Also, you need to compile each module in the program twice: once unprofiled, for running TH splices, and once profiled for the final executable. We'd probably need some new flags to GHC to handle this. The TH linker needs to know to link in the unprofiled object files, but the compilation manager needs to generate profiled object files, so we need two separate object suffices. We already have -osuf, so perhaps we need -th-osuf (and hence -th-hisuf). But that's not all. You could get into trouble if the .hi files differed between the profiled and unprofiled versions of modules, because GHC assumes they're the same. I haven't thought through exactly what could go wrong if they're different, but we're definitely on shaky ground here. Compiling without optimisation will probably be necessary, but then that degrades the usefulness of profiling. Cheers, Simon On 11 July 2005 12:44, Simon Peyton-Jones wrote:

Here's a Template Haskell problem. When compiling with -prof, you want to link with *profiled* libraries for the final executable, but with *ordinary, unprofiled* libraries for the TH libs that are linked with GHC itself.

There is nothing truly hard about implementing this, but it's fiddly. This message has been sitting in my mailbox for more than two months, so I'm plainly not getting to it. To unblock, would anyone like to volunteer to have a go? I can tell you where to look.

Simon

...

-----Original Message----- From: template-haskell-bounces@haskell.org [mailto:template-haskell-bounces@haskell.org] On Behalf Of Andre Pang Sent: 25 April 2005 15:42 To: Cc: Sean Seefried Subject: [Template-haskell] Profiling with Template Haskell, again

Hi all,

I've run into the same problem as Sean Seefried, namely that I'd like to profile executables built with Template Haskell:

http://www.haskell.org/pipermail/template-haskell/2003-July/000135.html

...

(Specifically, profiling the final executable, not the splicing.)

I guess this is just a simple message to say that there's someone else asking for profiling support with TH now, in the hopes that it'll bump up its priority on the ever-growing to-do list :).

Thanks,

-- % Andre Pang : trust.in.love.to.save http://www.algorithm.com.au/

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