How to measure time for program running in guest OS?

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Hi,

I am running a guest OS (Fedora 16) with kvm (The host is
OpenSuse11.3), and now I have a program running inside the guest OS
and I want to measure how long the program will run. The accuracy I
need is microsecond. Since we are in the virtualization environment, I
wonder how can we measure the time duration accurately. Can anyone
give me some suggestions, thank you!!

Regards
Jidong
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