Re: [PATCH] mk: optimize directory dependencies

From: Robin Jarry <robin.jarry@6wind.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: Olivier Matz <olivier.matz@6wind.com>,
	dev@dpdk.org, ferruh.yigit@intel.com, thomas.monjalon@6wind.com
Subject: Re: [PATCH] mk: optimize directory dependencies
Date: Tue, 24 Jan 2017 13:31:06 +0100	[thread overview]
Message-ID: <20170124123106.uprr62tzlwquhbvj@6wind.com> (raw)
In-Reply-To: <20170124112633.GA156840@bricha3-MOBL3.ger.corp.intel.com>

Hi Bruce,

2017-01-24, Bruce Richardson:
>what are the differences in the patches like when doing a build rather
>than just a config? If the build is minutes long because of slow IO,
>is the extra 10 seconds really going to make that much of a difference?

I agree there is no significant difference in total build time (config 
included) when using -j8 (about ~15s). And I understand your concern 
about the complexity of the patch in the second solution.

But the way dependencies are computed is overly complex and I feel that 
parallelizing is just hiding dust under the carpet. The result after the 
second solution is cleaner (to me): we get rid of an obscure shell 
script and we stop piping make output to files thus restoring the 
possibility to use make -d to debug problems.

And while the goal is to reduce the config time, why not go all the 
way?

-- 
Robin