How's the integration of DWARF support coming along?

Ömer Sinan Ağacan omeragacan at
Wed Aug 13 16:45:54 UTC 2014

Is this stack trace support different than what we have currently?
(e.g. the one implemented with GHC.Stack and cost centers)

Ömer Sinan Ağacan

2014-08-13 18:02 GMT+03:00 Johan Tibell <johan.tibell at>:
> Hi,
> How's the integration of DWARF support coming along? It's probably one of
> the most important improvements to the runtime in quite some time since
> unlocks *two* important features, namely
>  * trustworthy profiling (using e.g. Linux perf events and other
> low-overhead, code preserving, sampling profilers), and
>  * stack traces.
> The former is really important to move our core libraries performance up a
> notch. Right now -prof is too invasive for it to be useful when evaluating
> the hotspots in these libraries (which are already often heavily tuned).
> The latter one is really important for real life Haskell on the server,
> where you can sometimes can get some crash that only happens once a day
> under very specific conditions. Knowing where the crash happens is then
> *very* useful.
> -- Johan
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