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Re: sockets exn- one day i'll learn to put things down

  • To: Anil Madhavapeddy <anil@xxxxxxxxxx>
  • From: Richard Mortier <Richard.Mortier@xxxxxxxxxxxxxxxx>
  • Date: Wed, 2 Nov 2011 17:24:41 +0000
  • Accept-language: en-US, en-GB
  • Acceptlanguage: en-US, en-GB
  • Cc: Mirage List <cl-mirage@xxxxxxxxxxxxxxx>
  • List-id: MirageOS development <cl-mirage.lists.cam.ac.uk>
  • Thread-index: AcyZhHb4o1mdFD0vQdCNTEfKq6R89A==
  • Thread-topic: sockets exn- one day i'll learn to put things down

On 1 Nov 2011, at 18:42, Anil Madhavapeddy wrote:

> Firstly, lets add the record backtrace to the main function; very useful!

pull request sent :)

> On the Lwt front, you are hitting the fact that the backtrace is lost between 
> threads due to the Lwt monad. However, the pa_lwt syntax extension has an 
> option to preserve the backtrace.  I haven't turned this on due to a certain 
> difficulty with figuring out how to make it optional in ocamlbuild. 
> However, I could just turn it on permanently, with us remembering to turn it 
> off when doing performance tests for production runs, where thread backtrace 
> recording may be too expensive.
> Any objections to that?

aha. i have no objections - i'll start making use of that now anyway.  (presume 
you mean passing -lwt-debug to camlp4 as noted at 
<http://ocsigen.org/lwt/manual/> ?)

> On the general topic of debugging, what we really need is an interactive 
> toplevel. Lwt itself has a fantastic one if you install the Debian package 
> (lwt-toplevel) which could let you inspect the state of threads as it runs.  
> This is something that could be ported to Mirage at some point... there's 
> even a native code version of the toplevel now, so the Xen backend could get 
> in on the party too!

hm- perhaps a challenge for after ofelia tutorial is written :)


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