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--- a/src/core/lib/event_engine/thread_pool.cc (e2ca673ad16f4cb0e0e81da057545ef9583bd947)
+++ b/src/core/lib/event_engine/thread_pool.cc (working tree)
@@ -34,9 +34,30 @@
#include "src/core/lib/gprpp/thd.h"
#include "src/core/lib/gprpp/time.h"
+namespace {
+ size_t threads_limit_ = 0;
+}
+
namespace grpc_event_engine {
namespace experimental {
+size_t ThreadPool::SetThreadsLimit(size_t count) {
+ size_t prev = threads_limit_;
+ threads_limit_ = count;
+ return prev;
+}
+
+unsigned ThreadPool::GetMaxSystemThread() {
+ unsigned max_threads = grpc_core::Clamp(gpr_cpu_num_cores(), 2u, 32u);
+
+ if (threads_limit_) {
+ unsigned new_max_threads = std::min(max_threads, static_cast<unsigned>(threads_limit_));
+ gpr_log(GPR_INFO, "Threads limit changed from %u to %u", max_threads, new_max_threads);
+ max_threads = new_max_threads;
+ }
+ return max_threads;
+}
+
void ThreadPool::StartThread(StatePtr state, StartThreadReason reason) {
state->thread_count.Add();
const auto now = grpc_core::Timestamp::Now();
--- a/src/core/lib/event_engine/thread_pool.h (e2ca673ad16f4cb0e0e81da057545ef9583bd947)
+++ b/src/core/lib/event_engine/thread_pool.h (working tree)
@@ -62,6 +62,9 @@ class ThreadPool final : public Forkable, public Executor {
// Returns true if the current thread is a thread pool thread.
static bool IsThreadPoolThread();
+ // Set the maximum numbers of treads for threadpool
+ static size_t SetThreadsLimit(size_t count);
+
private:
class Queue {
public:
@@ -129,8 +132,9 @@ class ThreadPool final : public Forkable, public Executor {
static void StartThread(StatePtr state, StartThreadReason reason);
void Postfork();
- const unsigned reserve_threads_ =
- grpc_core::Clamp(gpr_cpu_num_cores(), 2u, 32u);
+ unsigned GetMaxSystemThread();
+
+ const unsigned reserve_threads_ = GetMaxSystemThread();
const StatePtr state_ = std::make_shared<State>(reserve_threads_);
std::atomic<bool> quiesced_{false};
};
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