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Date:      Fri, 25 Sep 1998 15:36:26 -0400
From:      Mark Mayo <mark@vmunix.com>
To:        Alex <garbanzo@hooked.net>, current <current@FreeBSD.ORG>
Subject:   Re: shouting in a void?
Message-ID:  <19980925153626.A9927@vmunix.com>
In-Reply-To: <Pine.BSF.4.00.9809232208181.2044-100000@zippy.dyn.ml.org>; from Alex on Wed, Sep 23, 1998 at 10:09:06PM -0700
References:  <199809240237.TAA05857@dingo.cdrom.com> <Pine.BSF.4.00.9809232208181.2044-100000@zippy.dyn.ml.org>

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On Wed, Sep 23, 1998 at 10:09:06PM -0700, Alex wrote:
> On Wed, 23 Sep 1998, Mike Smith wrote:
> [...]
> > > I have a plan to eliminate the disk thrashing, but haven't implemented
> > > it yet.  Once that's done, I believe it will truly be limited by
> > > the network link, unless you've got a T1 or better, or really slow
> > > hardware.
> > 
> > Heh.  You have to see what it does to a cvsup server to believe it. 8)
> > 
> > With 10-15 clients running, the 10krpm Cheetah in freefall is 
> > prettymuch nailed to the wall.  Even if you just cached the stat 
> > results against the mtime for something in the repo, you'd win 
> > enormously.
> 
> Heh.  I wonder what 20 clients do to the Sun Enterprise cvs.kde.org is
> running (for that matter, I wonder what kinda disks its got)..

It will have 7200rpm Seagate cudas. And unless they've got a few disks
striped (preferably in an array) they will thrash and be "nailed to the wall"
just like freefall. And given the fact that doing a stat() seems to take
forever on Solaris, plus the slower drive, I'd wager on a single disk freefall
would eat it up.  :-)

-Mark

> 
> - alex
> 
> 
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-- 
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 Mark Mayo		  				mark@vmunix.com       
 RingZero Comp.  	  		    http://www.vmunix.com/mark 
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 "The problem is how do you build tools that understand your programs
  at a deeper semantic level." - James Gosling

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