This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


RE: [Xen-users] performance degradation of xen

To: "xc l" <nudtxcl@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] performance degradation of xen
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Wed, 11 May 2011 22:20:46 +1000
Delivery-date: Wed, 11 May 2011 05:21:45 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <BANLkTimi3_0m7pKkwCUZDE8JcVYji9-B6w@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <BANLkTimi3_0m7pKkwCUZDE8JcVYji9-B6w@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcwP1U9swfQibNiFR2aoUlSh07/0GgAAFfdw
Thread-topic: [Xen-users] performance degradation of xen
> 1.I divide my desktop(2 processors ,2G memory) into two VMs(each
entirely owns
> 1 processor ,1G memory).Then I run two tasks
simultaneously(task0,task1, they
> are independent to each other) on these two VMS,the time consumed is
> 2.I run the same two tasks simultaneously straightly on the
desktop,and the
> time consumed is T1.
> I found that T1 is always 2 times as T0.Is this result common or is
there any
> papers(reports) illustrates this kind of question?

If the two tasks are CPU bound and you half the amount of CPU you give
to them (eg by running them on the same VM instead of separate VM's)
then you will roughly double the required runtime. Is that what you were
doing in #2 or have I misunderstood?


Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>