Brice >Can you print the pattern before and after thread 1 touched its pages, or even >in the middle ? >It looks like somebody is touching too many pages here.
Experimenting with different threads touching one or more pages, I get unpredicatable results here on the 8 numa node device, the result is perfect. I am only allowing thread 3 and 7 to write a single memory location get_numa_domain() 8 Domain Numa pattern -------- -------- -------- 3------- -------- -------- -------- 7------- ============================ ============================ Contents of memory locations 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 26 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 63 0 0 0 0 0 0 0 ============================ you can see that core 26 (numa domain 3) wrote to memory, and so did core 63 (domain 8) Now I run it a second time and look, its rubbish get_numa_domain() 8 Domain Numa pattern 3------- 3------- 3------- 3------- 3------- 3------- 3------- 3------- ============================ ============================ Contents of memory locations 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 26 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 63 0 0 0 0 0 0 0 ============================ after allowing the data to be read by a random thread 37777777 37777777 37777777 37777777 37777777 37777777 37777777 37777777 I'm baffled. JB _______________________________________________ hwloc-users mailing list hwloc-users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/hwloc-users
