Re: [Coremu-list-devel] How do you measure timing on COREMU?

[Chen Y. <cyf...@gm...>]

We implemented 2 versions of time measurement in x86 guest application,

- gettimeofday
- rdtsc


When the emulated core is less then available physical cores, the time reported by the both time measurement are almost the same.  

--
Best regards,
Chen Yufei


On 2012年5月22日Tuesday at 下午2:12, 陳韋任 wrote:

> On Tue, May 22, 2012 at 02:05:57PM +0800, zhaoguo wang wrote:
> > Arm can just emulate up to 4 core.
> > When the number of cores emulated by COREMU is not more than the number of
> > physical cpus, time is correct.
> > So for Arm emulation, we don't use rdtsc.  
>  
>  
>  
> You mean the result of `time` is correct under the prerequisite tou mentioned?
> How do you know it's correct, I mean any golden standard you compare with?
>  
> Thanks. ;)
>  
> Regards,
> chenwj
>  
> --  
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>  
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