RFC: Removing the `-hb` profiling option

[Carter Schonwald]

What about disallowing -hb on threaded builds? That does just sort of punt
it a little bit, it a not quite satisfactory way perhaps

On Friday, May 6, 2016, Evan Laforge <qdunkan at gmail.com> wrote:

> I've used this a lot when looking for leaks.  Especially combined with
> other things like -hbdrag -hc, so I'd be sad to see it go.  Without
> it, how do you find lag and drag?
>
> On the other hand, the entire profiling system has been hard to use
> because of crashes (perhaps due to that thread-unsafety thing), but
> also because of lack of documentation, the fact that SCCs can
> drastically change the performance of the things they are trying to
> measure, and probably just personal incompetence.  But that's not
> really directly relevant to -hb, except to say I'd rather fix it than
> delete it.
>
> On Fri, May 6, 2016 at 2:04 AM, Erik de Castro Lopo
> <mle+hs at mega-nerd.com <javascript:;>> wrote:
> > Hi all,
> >
> > After a bit of rather tedious and frustrating debugging I came to the
> > realisation that the code for the `-hb` profiling option is not thread
> > safe. See https://ghc.haskell.org/trac/ghc/ticket/12019
> >
> > This gives us an opportunity to simply remove it instead of fixing it.
> > If there is anyone that thinks this future is really useful (ie more
> > useful than the other profiling modes) then I'm willing to fix it.
> > But if noone would miss it. I'd much rather remove it.
> >
> > Thoughts?
> >
> > Erik
> > --
> > ----------------------------------------------------------------------
> > Erik de Castro Lopo
> > http://www.mega-nerd.com/
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