tt hits versus nodes processed

[flok]

Hi,

While trying to figure out why my multithreading implementation does not give any improvements, I noticed that the number of TT hits versus the node count does hardly change.
Is this to be expected?

Code: Select all

256MB hash						
threads	nodes	nps	tt hits	time		tthits/nodes
0	968986	567	21266	1.669		0.0219466535
1	1057584	871	23024	1.186		0.0217703747
2	1335666	754	31138	1.73		0.0233127144
3	1266007	788	29133	1.57		0.0230117211
4	1913776	648	44345	2.887		0.0231714683
5	2520574	620	63120	3.976		0.0250419151

[smatovic]

maybe you could try to run n independent threads at first,

so all counters should increase thread wise,

to be sure of proper usage of per thread memory and shared memory...

e.g., stepwise implementation of parallel search by Tom Kerrigan:

http://talkchess.com/forum/viewtopic.ph ... torder=asc

--
Srdja