tqchen commented on a change in pull request #4344: [ThreadPool] Solve thread
transitions issue
URL: https://github.com/apache/incubator-tvm/pull/4344#discussion_r348122833
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File path: src/runtime/threading_backend.cc
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@@ -134,21 +134,28 @@ class ThreadGroup::Impl {
#endif
}
if (exclude_worker0) { // bind the master thread to core 0
- cpu_set_t cpuset;
- CPU_ZERO(&cpuset);
if (reverse) {
- CPU_SET(sorted_order_[sorted_order_.size() - 1], &cpuset);
+ core0_id_ = sorted_order_[sorted_order_.size() - 1];
} else {
- CPU_SET(sorted_order_[0], &cpuset);
+ core0_id_ = sorted_order_[0];
}
+ pthread_atfork(nullptr, nullptr,
ThreadGroup::Impl::BindMasterThreadToCore0);
+ }
+#endif
+ }
+
+ static void BindMasterThreadToCore0() {
+#if defined(__linux__) || defined(__ANDROID__)
+ cpu_set_t cpuset;
+ CPU_ZERO(&cpuset);
Review comment:
OK, I was thinking about the other way.
- the process can bind the master thread if we want(by default we don't have
to)
- Release the binding of the threads at fork(by bind to all cores), so the
child thread can freely move around using whatever cores they like
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