From: Goswin von Brederlow <goswin-v-b@web.de>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Asynchronous IO programming in OCaml
Date: Mon, 25 Oct 2010 10:42:05 +0200 [thread overview]
Message-ID: <87y69mk6jm.fsf@frosties.localdomain> (raw)
In-Reply-To: <20101024225037.GA8999@aurora> ("Jeremie Dimino"'s message of "Mon, 25 Oct 2010 00:50:37 +0200")
Jérémie Dimino <jeremie@dimino.org> writes:
> On Sun, Oct 24, 2010 at 01:54:50PM -0700, Anil Madhavapeddy wrote:
>> Async disk I/O under Linux is annoyingly problematic if you aren't using
>> direct I/O (and hence page/block-aligned structures). Avoid if possible :)
>
> The next version of Lwt will support asynchronous disk I/O by using
> mincore + mmap. It is already in the development version.
>
> Jérémie
Doesn't that mean you have to do polling of all pending I/O? That seems
horrible ineficient (you check them all every time) or slow I/Os can
starve quick ones (you only check the oldest ones).
The nice thing about libaio is that you get events as I/O completes and
you get many events in one simple syscall. Doing thousands of I/O
requests in parallel is trivial there.
MfG
Goswin
next prev parent reply other threads:[~2010-10-25 8:42 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-24 10:34 Jon Harrop
2010-10-24 12:51 ` [Caml-list] " philippe
2010-10-24 12:52 ` Dario Teixeira
2010-10-24 16:33 ` oliver
2010-10-24 18:50 ` Dario Teixeira
2010-10-24 19:04 ` bluestorm
2010-10-24 20:02 ` oliver
2010-10-24 21:51 ` Michael Ekstrand
2010-10-24 16:17 ` Jake Donham
2010-10-24 20:54 ` Anil Madhavapeddy
2010-10-24 22:50 ` Jérémie Dimino
2010-10-25 3:42 ` Markus Mottl
2010-10-25 7:49 ` Richard Jones
2010-10-25 8:42 ` Goswin von Brederlow [this message]
2010-10-25 11:10 ` Jérémie Dimino
[not found] ` <AANLkTimP77PDEChW3Yt6uUy_qxYpj6EOZWQ_==id-LBC@mail.gmail.com>
[not found] ` <20101025143317.GB32282@aurora>
2010-10-25 15:34 ` Yaron Minsky
2010-10-25 17:26 ` Jérémie Dimino
2010-10-27 9:33 ` Goswin von Brederlow
2010-10-27 11:18 ` Jérémie Dimino
2010-10-27 13:43 ` Goswin von Brederlow
2010-10-27 15:30 ` Jérémie Dimino
2010-10-28 9:00 ` Goswin von Brederlow
2010-10-28 9:28 ` Jérémie Dimino
2010-10-28 10:11 ` Goswin von Brederlow
2010-10-25 15:58 ` DS
2010-10-24 20:42 ` Goswin von Brederlow
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