lock contention etc.
Julian Elischer
julian at elischer.org
Thu Feb 1 19:36:24 UTC 2007
here's an intersting set of numbers..
notice the increase in 'system time' for the same work done when there
is more parallelism.
make buildworld
3762.94 real 2627.66 user 1275.78 sys
3763.32 real 2632.04 user 1271.80 sys
3763.34 real 2627.99 user 1276.39 sys
3763.03 real 2632.50 user 1270.91 sys
make -j 2 buildworld
2465.10 real 2958.94 user 1918.64 sys
2463.97 real 2968.43 user 1910.65 sys
2472.13 real 2978.64 user 1912.80 sys
2582.83 real 2965.51 user 2047.19 sys
make -j 4 buildworld
2262.88 real 4322.31 user 3333.58 sys
2255.88 real 4330.32 user 3319.48 sys
2256.09 real 4318.84 user 3336.57 sys
2257.63 real 4338.34 user 3313.07 sys
(2 processors with HTT) (looks like 4 processors)
-current, sched_4bsd
I'm guessing that the extra system time represents a lot of
contention somewhere.
What is the best way to get actual numbers on this?
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