4% 0+0k 0+0io 28pf+0w
0.121u 0.621s 1:57.64 0.6% 0+0k 0+0io 8pf+0w
0.127u 1.241s 0:43.46 3.1% 0+0k 0+0io 28pf+0w
0.127u 0.734s 1:19.92 1.0% 0+0k 0+0io 8pf+0w
0.126u 1.317s 0:51.17 2.7% 0+0k 0+0io 28pf+0w
0.137u 0.613s 2:19.44 0.5% 0+0k 0+0io 8pf+0w
0.113u 1.290s 0:42.33 3.3% 0+0k 0+0io 28pf+0w
0.125u 0.538s 2:06.91 0.5% 0+0k 0+0io 7pf+0w
0.128u 1.328s 0:41.59 3.4% 0+0k 0+0io 28pf+0w

So trial #3 is an anamoly, since it completed quickly
as well. All the rest of the trials completed very
slowly, in comparison.

Any idea what is going on here?

AFAIK, the test program is in steady state and doesn't
do any I/O. So its behavior should not be a factor.
--
Best Regards,
Ray