Notice that the real and system time were dramatically reduced by using a
larger page size. Additional testing shows system time being cut in half and
large reductions in reported user time as well.
'vmstat 10' while the application is running shows the huge effect of
4K pagesize vs 2MB pagesize. With 4K pagesize, the 'pi' value reaches
180561 but with 2MB pagesize, the 'pi' value reaches only 1207:
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s1 s2 s3 s4 in sy cs us sy id
0 0 0 127507048 110430156 0 180561 0 0 0 0 0 0 0 0 0 996 1120 460 2 1 97
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s1 s2 s3 s4 in sy cs us sy id
0 0 0 113485140 96406824 284 1207 0 0 0 0 0 0 0 0 0 867 7630 497 2 1 97
It seems that we need a "slab allocator" or an adaptive allocation
policy for the process VM system.
Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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