diff --git a/src/core/impl/comp_node/atlas/comp_node.cpp b/src/core/impl/comp_node/atlas/comp_node.cpp
index ab71e0ad31c353ff346f026f061e212b22f4f5c1..7c03c8f004e2ba9ed8aa2ee3fb0009636f0485cb 100644
--- a/src/core/impl/comp_node/atlas/comp_node.cpp
+++ b/src/core/impl/comp_node/atlas/comp_node.cpp
@@ -420,7 +420,7 @@ CompNode::Impl* AtlasCompNode::load_atlas(const Locator& locator,
     for (int i = 0; i < sd.nr_node; ++i) {
         auto&& cur = sd.node[i];
         if (cur.m_initialized) {
-            if (cur.m_locator_logical == locator_logical) {
+            if (cur.m_locator == locator && cur.m_locator_logical == locator_logical) {
                 return &cur;
             }
         } else {
diff --git a/src/core/impl/comp_node/cambricon/comp_node.cpp b/src/core/impl/comp_node/cambricon/comp_node.cpp
index c7f9da35188d46d8fcea2c53cae04bee41f32dc9..9da1494a2cdd0a489298c0b1532bcf8682342078 100644
--- a/src/core/impl/comp_node/cambricon/comp_node.cpp
+++ b/src/core/impl/comp_node/cambricon/comp_node.cpp
@@ -604,7 +604,7 @@ CompNode::Impl* CambriconCompNode::load_cambricon(
     for (int i = 0; i < sd.nr_node; ++i) {
         auto&& cur = sd.node[i];
         if (cur.m_initialized) {
-            if (cur.m_locator_logical == locator_logical) {
+            if (cur.m_locator == locator && cur.m_locator_logical == locator_logical) {
                 return &cur;
             }
         } else {
diff --git a/src/core/impl/comp_node/comp_node.cpp b/src/core/impl/comp_node/comp_node.cpp
index c276cac980b03dcdb0e2c8148bb9c58b69eba57e..725eb3832762c4811f4725fba5a2ec795be55d7f 100644
--- a/src/core/impl/comp_node/comp_node.cpp
+++ b/src/core/impl/comp_node/comp_node.cpp
@@ -250,6 +250,10 @@ void CompNode::Locator::set_device_map(DeviceType type, int from, int to) {
 
 void CompNode::Locator::set_unspec_device_type(DeviceType type) {
     mgb_assert(type != DeviceType::UNSPEC);
+    if (type != DeviceType::CPU && type != DeviceType::CUDA) {
+        mgb_log_warn("to resolve unspec device type as one except "
+                "CUDA and CPU may lead to unknown problems.");
+    }
     g_unspec_locator_type = type;
 }
 
diff --git a/src/core/impl/comp_node/cpu/comp_node.cpp b/src/core/impl/comp_node/cpu/comp_node.cpp
index c639e992ad3e0403f37af071412af11c3da1ef22..140a8cec4783a59ec447139db4fe7a469bef19b1 100644
--- a/src/core/impl/comp_node/cpu/comp_node.cpp
+++ b/src/core/impl/comp_node/cpu/comp_node.cpp
@@ -723,12 +723,13 @@ struct CpuCompNode::Pool {
         impl_storage[MAX_NR_COMP_NODE];
     size_t nr_used_impl_storage = 0;
 
-    ThinHashMap<std::pair<int, int>,
-        std::unique_ptr<CpuCompNodeImpl, CpuCompNodeImplDeleter>> logical2impl;
+    std::unordered_map<CompNode::LocatorPairHashKey,
+            std::unique_ptr<CpuCompNodeImpl, CpuCompNodeImplDeleter>,
+            CompNode::LocatorPairHashKey::Hash> locator2impl;
     ThinHashMap<std::pair<int, int>, std::weak_ptr<WorkerQueue>> physical2queue;
-    ThinHashMap<std::pair<int, int>,
-                std::unique_ptr<CpuCompNodeImpl, CpuCompNodeImplDeleter>>
-            logical2impl_multi_thread;
+    std::unordered_map<CompNode::LocatorPairHashKey,
+            std::unique_ptr<CpuCompNodeImpl, CpuCompNodeImplDeleter>,
+            CompNode::LocatorPairHashKey::Hash> locator2impl_multi_thread;
     ThinHashMap<std::pair<int, int>, std::weak_ptr<WorkerQueue>>
             physical2queue_multithead;
 };
@@ -792,14 +793,9 @@ CpuCompNode::Impl* CpuCompNode::load_cpu(Locator locator,
     MGB_LOCK_GUARD(sm_pool->mtx);
 
