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>         CPU_ZERO(m_cpus); >         for (int i = 0; i < m_threads; ++i) { >                 CPU_SET(i, m_cpus); >                 CPU_CLR(i, w_cpus); >         } >         for (; i < CPU_SETSIZE; i++) {             << here i refers to > the one in scope. which is 0. Hence w_cpus is set for all cpus. >                                                       And hence workers > end up running on all CPUs even with -W auto >                 CPU_SET(i, w_cpus); >         } Oh, you're exactly right. Fixing this up, thanks. I'll do some runs to see if this changes things on my test boxes as well. > > > Another issue, is that if CPU0 if offline, then auto pinning fails. > Maybe no one cares about that case? The auto pinning is pretty simple right now, I'm planning on making it numa/ccx aware. Are CPUs offline enough on test systems that we want to worry about that? -chris