I have done the following: $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.0.3 $ ghc -O2 -o myapp --make main.hs -prof -auto-all -rtsopts -fforce-recomp $ ./myapp foo.csv +RTS -hb $ cat ./myapp.hp JOB "myapp foo.csv +RTS -hb" DATE "Wed Jun 22 00:34 2011" SAMPLE_UNIT "seconds" VALUE_UNIT "bytes" BEGIN_SAMPLE 0.00 END_SAMPLE 0.00 BEGIN_SAMPLE 0.00 END_SAMPLE 0.00 I get the same result from other -h options. There are a total of 4 hs files compiled for this app. I see the same thing with my rpn calculator. Leaving off the -O2 does not help. Nor does -rtsopts=all. What am I missing? This is on OSX using the Haskel platform with a cabal installed Text.CSV (which I did --reinstall -p on to be certain).