     // encode both device ID and type into a int
-    int compact_logical_device = locator_logical.device;
-    mgb_assert(compact_logical_device >= -1 ||
-               compact_logical_device <= Locator::DEVICE_CPU_DEFAULT);
-    if (locator_logical.type == CompNode::DeviceType::UNSPEC) {
-        compact_logical_device += std::numeric_limits<int>::min() + 1;
-        mgb_assert(compact_logical_device <
-                   Locator::DEVICE_MULTITHREAD_DEFAULT);
-    } else {
+    mgb_assert(locator_logical.device >= -1 ||
+               locator_logical.device <= Locator::DEVICE_CPU_DEFAULT);
+    if (locator_logical.type != CompNode::DeviceType::UNSPEC) {
         mgb_assert(locator_logical.type == CompNode::DeviceType::CPU ||
                    locator_logical.type == CompNode::DeviceType::MULTITHREAD);
     }
@@ -811,8 +807,8 @@ CpuCompNode::Impl* CpuCompNode::load_cpu(Locator locator,
             pqueue = std::make_shared<WorkerQueue>(locator);
             pqueue_weak = pqueue;
         }
-        auto&& pimpl = sm_pool->logical2impl[{compact_logical_device,
-                                              locator_logical.stream}];
+        auto&& pimpl = sm_pool->locator2impl[{locator,
+                                              locator_logical}];
         if (!pimpl) {
             mgb_assert(sm_pool->nr_used_impl_storage < Pool::MAX_NR_COMP_NODE,
                        "too many cpu comp nodes; max %d allowed",
@@ -833,8 +829,8 @@ CpuCompNode::Impl* CpuCompNode::load_cpu(Locator locator,
             pqueue = std::make_shared<WorkerQueue>(locator);
             pqueue_weak = pqueue;
         }
-        auto&& pimpl = sm_pool->logical2impl_multi_thread[{
-                compact_logical_device, locator_logical.nr_threads}];
+        auto&& pimpl = sm_pool->locator2impl_multi_thread[{
+                locator, locator_logical}];
         if (!pimpl) {
             mgb_assert(sm_pool->nr_used_impl_storage < Pool::MAX_NR_COMP_NODE,
                        "too many cpu multithread comp nodes; max %d allowed",
@@ -854,9 +850,9 @@ void CpuCompNode::sync_all() {
         return;
 
     MGB_LOCK_GUARD(sm_pool->mtx);
-    for (auto &&i: sm_pool->logical2impl)
+    for (auto &&i: sm_pool->locator2impl)
         i.second->sync();
-    for (auto&& i : sm_pool->logical2impl_multi_thread)
+    for (auto&& i : sm_pool->locator2impl_multi_thread)
         i.second->sync();
 }
 
