From: "J. Bruce Fields" <bfields@fieldses.org>
To: Peng Yu <pengyu.ut@gmail.com>
Cc: linux-nfs@vger.kernel.org
Subject: Re: 30 time speed difference between using NFS and without using NFS
Date: Mon, 30 Aug 2010 13:09:24 -0400 [thread overview]
Message-ID: <20100830170923.GA17103@fieldses.org> (raw)
In-Reply-To: <AANLkTimog6uTdsxzFeA0YY+HK6gtcwEGXaFDJs+Aorm0@mail.gmail.com>
On Fri, Aug 27, 2010 at 06:08:25PM -0500, Peng Yu wrote:
> Hi,
>
> I use the following command to search for some directory.
>
> find -L some_dir -type d -name some_name
>
> If I'm on the machine that has some_dir locally, the run time is
> real 0m0.199s
> user 0m0.048s
> sys 0m0.140s
>
> If I'm on another machine that sees the same directory by NFS (NFS3).
> the run time is
> real 0m6.509s
> user 0m0.090s
> sys 0m1.380s
>
> There are 30 time speed difference. Is this normal? Is there any NFS
> parameter that I should tune to make the latter faster?
How many directories are there in some_dir? What's the round trip time
(e.g. as reported by ping) to the server? If you repeate the find
immediately, is it faster?
This can indeed by much slower if it requires revalidating the cached
attributes of each file.
--b.
next prev parent reply other threads:[~2010-08-30 17:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-27 23:08 30 time speed difference between using NFS and without using NFS Peng Yu
2010-08-30 17:09 ` J. Bruce Fields [this message]
2010-08-30 21:39 ` Peng Yu
2010-08-31 16:23 ` J. Bruce Fields
2010-08-31 21:27 ` Peng Yu
2010-09-01 1:15 ` J. Bruce Fields
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