Re: [PATCH v3 3/8] coccicheck: enable parmap support

From	Julia Lawall <julia.lawall@lip6.fr>
Newsgroups	linux.kernel
Subject	Re: [PATCH v3 3/8] coccicheck: enable parmap support
Date	2016-06-21 23:20 +0200
Message-ID	<rMBfr-2Hb-5@gated-at.bofh.it> (permalink)
References	(1 earlier) <rMzx0-1xY-9@gated-at.bofh.it> <rMAjn-264-9@gated-at.bofh.it> <rMAMq-2gO-23@gated-at.bofh.it> <rMAW5-2lh-7@gated-at.bofh.it> <rMAW5-2lh-5@gated-at.bofh.it>
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On Tue, 21 Jun 2016, Luis R. Rodriguez wrote:

> On Tue, Jun 21, 2016 at 10:43:04PM +0200, Julia Lawall wrote:
> > 
> > 
> > On Tue, 21 Jun 2016, Luis R. Rodriguez wrote:
> > 
> > > On Tue, Jun 21, 2016 at 10:17:38PM +0200, Julia Lawall wrote:
> > > > 
> > > > 
> > > > On Tue, 21 Jun 2016, Luis R. Rodriguez wrote:
> > > > 
> > > > > Coccinelle has had parmap support since 1.0.2, this means
> > > > > it supports --jobs, enabling built-in multithreaded functionality,
> > > > > instead of needing one to script it out. Just look for --jobs
> > > > > in the help output to determine if this is supported.
> > > > > 
> > > > > Also enable the load balancing to be dynamic, so that if a
> > > > > thread finishes early we keep feeding it.
> > > > > 
> > > > > Note: now that we have all things handled for us, redirect stderr to
> > > > > stdout as well to capture any possible errors or warnings issued by
> > > > > coccinelle.
> > > > > 
> > > > > If --jobs is not supported we fallback to the old mechanism.
> > > > > This also now accepts DEBUG_FILE= to specify where you want
> > > > > stderr to be redirected to, by default we redirect stderr to
> > > > > /dev/null.
> > > > 
> > > > Why do you want to do something different for standard error in the parmap 
> > > > and nonparmap case?
> > > 
> > > We should just deprecate non-parmap later.
> > 
> > that's not really getting at the point.  I like the DEBUG_FILE= solution.  
> > I don't like merging stderr and stdout.  So you've put what to my mind is 
> > the good solution only in the deprecated case (to my understanding of 
> > the commit message).
> 
> stderr is not being merged to stdout though. By default stderr goes to /dev/null
> and if you want it you specify a DEBUG_FILE.

Above it says:

Note: now that we have all things handled for us, redirect stderr to 
stdout as well to capture any possible errors or warnings issued by 
coccinelle.

If DEBUG_FILE is an option for the parmap case, it should be mentioned 
there too.

julia



> 
> What will be deprecated has no clean solution for any of this and its unclear
> exactly what happens given separate processes are run in the background
> and we just wait.
> 
>   Luis
>

Thread

[PATCH v3 0/8] coccicheck: modernize "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
  [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
    Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 22:20 +0200
      Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 22:50 +0200
        Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:00 +0200
          Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:20 +0200
            Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:30 +0200
              Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:40 +0200
        Re: [PATCH v3 3/8] coccicheck: enable parmap support "Nicolas Palix (LIG)" <Nicolas.Palix@imag.fr> - 2016-06-21 23:10 +0200
          Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:30 +0200
            Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:40 +0200
              Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:50 +0200
                Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-22 00:40 +0200
                Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-22 07:30 +0200
                Re: [Cocci] [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-22 17:20 +0200
                Re: [Cocci] [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-22 21:50 +0200
              Re: [PATCH v3 3/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-22 00:00 +0200
        Re: [PATCH v3 3/8] coccicheck: enable parmap support Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:30 +0200
  [PATCH v3 8/8] scripts/coccinelle: require coccinelle >= 1.0.4 on device_node_continue.cocci "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
    Re: [PATCH v3 8/8] scripts/coccinelle: require coccinelle >= 1.0.4  on device_node_continue.cocci Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 22:40 +0200
      Re: [PATCH v3 8/8] scripts/coccinelle: require coccinelle >= 1.0.4 on  device_node_continue.cocci "Nicolas Palix (LIG)" <Nicolas.Palix@imag.fr> - 2016-06-21 23:50 +0200
  [PATCH v3 4/8] coccicheck: replace --very-quiet with --quit when debugging "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
  [PATCH v3 1/8] coccicheck: move spatch binary check up "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
    Re: [PATCH v3 1/8] coccicheck: move spatch binary check up "Nicolas Palix (LIG)" <Nicolas.Palix@imag.fr> - 2016-06-21 22:40 +0200
  [PATCH v3 7/8] coccicheck: refer to coccicheck bottest wiki for documentation "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 21:30 +0200
    Re: [PATCH v3 7/8] coccicheck: refer to coccicheck bottest wiki for  documentation "Nicolas Palix (LIG)" <Nicolas.Palix@imag.fr> - 2016-06-21 23:20 +0200
      Re: [PATCH v3 7/8] coccicheck: refer to coccicheck bottest wiki for  documentation Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:20 +0200
        Re: [PATCH v3 7/8] coccicheck: refer to coccicheck bottest wiki for  documentation "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-22 02:10 +0200
          Re: [PATCH v3 7/8] coccicheck: refer to coccicheck bottest wiki for  documentation Julia Lawall <julia.lawall@lip6.fr> - 2016-06-22 08:10 +0200
  Re: [PATCH v3 0/8] coccicheck: modernize Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 22:30 +0200
    Re: [Cocci] [PATCH v3 0/8] coccicheck: modernize "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:00 +0200
      Re: [Cocci] [PATCH v3 0/8] coccicheck: modernize Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:10 +0200
        Re: [Cocci] [PATCH v3 0/8] coccicheck: modernize "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:30 +0200
          Re: [Cocci] [PATCH v3 0/8] coccicheck: modernize "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-21 23:40 +0200
          Re: [Cocci] [PATCH v3 0/8] coccicheck: modernize Julia Lawall <julia.lawall@lip6.fr> - 2016-06-21 23:40 +0200

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