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 >
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