I'm trying to profile my code using Instruments. What I get is something like the following window:
What I don't understand is: below lq_cohomology, Instruments lists HeapMatrix::pivot. This method is never called directly from lq_cohomology, but only from other functions called by lq_cohomology. Furthermore, I don't understand why `HeapMatrix::pivot shows up multiple times in the profile. Shouldn't that occur only a single time?