> Well, there are certain things that --enable-cassert turns on that are
> outrageously expensive...I don't think anyone knows what the performance
> impact of just the regular Asserts is; it's been too long since these
> other things were stuck in there.
The next time I'm doing some performance testing I'll try to quantify how
much damage the expensive ones do by playing with pg_config_manual.h.
Normally I'm testing with 1GB+ of shared_buffers which makes the current
assert scheme unusable. If I could run with asserts on only only lose a
small amount of performance just by disabling the clobber and context
checking, that would be valuable to know. Right now I waste a fair amount
of time running performance and assert builds in parallel.