[Xen-devel] question about VM outperforms physical machine on a

To:	Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] question about VM outperforms physical machine on a micro benchmark
From:	xuehai zhang <hai@xxxxxxxxxxxxxxx>
Date:	Tue, 22 Nov 2005 16:56:54 -0600
Cc:	Tim Freeman <tfreeman@xxxxxxxxxxx>, Kate Keahey <keahey@xxxxxxxxxxx>
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Dear all,

I ran a small program to test the popen() function call performance on both a VM and a physicalmachine. The program just does a loop of popen() for 20 times and records the total execution time.The host of the VM has the same hardware configurations as the physical machine. The VM and thephysical machine both have 2.6.11 kernel. The 20 popen() loops run for 0.453s on VM 0.690s on thephysical machine. I will appreciate if you give me some insight of what cause the disparity.

Thanks in advance for your help.

Best,
Xuehai


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