Indeed. I filed a bug earlier today to make use of this.
On Thu, Jul 31, 2014 at 6:15 PM, Edward Kmett <[email protected]> wrote: > Interesting. > > I suppose ekg could also (ab)use this. > > Johan? > > -Edward > > > On Thu, Jul 31, 2014 at 5:51 AM, Simon Marlow <[email protected]> wrote: >> >> Hey Bryan, >> >> Sorry for the delay. >> >> >> On 15/07/14 01:57, Bryan O'Sullivan wrote: >>> >>> I spent a bit of time over the weekend trying to figure out how to force >>> the RTS to collect GC statistics, but was unable to do so. >>> >>> I'm currently working on enriching criterion's ability to gather data, >>> among which I'd like to see GC statistics. If I try to obtain GC stats >>> using criterion when I'm not running the benchmark app with +RTS -T, I >>> get an exception. >>> >>> Is there a way to allow criterion to forcibly enable stats collection? >>> My efforts to do so have gotten me nowhere. It would be unfortunate if I >>> had to tell users of criterion that they should always run with +RTS -T >>> or add a -rtsopts clause, as they'll simply forget. >>> >>> And while I'm asking, why does GHC not simply collect GC stats by >>> default? Collecting them seems to have zero cost, from what I can see? >> >> >> So you can do this in the same way as GHC. See >> >> >> https://phabricator.haskell.org/diffusion/GHC/browse/master/ghc/hschooks.c;6fa6caad0cb4ba99b2c0b444b0583190e743dd63$18-28 >> >> Which is imported into Haskell like this: >> >> >> https://phabricator.haskell.org/diffusion/GHC/browse/master/ghc/Main.hs;6fa6caad0cb4ba99b2c0b444b0583190e743dd63$847-848 >> >> I'm not sure why it's marked "safe", but it doesn't hurt. >> >> This API is kind-of public, in the sense that we deliberately expose it >> via the Rts.h header, and I'll try not to break it gratuitously. >> >> Cheers, >> Simon >> >> _______________________________________________ >> ghc-devs mailing list >> [email protected] >> http://www.haskell.org/mailman/listinfo/ghc-devs > > _______________________________________________ ghc-devs mailing list [email protected] http://www.haskell.org/mailman/listinfo/ghc-devs
