It seems that the overhead is unnoticeable if disabled, very visible
for lightweight functions and heavy callers. Almost unnoticeable for
more compute intensive functions.


The very high system times seem odd.  Maybe you have a machine with
slow gettimeofday()?


So it seems (on Ubuntu 7.04). Reran the benchmark on another system and
got more reasonable results:

"none"  usr      sys    total
dummy   15.9     0.68   16.58
rfact   39.37    0.07   39.44
ifact   12.89    0.01   12.9

"all"   usr      sys    total    diff x
dummy   20.82    4.44   25.26    1.52
rfact   45.17    4.17   49.34    1.25
ifact   12.92    0.03   12.96    1.00

Regards,
Martin

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