Darren, > Do you have more details
x86 64 bits, 32 GB ram, about 1500 playouts/s/core at the beginning of a 19x19 game. > effiency (actual playouts/second/core compared to pachi running > on just one of the cores) I have not measured it but it should be close to 100% with your definition of efficiency since the tree is not locked. However I think that this definition is not the most useful one since it doesn't say anything about playing strength. Pasky and I are preparing a new paper which includes a section on scalability (both on a single machine and in distributed mode), which should answer your questions. In short scalability on a single machine is very good and scalability on multiple machines is hard but we are making progress there. In the past I couldn't get performance improvements beyond 10 machines. Now I can get improvements in playing strength up to 64 machines but 128 machines don't perform better than 64. Jean-loup
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