linux-kernel - Re: [PATCH 3/3] coccicheck: add parallel execution

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Date:	Wed, 13 Jul 2011 21:14:34 -0500
From:	Greg Dietsche <gregory.dietsche@....edu>
To:	Joe Perches <joe@...ches.com>
CC:	julia@...u.dk, Gilles.Muller@...6.fr, npalix.work@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, cocci@...u.dk
Subject: Re: [PATCH 3/3] coccicheck: add parallel execution

On 07/12/2011 09:42 PM, Joe Perches wrote:
> On Tue, 2011-07-12 at 20:26 -0500, Greg Dietsche wrote:
>    
>> For example to process 6 SmPL patches at the same time:
>> 	make coccicheck PARALLEL=6
>> Results are held in /tmp until the scripts finish. By doing this the
>> script is able to collate the results from each SmPL patch instead of
>> interleaving them in the output.
>>      
> You might try adding support for gnu parallel instead.
> http://www.gnu.org/software/parallel/
>
>    
That is a very interesting and useful tool :) I'd never heard of it 
before. The man page scares me a little bit - lots of options are marked 
as "alpha testing," but the ones i tried seemed to work fine. Anyway, 
without any modifications to Coccinelle, it is possible to do this:

ls scripts/coccinelle/*/*.cocci | parallel -j+0 make coccicheck COCCI={} 
MODE=patch

it seems to behave mostly like my patch, but doesn't cleanup quite as 
well if you decide to kill it with ctrl-c (it leaves instances of spatch 
running). On the upside, it is up to 3 seconds faster than my patch 
(because my patch waits 3 seconds before checking on the number of jobs 
that are running).

Greg
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