Re: Re[2]: ghci and ghc -threaded broken with pipes & forking

[Malcolm Wallace]

> > Had you deprecated the non-threaded RTS, we would probably have no
> > problems described in ticket #2848 :-/
> 
> > I think you'll have to deprecate it anyway, because it will be more
> > and more difficult to maintain two versions of code,
> 
> we may conduct small survey on amount of usage of old RTS (i mean ask
> this in haskell-cafe)

For the only application I tried, using the threaded RTS imposes a 100%
performance penalty - i.e. computation time doubles, compared to the
non-threaded RTS.  This was with ghc-6.8.2, and maybe the overhead has
improved since then?

Regards,
Malcolm
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RE: Re[2]: ghci and ghc -threaded broken with pipes & forking

[Brian B]

Hi Bulat,

My contribution to the survey: I've used forkProcess to daemonize
a ghc program inside the haskell fuse bindings:
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HFuse
http://code.haskell.org/hfuse/System/Fuse.hsc

If removing the non-threaded RTS would break forkProcess entirely,
these bindings would have to do something different. The issue: users
of the FUSE C api will get daemonized using daemon(2); it'd be
nice if GHC fuse programs could behave similarly.

Thanks,
Brian Bloniarz

> Hello Tomasz,
> 
> Saturday, December 6, 2008, 10:52:39 PM, you wrote:
> 
> > Had you deprecated the non-threaded RTS, we would probably have no problems
> > described in ticket #2848 :-/
> 
> > I think you'll have to deprecate it anyway, because it will be more
> > and more difficult
> > to maintain two versions of code, especially if one of them will be
> > much less used and
> > tested.
> 
> we may conduct small survey on amount of usage of old RTS (i mean ask
> this in haskell-cafe)
> 
> 
> -- 
> Best regards,
>  Bulatmailto:[EMAIL PROTECTED]
> 
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