Vaibhav Kaushal <vaibhavkaushal123(at)gmail(dot)com> writes:
> Why do these lines:
> ...
> repeat twice?
Hm, you're new to using gdb, no? That's pretty normal: gdb is just
reflecting back the fact that the compiler rearranges individual
instructions as it sees fit. You could eliminate most, though perhaps
not all, of that noise if you built the program-under-test (ie postgres)
at -O0.
regards, tom lane