I haven't tried it but according to various links, GetSystemTime() only gives ~10ms or ~15ms precision
Thank you for the links! Some results looks bizarre tho, like timeGetTime() at the same level than GetTickCount() seems quite weird to me. The graphs also seems to indicate QPC has one of the largest call overhead, would it be a concern ? Anyway, this makes me wonder what is the rational behind using GetSystemTimeAsFileTime() to implement date_time::microsec_clock ? Does anyone know (or could an author entlighten us) ? This also raise another question, if we chose to implement microsec_timer with QPC, what will we name the timer implemented with posix_time::microsec_clock (which is just a typedef for date_time::microsec_clock) ? Philippe