From: Stefan Hajnoczi <stefanha@gmail.com>
To: Dushyant Bansal <cs5070214@cse.iitd.ac.in>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: KVM call agenda for Jan 25
Date: Tue, 1 Mar 2011 09:40:27 +0000 [thread overview]
Message-ID: <AANLkTimMyCmy6yYJM6+5QdAt0DjCQq=WHE1iOwpJJHAq@mail.gmail.com> (raw)
In-Reply-To: <4D6C087B.90603@cse.iitd.ac.in>
On Mon, Feb 28, 2011 at 8:41 PM, Dushyant Bansal
<cs5070214@cse.iitd.ac.in> wrote:
> On Sunday 27 February 2011 04:19 PM, Stefan Hajnoczi wrote:
>>
>> On Sat, Feb 26, 2011 at 9:50 PM, Dushyant Bansal
>> <cs5070214@cse.iitd.ac.in> wrote:
>>>
>>> virtual size: 10G (10737418240 bytes)
>>> disk size: 569M
>>>
>>> convert-> original
>>> time 0m52.522s
>>>
>>> convert-> modified (resultant disk size: 5.3G)
>>> time 2m12.744s
>>>
>>> cp
>>> time 0m51.724s (same disk size)
>>>
>>> ---------------------------------------------------------------------------
>>> virtual size: 10G (10737418240 bytes)
>>> disk size: 3.6G
>>>
>>> convert-> original
>>> time 1m52.249s
>>>
>>> convert-> modified (resultant disk size: 7.1G)
>>> time 3m2.891s
>>>
>>> cp
>>> time 1m55.320s (same disk size)
>>>
>>> ---------------------------------------------------------------------------
>>> In these results, we can see that resultant disk size has increased.
>>>
>>
>> If I'm reading this correctly then qemu-img convert is within a few
>> seconds of cp(1) for you?
>>
>
> I have collected and attached some more time results for different
> operations on a 2.2G image.
> qemu-img convert is close to cp.
>
> qemu(modified):
> IO_BUF_SIZE = (2 * 1024 )
> if any sector is non-null, write all sectors
Nice that qemu-img convert isn't that far out by default on raw :).
About Google Summer of Code, I have posted my take on applying and
want to share that with you and qemu-devel:
http://blog.vmsplice.net/2011/03/advice-for-students-applying-to-google.html
Stefan
next prev parent reply other threads:[~2011-03-01 9:40 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-24 13:25 KVM call agenda for Jan 25 Chris Wright
2011-01-24 13:25 ` [Qemu-devel] " Chris Wright
2011-01-24 22:06 ` Anthony Liguori
2011-01-24 22:06 ` [Qemu-devel] " Anthony Liguori
2011-01-25 13:57 ` Luiz Capitulino
2011-01-25 14:02 ` Luiz Capitulino
2011-01-25 14:13 ` Stefan Hajnoczi
2011-01-25 14:13 ` Stefan Hajnoczi
2011-01-29 10:50 ` Dushyant Bansal
2011-01-29 13:16 ` Stefan Hajnoczi
2011-02-25 17:42 ` Dushyant Bansal
2011-02-26 14:05 ` Stefan Hajnoczi
2011-02-26 21:50 ` Dushyant Bansal
2011-02-27 10:49 ` Stefan Hajnoczi
2011-02-28 7:36 ` Markus Armbruster
2011-02-28 20:41 ` Dushyant Bansal
2011-03-01 9:40 ` Stefan Hajnoczi [this message]
2011-03-14 15:13 ` Dushyant Bansal
2011-03-15 10:27 ` Kevin Wolf
2011-03-16 14:17 ` Dushyant Bansal
2011-03-16 17:47 ` Stefan Hajnoczi
2011-03-17 10:07 ` Kevin Wolf
2011-03-26 21:56 ` Dushyant Bansal
2011-03-28 10:26 ` Kevin Wolf
2011-01-25 14:11 ` Aurelien Jarno
2011-01-25 14:11 ` Aurelien Jarno
2011-01-25 14:27 ` Anthony Liguori
2011-01-25 14:27 ` Anthony Liguori
2011-01-25 14:42 ` Kevin Wolf
2011-01-25 14:42 ` Kevin Wolf
2011-01-25 15:29 ` Aurelien Jarno
2011-01-25 14:26 ` Avi Kivity
2011-01-25 14:26 ` [Qemu-devel] " Avi Kivity
2011-01-25 14:35 ` Stefan Hajnoczi
2011-01-25 14:35 ` [Qemu-devel] " Stefan Hajnoczi
2011-01-26 9:58 ` Avi Kivity
2011-01-26 9:58 ` [Qemu-devel] " Avi Kivity
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