I'm using GHC 6.2.1 on Windows 2000. Problem 1: -hr crashes in some circumstances. Take this program (Test.hs): module Main where import IO main = do readFile "large.csv" putStrLn "OK" where large.csv is an 800K CSV file (with very small files, the bug doesn't occur). I compile with: ghc -prof -auto-all Test.hs and run with: a.out +RTS -hr and get a Windows error message indicating that the program had to be terminated. The "OK" appears, though. When I run the test program repeatedly, it sometimes works fine (which is not the case for the real-world program I'm trying to profile). Other options (-hc, -hy etc) work fine. Unfortunately, retainer information is the most useful of them all... Problem 2: hp2ps doesn't work at all. When trying to read this file (a.out.hp): JOB "a.out +RTS -hr " DATE "Fri Apr 16 11:15 2004" SAMPLE_UNIT "seconds" VALUE_UNIT "bytes" BEGIN_SAMPLE 0.00 END_SAMPLE 0.00 BEGIN_SAMPLE 0,01 END_SAMPLE 0,01 it says "a.out.hp, line 7, floating point number must follow BEGIN_SAMPLE". I assume the apparently mixed English/German number formatting causes this problem. -Stefan