> It seems sensible the more CPU we get in the cluster, the more > we need the kernel to be aware of its existence. > > Tim, it is possible for you to bring up the cpu_cluster_mask and > cluster_sibling for x86 so that the topology can be represented > in sysfs and be used by scheduler? It seems your patch lacks this > part. You mean having something in /sys/devices/system/cpu/cpu0/topology on cluster information so that an external program can affinitize to a cluster if it prefers to do so? Tim > > BTW, I wonder if x86 can do some improvement on your KMP_AFFINITY > by leveraging the cluster topology level. > https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/optimization-and-programming-guide/openmp-support/openmp-library-support/thread-affinity-interface-linux-and-windows.html > > KMP_AFFINITY has thread affinity modes like compact and scatter, > it seems this "compact" and "scatter" can also use the cluster > information as you see we are also struggling with the "compact" > and "scatter" issues here in this patchset :-) > > Thanks > Barry >
