Re: coccinelle: improve array.cocci

From: Markus Elfring <markus.elfring@web.de>
Date: Nov 22, 2019, 16:17 UTC
Message-ID: <c9cc76dc-615f-ff89-6305-64d897734a4a@web.de>
In-Reply-To: <20191122152950.GZ23183@szeder.dev>

> I did try --jobs on a couple of occasions,

Thanks for your feedback.

> and the results always varied between broken, not working,

The parallelisation support by the Coccinelle software was questionable for a while.

> or downright making things even slower.

I wonder about this information.

…

>   spatch version 1.0.4 with Python support and with PCRE support

…

>   Fatal error: exception Sys_error("array: No such file or directory")

Another bit of background information:
* https://lore.kernel.org/cocci/99082e9d-8047-eee3-68dd-9849868d4a96@users.sourceforge.net/
  https://systeme.lip6.fr/pipermail/cocci/2016-August/003546.html

* https://lore.kernel.org/cocci/alpine.DEB.2.10.1506171707190.2578@hadrien/
  https://systeme.lip6.fr/pipermail/cocci/2015-June/002141.html

…

> Therefore, merely passing in '--jobs <N>' doesn't bring any runtime benefits:

This program parameter should be used for other command variants.

…

> It appears that batching 'spatch' invocations with 1.0.8 does not
> bring the same benefits as with 1.0.4, but brings slowdowns instead...

Would you like to share your experiences also on the Coccinelle mailing list?

Regards, Markus