wkcn commented on a change in pull request #14363: Support multi-threading for
Custom Operator
URL: https://github.com/apache/incubator-mxnet/pull/14363#discussion_r263666113
##########
File path: src/operator/custom/custom-inl.h
##########
@@ -139,38 +142,52 @@ class CustomOperator {
destructing_ = true;
cv_.notify_all();
}
- worker_.join();
+ for (auto &worker : workers_)
+ worker.join();
}
static CustomOperator* Get();
private:
- CustomOperator() {
+ CustomOperator() : num_free_threads(0) {
destructing_ = false;
naive_engine_ = true;
if (std::string("NaiveEngine") != dmlc::GetEnv("MXNET_ENGINE_TYPE",
std::string())) {
naive_engine_ = false;
- worker_ = std::thread(
- [&]() {
- std::unique_lock<std::mutex> lock(mutex_);
- while (!q_.empty() || !destructing_) {
- cv_.wait(lock, [&] {return !q_.empty() || destructing_;});
- while (!q_.empty()) {
- auto fn = q_.front();
- lock.unlock();
- fn();
- lock.lock();
- q_.pop();
- }
- }
- });
+ SetNumThreads(1);
+ }
+ }
+ void ThreadTarget() {
+ std::unique_lock<std::mutex> lock(mutex_);
+ while (!q_.empty() || !destructing_) {
+ cv_.wait(lock, [&] {return !q_.empty() || destructing_;});
+ while (!q_.empty()) {
+ --num_free_threads;
+ auto fn = q_.front();
+ q_.pop();
+ lock.unlock();
+ fn();
+ ++num_free_threads;
+ lock.lock();
+ }
+ }
+ }
+ void SetNumThreads(int num_threads) {
+ num_threads = std::min(dmlc::GetEnv("MXNET_CUSTOM_OP_NUM_THREADS", 16),
num_threads);
Review comment:
MXNET_CUSTOM_OP_NUM_THREADS is the maximum number of threads for custom
operator. When threads are not enough, it will create new threads until the
number of threads reaches MXNET_CUSTOM_OP_NUM_THREADS.
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