How's the integration of DWARF support coming along?
rarash at student.chalmers.se
Wed Aug 13 18:46:29 UTC 2014
Peter will have to answer that. But it seemed to me that it has been
working fine all the time. I suppose it's just to resolve merge
conflicts. There were some refactorings he wanted to do. In addition to
this it will also be some packaging issues I suppose. I'm hoping Peter
will answer in this mail thread soon, since he knows this much better.
On 2014-08-13 20:01, Johan Tibell wrote:
> What's the minimal amount of work we need to do to just get the dwarf
> data in the codegen by 7.10 (RC late december) so we can start using
> e.g. linux perf events to profile Haskell programs?
> On Wed, Aug 13, 2014 at 7:31 PM, Arash Rouhani
> <rarash at student.chalmers.se <mailto:rarash at student.chalmers.se>> wrote:
> Hi Johan!
> I haven't done much (just been lazy) lately, I've tried to
> benchmark my results but I don't get any sensible results at all yet.
> Last time Peter said he's working on a more portable way to read
> dwarf information that doesn't require Linux. But I'm sure he'll
> give a more acurate update than me soon in this mail thread.
> As for stack traces, I don't think there's any big tasks left, but
> I summarize what I have in mind:
> * The haskell interface is done and I've iterated on it a bit,
> so it's in a decent shape at least. Some parts still need testing.
> * I wish I could implement the `forceCaseContinuation` that I've
> described in my thesis. If someone is good with code
> generation (I just suck at it, it's probably simple) and is
> willing to assist me a bit, please say so. :)
> * I tried benchmarking, I gave up after not getting any useful
> * I'm unfortunately totally incapable to help out with dwarf
> debug data generation, only Peter knows that part,
> particularly I never grasped his theoretical framework of
> causality in Haskell.
> * Peter and I have finally agreed on a simple and sensible way
> to implement `catchWithStack` that have all most good
> properties you would like. I just need to implement it and
> test it. I can definitely man up and implement this. :)
> Here's my master thesis btw , it should answer Ömer's question
> of how we retrieve a stack from a language you think won't have a
> stack. :)
> : http://arashrouhani.com/papers/master-thesis.pdf
> On 2014-08-13 17:02, Johan Tibell wrote:
>> 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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