[Haskell-cafe] Re: #haskell works

Peter Hercek phercek at gmail.com
Sat Dec 15 13:17:08 EST 2007

Tim Chevalier wrote:
> On 12/15/07, Peter Hercek <phercek at gmail.com> wrote:
>> Tim Chevalier wrote:
>>> Try the -Rghc-timing flag.
>> Interesting, that one does not work in my program compiled with
>>   ghc 6.8.1 (looks like ghc runtime does not consume it but passes
>>   it to my haskell code). +RTS -tstderr works but its usability is
>>   limited since it provides only elapsed time and not the process
>>   cpu times.
> Sorry, my mistake -- it's an RTS option, so:
> ./program +RTS -Rghc-timing -RTS
> and I guess you have to compile with -prof.

I guess it is just buggy in 6.8.1.
That option does not seem to work, not even as an RTS option
  and even when I compile with "-prof -auto-all".
But the user guide states that the result should be the same
  as with "+RTS -tstderr" and if so then it is not that
  interesting (since cpu times are missing). Btw, "+RTS -tstderr"
  works without -prof too, which is nice :)
I liked the idea that ghc generated exe can report its times
  too (I meant also cpu times and not only the elapsed time)
  but external programs work well for this too, so never mind.


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