Re: [PATCH 3/3] coccicheck: add parallel execution

[Greg Dietsche <gregory.dietsche@cuw.edu>]

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