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accurate C++ timer

accurate C++ timer# Programming - 葵花宝典

i*s2008-02-21 08:02

1 楼

Anyone knows how to make an accurate C++ timer,
one that is accurate and not susceptible to
multi-core and CPU stepping, etc.? Thanks!

x*h2008-02-21 08:02

2 楼

Absolutely accurate c++ timer cannot be got at windows and linux.
In windows, try to use queryperformance*()
sorry, I cannot remember exact function name.

i*s2008-02-21 08:02

3 楼

Then what is the most accurate method under Linux?
With the rdtsc instruction, we can get cycles, but
it's not working with CPU stepping.
How is gettimeofday() implemented?

【在 x*********h 的大作中提到】

: Absolutely accurate c++ timer cannot be got at windows and linux.
: In windows, try to use queryperformance*()
: sorry, I cannot remember exact function name.

p*o2008-02-21 08:02

4 楼

getrusage?

【在 i*****s 的大作中提到】

:
: Then what is the most accurate method under Linux?
: With the rdtsc instruction, we can get cycles, but
: it's not working with CPU stepping.
: How is gettimeofday() implemented?

x*h2008-02-21 08:02

5 楼

search
linux queryperformancecount
you may get
http://code.google.com/p/winx/issues/detail?id=8
http://fixunix.com/ms-dos/22081-converting-intel-code.html