I think that biographical profiling is quite nice! I wouldn't say that it is *more* useful than other modes of profiling, but it is certainly complementary, and helps give you an idea of what's going on. So I'd very much vote for fixing it rather than removing it. -Iavor On Fri, May 6, 2016 at 2:04 AM, Erik de Castro Lopo 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/ _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

On 05/06/2016 11:04 AM, Erik de Castro Lopo 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.

I can't say I've ever used the option, but just to inform discussion... Do you have any guesstimate[1] of how much effort it would take to fix vs. just removing? Unless there's a reasonably clear idea of how much effort there's going to be in it[2], I usually err on the side of removal *unless* a really good case can be made. Regards, [1] As ballpark as you like. Even a ratio would work, I think. [2] Which tends to not be the case for threading-related issues.