-----Original Message----- From: SPDK [mailto:spdk-bounces@lists.01.org] On Behalf Of Vincent Sent: Thursday, May 30, 2019 2:34 AM To: Storage Performance Development Kit <spdk(a)lists.01.org&gt; Subject: [SPDK] The context switch rate difference between the thread created by spdk(reactor thread) and linux API pthread_create Hello all, We have an application that is developed in spdk environment. In the application we create some threads by using pthread_create API. So, in the application there are some spdk reactors threads and some threads that is create by our own. We found an interesting phenomenon, we found the spdk reactor thread is rarely swap out(context switch) And always fixed in a core to execution. But the threads created by our own is swap out frequently. We Know the API “sched_setaffinity” that can set thread to fix run on particular cpu. But it still cannot explain why the our thread is context switch frequently. So, Our problem is "How does the spdk reactor thread can achieve so low context switch rate??" Is any special setting for spdk reactor threads?? Any comment is welcome. Thank you so much _______________________________________________ SPDK mailing list SPDK(a)lists.01.org https://lists.01.org/mailman/listinfo/spdk