Prof doesn't work on large programs

[lance.norskog]

The prof program works fine on small programs, but blows up on large programs.
This is not the fault of prof, but is caused by the plate-of-shrimp malloc
library.  Realloc() misbehaves, and so a list small enough not cause a
realloc() works.  I've only spotted this on 386 UNIX from AT&T.

If you want to prof a big program, you're stuck with using GNU in robitussin
mode.