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Re: Bad Metadata performances for XFS?

To: Roger Willcocks <roger@xxxxxxxxxxxxxxxx>
Subject: Re: Bad Metadata performances for XFS?
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 7 Jul 2016 09:05:35 +1000
Cc: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>, "linux-xfs@xxxxxxxxxxxxxxx" <linux-xfs@xxxxxxxxxxxxxxx>, Wang Shilong <wshilong@xxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
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In-reply-to: <1467805769.7631.249.camel@xxxxxxxxxxxxxxxx>
References: <3ED34739A4E85E4F894367D57617CDEF9ED9518B@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20160704225226.GD27480@dastard> <20160705001854.GY12670@dastard> <3ED34739A4E85E4F894367D57617CDEF9ED955AB@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <CAJCQCtRiznrWAmCEgd=uMETnBubh1ZttGP4xF9PLu0_j7XBRuw@xxxxxxxxxxxxxx> <1467805769.7631.249.camel@xxxxxxxxxxxxxxxx>
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On Wed, Jul 06, 2016 at 12:49:29PM +0100, Roger Willcocks wrote:
> On Tue, 2016-07-05 at 14:34 -0600, Chris Murphy wrote:
> > On Mon, Jul 4, 2016 at 7:43 PM, Wang Shilong <wshilong@xxxxxxx> wrote:
> > >
> > >
> > > I understand that this is single thread Limit, but I guess there are some
> > > other Limit here, because even single thread creating 50W files speed
> > > is twice than 200W files.
> > 
> > Watts or Wolframs (tungsten)?
> > 
> > 50W!=50000. You could write it as 50k and 200k. It's unlikely to get
> > confused with 50K and 200K, which are temperatures, because of
> > context. But W makes no sense.
> > 
> > 
> > 
> 
> I suspect it's an abbreviation for the (Chinese) unit 'wan'
> 
> https://www.quora.com/Why-do-Chinese-people-count-in-units-of-10-000
> 
> so it makes perfect sense but it's not an SI unit.

Thanks, Roger - it does make sense now the unit being used has been
explained. This is a canonical example of how being explicit about
units being used and what they mean is of prime importance to
understanding what each other are saying.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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