diff --git a/src/core/impl/comp_node/cuda/comp_node.cpp b/src/core/impl/comp_node/cuda/comp_node.cpp
index dcfe549d47b8ea2973e1f084e92ad8c366ef3537..83804687970637799dda9e57ab06bba7902b5e4d 100644
--- a/src/core/impl/comp_node/cuda/comp_node.cpp
+++ b/src/core/impl/comp_node/cuda/comp_node.cpp
@@ -718,7 +718,7 @@ CompNode::Impl* CudaCompNode::load_cuda(
     for (int i = 0; i < sd.nr_node; ++ i) {
         auto &&cur = sd.node[i];
         if (cur.m_initialized) {
-            if (cur.m_locator_logical == locator_logical) {
+            if (cur.m_locator == locator && cur.m_locator_logical == locator_logical) {
                 return &cur;
             }
         } else {
diff --git a/src/core/impl/comp_node/rocm/comp_node.cpp b/src/core/impl/comp_node/rocm/comp_node.cpp
index c7300b39167d33f461d81d1a8b370649ae557156..07a53d7a665f90f82fd1faa27df27b22cbebbfe6 100644
--- a/src/core/impl/comp_node/rocm/comp_node.cpp
+++ b/src/core/impl/comp_node/rocm/comp_node.cpp
@@ -606,7 +606,7 @@ CompNode::Impl* ROCmCompNode::load_rocm(const Locator& locator,
     for (int i = 0; i < sd.nr_node; ++i) {
         auto&& cur = sd.node[i];
         if (cur.m_initialized) {
-            if (cur.m_locator_logical == locator_logical) {
+            if (cur.m_locator == locator && cur.m_locator_logical == locator_logical) {
                 return &cur;
             }
         } else {
diff --git a/src/core/include/megbrain/comp_node.h b/src/core/include/megbrain/comp_node.h
index 464235f8316fd6d5bad498e3e1f649a57425be05..2ff854495db00056a2ce01160f4136f575660595 100644
--- a/src/core/include/megbrain/comp_node.h
+++ b/src/core/include/megbrain/comp_node.h
@@ -168,6 +168,22 @@ class CompNode {
                 return type == rhs.type && device == rhs.device &&
                     stream == rhs.stream;
             }
+
+        };
+
+        struct LocatorPairHashKey {
+            Locator locator, locator_logical;
+
+            bool operator==(const LocatorPairHashKey& rhs) const {
+                return locator == rhs.locator && locator_logical == rhs.locator_logical;
+            }
+
+            struct Hash {
+                size_t operator()(const LocatorPairHashKey& k) const {
+                    return hash_pair_combine(mgb::hash(k.locator),
+                                             mgb::hash(k.locator_logical));
+                }
+            };
         };
 
         //! predefined special streams
@@ -537,6 +553,7 @@ class CompNode {
 
         friend class CompNodeEnv;
         friend struct HashTrait<CompNode>;
+        friend struct HashTrait<CompNode::Locator>;
         friend class CompNodeImplHelper;
     public:
         CompNode(ImplBase* impl) : m_impl{impl} {}
@@ -686,6 +703,15 @@ struct HashTrait<CompNode> {
     }
 };
 
+template<>
+struct HashTrait<CompNode::Locator> {
+    static size_t eval(const CompNode::Locator &val) {
+        return static_cast<size_t>(val.device)
+            + (static_cast<size_t>(val.type) << 4)
+            + (static_cast<size_t>(val.stream) << 8);
+    }
+};
+
 namespace comp_node_detail {
 
 /*!
diff --git a/src/core/test/comp_node.cpp b/src/core/test/comp_node.cpp
index 1ad42db74f0dbb1a6ee321e19de545d199d267fc..dc042b2e1cfced4450bf6ee908f3cc0cac645c54 100644
--- a/src/core/test/comp_node.cpp
+++ b/src/core/test/comp_node.cpp
@@ -86,19 +86,34 @@ TEST(TestCompNode, SetDefaultDev) {
     CompNode::finalize();
     using L = CompNode::Locator;
     auto orig_dt = L::parse("xpu").to_physical(),
-         orig_gpu = L::parse("gpux").to_physical();
+         orig_gpu = L::parse("gpux").to_physical(),
+         orig_cpu = L::parse("cpux").to_physical();
     constexpr auto CUDA = CompNode::DeviceType::CUDA;
+    constexpr auto CPU = CompNode::DeviceType::CPU;
     L::set_unspec_device_type(CUDA);
-    L::set_device_map(CUDA, -1, 2);
-    auto run = []() {
-        ASSERT_EQ(CompNode::load("xpu").locator(), L::parse("gpu2"));
+
+    auto run = [](int device) {
+        ASSERT_EQ(CompNode::load("xpu").locator(),
+                L::parse("gpu" + std::to_string(device)));
+    };
+    auto run_cpu = [](int device) {
+        ASSERT_EQ(CompNode::load("cpux").locator(),
+                L::parse("cpu" + std::to_string(device)));
     };
 
     MGB_TRY {
-        run();
+        L::set_device_map(CUDA, -1, 2);
+        run(2);
+        L::set_device_map(CUDA, -1, 1);
+        run(1);
+        L::set_device_map(CPU, -1, 2);
+        run_cpu(2);
+        L::set_device_map(CPU, -1, 1);
+        run_cpu(1);
     } MGB_FINALLY({
         L::set_unspec_device_type(orig_dt.type);
         L::set_device_map(CUDA, -1, orig_gpu.device);
+        L::set_device_map(CPU, -1, orig_cpu.device);
     });
     CompNode::finalize();
 }