Petr Baudis wrote: > This is not what I see; for me and Pachi, i7 performs about 15% faster > than Core2 in single thread. This is "Q9300 @ 2.50GHz" vs. "i7 920 @ > 2.67GHz" so the clock difference certainly is not the sole reason.
Did you disable turbo on the i7? If not, it's likely to be running at 2.8GHz (the TSC still ticks at 2.67 GHz, so libego's kpps/GHz calculation doesn't take this into account). > Pachi: > > [i7] 2.3kpps > [core2] 1.9kpps > So pachi likes Nehalem a bit better than core 2. That isn't surprising: these look like much heavier playouts than the ultra-light ones I was measuring. Is this just playouts, or tree too? > I also just did a quick test with latest libego: > > [i7] > 27.2497 kpps > 10.2013 kpps/GHz (clock independent) > > [core2] > 23.043 kpps > 9.26901 kpps/GHz (clock independent) > ...and Erik's ancient libego build: > > [i7] > Performance: > 1000000 playouts > 7.69283 seconds > 129.991 kpps > > [core2] > Performance: > 1000000 playouts > 8.46945 seconds > 118.071 kpps If turbo is on, these two look like equal performance per (real) clock tick. The 'ancient' one closely matches the i7 performance I get from a 2008 libego build, but I got rather higher core2 performance. Perhaps just different compiler behaviour. -M- _______________________________________________ Computer-go mailing list [email protected] http://dvandva.org/cgi-bin/mailman/listinfo/computer-go
