Hello, I wanted to use nhc to profile a simple program but ran into a string of errors. The example I present here is one of four small programs I have played with. This example is from nhc98-1.18 compilied from source, I have played with the 1.18 and 1.16 binary versions also. I'm using debian 3. The program is: #####################strict.hs module Main where foldl' f e [] = e foldl' f e (x:xs) = (foldl' f $! f e x) xs main = print $ foldl' (+) 0 [1..1000] {-main = print $ foldr (+) 0 [1..1000]-} #####################strict.hs With the aim of showing strict.hs would run in constant space as compared to the commented out version. I compilied and ran the program thus (I know I can use hmake instead): $ nhc98 -p -o strict strict.hs $ ./strict +RTS -p -i25kb -RTS 500500 $ hp2graph strict.hp Illegal token JOB at 69 Aborted This is the most common error encountered. Try again: $ ./strict +RTS -p -i24kb -RTS 500500 $ hp2graph strict.hp Segmentation fault Segmentation faults are the second most common error. It is also possible for hp2graph to run without error but it produces invalid postscript that cannot be viewed. Here are the strict.hp files from each run: #####################strict 25kb interval JOB ./strict +RTS -p -i25kb -RTS ; DATE "Tue May 10 21:45:49 2005 " PROFILE_PRODUCER MARK 0.00 SAMPLE 0 0.00 344 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 1 0.00 356 8 <APPLY> 80 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 2 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 3 0.00 344 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 4 0.00 356 8 <APPLY> 80 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 5 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 6 0.00 344 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 7 0.00 ; #####################strict 25kb interval #####################strict 24kb interval JOB ./strict +RTS -p -i24kb -RTS ; DATE "Tue May 10 21:46:40 2005 " PROFILE_PRODUCER MARK 0.00 SAMPLE 0 0.00 328 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 1 0.00 328 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 2 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 3 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 4 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 5 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 6 0.00 328 8 <APPLY> 72 <Main> 8 Builtin.primIntFromInteger 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 7 0.00 544 IO.hPutChar:7:30-7:52 12 <APPLY> 56 <Main> 8 Prelude.primIntegerAdd 8 ; MARK 0.00 SAMPLE 8 0.00 ; #####################strict 24kb interval What am I doing wrong, some option perhaps? Thanks, Ben Fraser