AIX Version 4.3 Differences Guide

Table 9. Old Priority Algorithm, sched_R=8
nice
delta
Number of threads running (1 niced, others default)
1 2 3 4 5 8 16 32
-20 100 78 60 55 52 47 43 41
-15 100 68 54 48 44 39 34 32
-10 100 60 47 40 36 30 25 23
-5 100 55 40 32 28 21 15 13
0 100 50 33 25 20 13 6 3
5 100 45 27 18 12 3 0 0
10 100 40 20 10 4 0 0 0
15 32 14 2 0 0 0 0 0
19 100 24 8 0 0 0 0 0
Table 10. New Priority Algorithm, sched_R=8
nice
delta
Number of threads running (1 niced, others default)
1 2 3 4 5 8 16 32
-20 100 98 96 94 92 86 70 59
-15 100 84 68 58 53 50 43 41
-10 100 68 52 46 41 36 28 27
-5 100 57 42 35 31 23 18 13
0 100 50 33 25 20 13 6 3
5 100 37 18 9 4 0 0 0
10 100 17 6 0 0 0 0 0
15 100 2 0 0 0 0 0 0
19 100 0 0 0 0 0 0 0
Take Note
Changing system scheduling parameters using the schedtune command can
cause unexpected results, particularly if more than one system parameter is
changed. See RS/6000 Performance Tools In Focus, SG24-4989 for more
information on the schedtune command, its parameters, and other performance
monitoring and tuning tools.
28 AIX Version 4.3 Differences Guide