On 05/24/2014 01:55 PM, Graeme Geldenhuys wrote:
...
Finally I found that using theTSC supposedly in fact will not work
reliabbly in SMP systems (which are ubiquitous right now).
http://linux.die.net/man/3/clock_gettime :
NOTE for SMP systems
The CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID clocks are
realized on many platforms using timers from the CPUs (TSC on i386,
AR.ITC on Itanium). These registers may differ between CPUs and as a
consequence these clocks may return bogus results if a process is
migrated to another CPU.
.-Michael
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