From: "Peter C. Chapin" <PChapin@vtc.vsc.edu>
Subject: Re: Does GNAT support a thread-free RTS?
Date: Tue, 13 Sep 2011 06:57:05 -0400
Date: 2011-09-13T06:57:05-04:00 [thread overview]
Message-ID: <avSdnaVNFJeQqvLTRVn_vwA@giganews.com> (raw)
In-Reply-To: <m2fwk04zet.fsf@pushface.org>
On 2011-09-13 04:30, Simon Wright wrote:
> Simon Wright<simon@pushface.org> writes:
>
> My prompt for asking this was a colleague who was used to Erlang and was
> complaining that GNAT's use of OS threads meant he would have to change
> his design mindset to not use thousands of tasks (Erlang processes).
If one is in control of the run time library and if the underlying OS
supports asynchronous I/O, then I believe it is possible to write a user
mode thread library that works "nicely" even in the face of I/O
operations. When calling an I/O operation that might block the library
uses asynchronous I/O so that the single kernel thread can be scheduled
onto a different user thread while the I/O completes.
> I believe Scala is similar.
In Scala you can create "thread based" actors that consume a single
thread each or "event based" actors that can all share a single thread.
I haven't experimented with this but my guess is that if you do a
blocking operation while handling an event you may well tie up all event
based actors. I imagine the thread based actors would continue to work,
however.
Peter
prev parent reply other threads:[~2011-09-13 10:57 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-10 15:19 Does GNAT support a thread-free RTS? Simon Wright
2011-09-11 8:20 ` J-P. Rosen
2011-09-11 9:22 ` John B. Matthews
2011-09-11 9:49 ` anon
2011-09-11 10:29 ` Pascal Obry
2011-09-12 0:33 ` anon
2011-09-12 7:27 ` Simon Wright
2011-09-12 9:26 ` Ludovic Brenta
2011-09-12 9:49 ` Ludovic Brenta
2011-09-13 1:22 ` anon
2011-09-12 13:01 ` Robert A Duff
2011-09-11 10:36 ` Simon Wright
2011-09-12 7:19 ` Ludovic Brenta
2011-09-12 23:22 ` Rugxulo
2011-09-13 7:03 ` Ludovic Brenta
2011-09-13 7:55 ` Ludovic Brenta
2011-09-13 8:30 ` Simon Wright
2011-09-13 9:39 ` Georg Bauhaus
2011-09-13 12:18 ` Dmitry A. Kazakov
2011-09-13 14:02 ` Robert A Duff
2011-09-13 16:35 ` Dmitry A. Kazakov
2011-09-13 16:54 ` Georg Bauhaus
2011-09-13 20:35 ` Dmitry A. Kazakov
2011-09-13 21:22 ` Georg Bauhaus
2011-09-14 7:58 ` Dmitry A. Kazakov
2011-09-13 10:57 ` Peter C. Chapin [this message]
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