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Subject: Re: [PATCH 0/2] Build ORC fast lookup table in scripts/sorttable tool
From:   changhuaixin <changhuaixin@linux.alibaba.com>
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> On Apr 29, 2020, at 4:49 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> 
> On Wed, Apr 29, 2020 at 02:46:24PM +0800, Huaixin Chang wrote:
>> Move building of fast lookup table from boot to sorttable tool. This saves us
>> 6380us boot time on Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz with cores.
> 
> And what does it add to the build time?

It takes a little more than 7ms to build fast lookup table in sorttable on the same CPU. And it is on the critical path.