diff --git a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUAsyncResourcePool.h b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUAsyncResourcePool.h
index 4533ac3fa..fe99c5c49 100644
--- a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUAsyncResourcePool.h
+++ b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUAsyncResourcePool.h
@@ -9,8 +9,6 @@
 
 namespace dipu {
 
-constexpr size_t kMaxAsyncResourcePoolLength = 3;
-
 template <class T>
 class AsyncResourcePool {
  public:
@@ -31,7 +29,11 @@ class AsyncResourcePoolImpl : public AsyncResourcePool<T> {
  public:
   void add(const T& t, std::deque<DIPUEvent>& events) override {
     std::lock_guard<mutex_t> lk(mutex_);
-    list_.emplace_back(t, std::move(events));
+    if (events.empty()) {
+      list_.emplace_front(t, std::move(events));
+    } else {
+      list_.emplace_back(t, std::move(events));
+    }
   }
 
   T get() override {
diff --git a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUBFCachingAllocator.cpp b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUBFCachingAllocator.cpp
index cd7e191f1..a13ce575d 100644
--- a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUBFCachingAllocator.cpp
+++ b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUBFCachingAllocator.cpp
@@ -7,11 +7,17 @@
 #include <utility>
 #include <vector>
 
+#include "csrc_dipu/utils/env.hpp"
+
 #include "DIPUCachingAllocator.h"
 #include "DIPUSpinMutex.h"
 
 namespace dipu {
 
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+const size_t kMaxExtendSize = get_env_or_default("DIPU_MAX_EXTEND_SIZE", 1024)
+                              << 20U;
+
 class BFCachingAllocatorImpl {
  public:
   using allocate_fn_t = std::function<void*(size_t)>;
@@ -29,7 +35,6 @@ class BFCachingAllocatorImpl {
   static constexpr size_t kMinAllocationSize = 512;
   static constexpr size_t kMaxInternalFragmentation = 8U << 20U;  // 8MB
   static constexpr size_t kMinExtendSize = 8U << 20U;             // 8MB
-  static constexpr size_t kMaxExtendSize = 1U << 30U;             // 1GB
 
   size_t cachedBytes = 0;
   size_t allocatedBytes = 0;
@@ -441,6 +446,33 @@ class BFCachingAllocator : public CacheAllocator {
     }
   }
 
+  bool try_empty_resource_pool() const {
+    using namespace std::chrono_literals;
+    std::lock_guard<mutex_t> lk(resource_pool_mutex_);
+    auto start = std::chrono::steady_clock::now();
+    constexpr auto maxWaitTime = 32us;
+    while (!async_mem_pool()->empty()) {
+      if (!async_mem_pool()->ready()) {
+        auto now = std::chrono::steady_clock::now();
+        auto elapsed = now - start;
+        if (elapsed < maxWaitTime) {
+          std::this_thread::yield();
+          continue;
+        }
+        return false;
+      }
+      const auto block = async_mem_pool()->get();
+      void* ptr = std::get<0>(block);
+      int id = static_cast<int>(std::get<1>(block));
+      DIPU_DEBUG_ALLOCATOR(
+          8, "BFCachingAllocator: " << __FUNCTION__ << " ,ptr:" << ptr
+                                    << " ,id:" << id << " ,allocator:" << this
+                                    << ", device:" << device());
+      impl->releaseRaw(ptr, id);
+    }
+    return true;
+  }
+
   void check_impl() const {
     if (impl) {
       return;
@@ -507,7 +539,7 @@ class BFCachingAllocator : public CacheAllocator {
   c10::DataPtr allocate(size_t size) const override {
     restore();
     if (async_mem_pool()->size() > kMaxAsyncResourcePoolLength) {
-      empty_resource_pool();
+      try_empty_resource_pool();
     }
     size = getMemoryAlignmentStrategy()->roundBytes(size);
     std::tuple<void*, int, size_t> block = impl->allocateRaw(size);
diff --git a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.cpp b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.cpp
index 29333f15e..fbf9c6704 100644
--- a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.cpp
+++ b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.cpp
@@ -12,12 +12,18 @@
 
 #include "csrc_dipu/base/basedef.h"
 #include "csrc_dipu/runtime/devproxy/deviceproxy.h"
+#include "csrc_dipu/utils/env.hpp"
 
 namespace dipu {
 
 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
 std::mutex DIPURawDeviceAllocator::mutex_;
 
+constexpr size_t kDefaultMaxAsyncResourcePoolLength = 64;
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+const size_t kMaxAsyncResourcePoolLength = get_env_or_default(
+    "DIPU_MAX_ASYNC_RESOURCE_POOL_LENGTH", kDefaultMaxAsyncResourcePoolLength);
+
 namespace {
 
 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
diff --git a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.h b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.h
index 87d608375..fe21919b7 100644
--- a/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.h
+++ b/dipu/torch_dipu/csrc_dipu/runtime/core/allocator/DIPUCachingAllocator.h
@@ -13,6 +13,8 @@ namespace dipu {
 
 constexpr size_t kDefaultMermoryAlignment = 512;
 
+extern const size_t kMaxAsyncResourcePoolLength;
+
 class MemoryAlignmentStrategy {
   size_t kBytesAlign = kDefaultMermoryAlignment;
   size_t alpha = 1;  // reserved
diff --git a/dipu/torch_dipu/csrc_dipu/utils/env.hpp b/dipu/torch_dipu/csrc_dipu/utils/env.hpp
new file mode 100644
index 000000000..2ad796613
--- /dev/null
+++ b/dipu/torch_dipu/csrc_dipu/utils/env.hpp
@@ -0,0 +1,18 @@
+// Copyright (c) 2024, DeepLink.
+#pragma once
+#include <sstream>
+
+namespace dipu {
+
+template <typename T>
+T get_env_or_default(const char* env_name, const T& default_value) {
+  const char* env = std::getenv(env_name);
+  if (env == nullptr) {
+    return default_value;
+  }
+  T value = default_value;
+  std::istringstream(env) >> value;
+  return value;
+}
+
+}  // namespace dipu