On Thu, Oct 27, 2022 at 7:11 PM Wang, Wei W <wei.w.wang@xxxxxxxxx> wrote: > > On Friday, October 28, 2022 4:03 AM, Vipin Sharma wrote: > > pthread_create() will internally call sched_setaffinity() syscall after creation of a > > thread on a random CPU. So, from the performance side there is not much > > difference between the two approaches. > > The main difference I see is that the vcpu could be created on one NUMA node by > default initially and then gets pinned to another NUMA node. > pthread_create(..., &attr,...) calls clone and then sched_setaffinity(). This is not different than calling pthread_create(...,NULL,...) and then explicitly calling sched_setaffinity() by a user. vCPU creation on one NUMA node and then getting pinned to another NUMA node is equally probable in both approaches.
