linux-kernel - Re: [PATCH] tags: much faster, parallel "make tags"

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Date:	Wed, 15 Apr 2015 12:51:06 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tags: much faster, parallel "make tags"

On Wed, Apr 15, 2015 at 12:38 PM, Michal Marek <mmarek@...e.cz> wrote:
> On 2015-04-14 19:20, Alexey Dobriyan wrote:
>> ctags is single-threaded program. Split list of files to be tagged into
>> equal parts, 1 part for each CPU and then merge the results.
>>
>> Speedup on one 2-way box I have is ~143 s => ~99 s (-31%).
>> On another 4-way box: ~120 s => ~65 s (-46%!).
>
> I want this! :-)
>
>
>> +     # seems like Useless Use of cat(1) but not really
>> +     NR_LINES=$(cat .make-tags.src | wc -l)
>
> wc -l <.make-tags.src

Indeed.

I'll change script to use getconf, since it appears to be standardized.
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