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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TIP 6: explain analyze is your friend
