Breno Leitao wrote: > Nathan Lynch wrote: >> There is an "interesting" quality of POWER6 cores, which each have 2 >> hardware threads: assuming one thread on the core is idle, the primary >> thread is a little "faster" than the secondary thread. To illustrate: >> > I found this feature interesting and decided to do some tests. > After some tests I found that the example you post really runs fast in > the first CPU, but a more "elaborated" application runs slower on the > first CPU. > Here is a small example: > > # taskset 0x1 time -f "%e, %U, %S" ./a.out ; taskset 0x2 time -f "%e, > %U, %S" ./a.out > 10.77, 10.72, 0.01 > 10.53, 10.48, 0.01 > > # taskset 0x2 time -f "%e, %U, %S" ./a.out ; taskset 0x1 time -f "%e, > %U, %S" ./a.out > 10.55, 10.50, 0.01 > 10.77, 10.72, 0.01
I've been able to duplicate your results, thanks for the testcase. Guess I'll need to understand what's going on before continuing with this... _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
