linux-kernel - Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

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Message-ID: <4CD26270.5050906@kernel.org>
Date:	Thu, 04 Nov 2010 08:36:16 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Nathan Lynch <ntl@...ox.com>
CC:	Christoph Hellwig <hch@....de>,
	Oren Laadan <orenl@...columbia.edu>,
	ksummit-2010-discuss@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kapil@....neu.edu, gene@....neu.edu
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

Hello,

On 11/04/2010 02:47 AM, Nathan Lynch wrote:
>>   In this case whitelisting the allowed
>> state by requiring special APIs for all I/O (or even just standard
>> APIs as long as they are supposed by the C/R lib you're linked against)
>> is the more pragmatic, and I think faithful aproach.
> 
> I don't think users will go for it.  They'll continue to use dodgy
> out-of-tree kernel modules and/or LD_PRELOAD hacks instead of porting
> their applications to a new library.  I think a C/R library is an
> "ideal" solution, but it's one that nobody would use - especially in
> HPC, unless the library somehow provides better performance.

I hear that there are plans to integrate one of the userland
snapshotting implementations with HPC workload manager.  ISTR the
combination to be condor + dmtcp but not sure.  I think things like
that make a lot of sense.  Scientists writing programs for HPC
clusters already work in given frameworks and what those applications
do and how to recover are pretty well confined/defined.  If you
integrate snapshotting with such frameworks, it becomes pretty easy
for both the admins and users.

I'll talk about other issues in the reply to Oren's email.

Thanks.

-- 
tejun
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