diff --git a/core/src/scheduler/selector/BuildIndexPass.cpp b/core/src/scheduler/selector/BuildIndexPass.cpp
index 42a0736b0f..4047f2b999 100644
--- a/core/src/scheduler/selector/BuildIndexPass.cpp
+++ b/core/src/scheduler/selector/BuildIndexPass.cpp
@@ -47,13 +47,9 @@ BuildIndexPass::Run(const TaskPtr& task) {
             LOG_SERVER_WARNING_ << "BuildIndexPass cannot get build index gpu!";
             return false;
         }
-
-        if (specified_gpu_id_ >= build_gpus_.size()) {
-            specified_gpu_id_ = specified_gpu_id_ % build_gpus_.size();
-        }
-        LOG_SERVER_DEBUG_ << "Specify gpu" << specified_gpu_id_ << " to build index!";
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, build_gpus_[specified_gpu_id_]);
-        specified_gpu_id_ = (specified_gpu_id_ + 1) % build_gpus_.size();
+        LOG_SERVER_DEBUG_ << "Specify gpu" << build_gpus_[idx_] << " to build index!";
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, build_gpus_[idx_]);
+        idx_ = (idx_ + 1) % build_gpus_.size();
     }
 
     auto label = std::make_shared<SpecResLabel>(std::weak_ptr<Resource>(res_ptr));
diff --git a/core/src/scheduler/selector/BuildIndexPass.h b/core/src/scheduler/selector/BuildIndexPass.h
index 7f3b8047fc..220ac69049 100644
--- a/core/src/scheduler/selector/BuildIndexPass.h
+++ b/core/src/scheduler/selector/BuildIndexPass.h
@@ -40,7 +40,7 @@ class BuildIndexPass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    uint64_t specified_gpu_id_ = 0;
+    uint64_t idx_ = 0;
 };
 
 using BuildIndexPassPtr = std::shared_ptr<BuildIndexPass>;
diff --git a/core/src/scheduler/selector/FaissFlatPass.cpp b/core/src/scheduler/selector/FaissFlatPass.cpp
index c3b86ee99b..01b21b9a14 100644
--- a/core/src/scheduler/selector/FaissFlatPass.cpp
+++ b/core/src/scheduler/selector/FaissFlatPass.cpp
@@ -61,11 +61,10 @@ FaissFlatPass::Run(const TaskPtr& task) {
                                     "search", 0);
         res_ptr = ResMgrInst::GetInstance()->GetResource("cpu");
     } else {
-        auto best_device_id = count_ % search_gpus_.size();
-        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissFlatPass: nq > gpu_search_threshold, specify gpu %d to search!",
-                                    "search", 0, best_device_id);
-        ++count_;
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[best_device_id]);
+        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissFlatPass: nq >= gpu_search_threshold, specify gpu %d to search!",
+                                    "search", 0, search_gpus_[idx_]);
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[idx_]);
+        idx_ = (idx_ + 1) % search_gpus_.size();
     }
     auto label = std::make_shared<SpecResLabel>(res_ptr);
     task->label() = label;
diff --git a/core/src/scheduler/selector/FaissFlatPass.h b/core/src/scheduler/selector/FaissFlatPass.h
index a1ebeb9b47..54231c4b16 100644
--- a/core/src/scheduler/selector/FaissFlatPass.h
+++ b/core/src/scheduler/selector/FaissFlatPass.h
@@ -41,7 +41,7 @@ class FaissFlatPass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    int64_t count_ = 0;
+    int64_t idx_ = 0;
 };
 
 using FaissFlatPassPtr = std::shared_ptr<FaissFlatPass>;
diff --git a/core/src/scheduler/selector/FaissIVFFlatPass.cpp b/core/src/scheduler/selector/FaissIVFFlatPass.cpp
index 6ba62b3a0c..25ea7f0f49 100644
--- a/core/src/scheduler/selector/FaissIVFFlatPass.cpp
+++ b/core/src/scheduler/selector/FaissIVFFlatPass.cpp
@@ -62,11 +62,10 @@ FaissIVFFlatPass::Run(const TaskPtr& task) {
                                     "search", 0);
         res_ptr = ResMgrInst::GetInstance()->GetResource("cpu");
     } else {
-        auto best_device_id = count_ % search_gpus_.size();
-        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFFlatPass: nq > gpu_search_threshold, specify gpu %d to search!",
-                                    "search", 0, best_device_id);
-        count_++;
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[best_device_id]);
+        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFFlatPass: nq >= gpu_search_threshold, specify gpu %d to search!",
+                                    "search", 0, search_gpus_[idx_]);
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[idx_]);
+        idx_ = (idx_ + 1) % search_gpus_.size();
     }
     auto label = std::make_shared<SpecResLabel>(res_ptr);
     task->label() = label;
diff --git a/core/src/scheduler/selector/FaissIVFFlatPass.h b/core/src/scheduler/selector/FaissIVFFlatPass.h
index dda315c64a..2c1b4e7ebb 100644
--- a/core/src/scheduler/selector/FaissIVFFlatPass.h
+++ b/core/src/scheduler/selector/FaissIVFFlatPass.h
@@ -41,7 +41,7 @@ class FaissIVFFlatPass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    int64_t count_ = 0;
+    int64_t idx_ = 0;
 };
 
 using FaissIVFFlatPassPtr = std::shared_ptr<FaissIVFFlatPass>;
diff --git a/core/src/scheduler/selector/FaissIVFPQPass.cpp b/core/src/scheduler/selector/FaissIVFPQPass.cpp
index de213f4079..32acc0c4bc 100644
--- a/core/src/scheduler/selector/FaissIVFPQPass.cpp
+++ b/core/src/scheduler/selector/FaissIVFPQPass.cpp
@@ -64,11 +64,10 @@ FaissIVFPQPass::Run(const TaskPtr& task) {
                                     "search", 0);
         res_ptr = ResMgrInst::GetInstance()->GetResource("cpu");
     } else {
-        auto best_device_id = count_ % search_gpus_.size();
-        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFPQPass: nq > gpu_search_threshold, specify gpu %d to search!",
-                                    "search", 0, best_device_id);
-        ++count_;
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[best_device_id]);
+        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFPQPass: nq >= gpu_search_threshold, specify gpu %d to search!",
+                                    "search", 0, search_gpus_[idx_]);
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[idx_]);
+        idx_ = (idx_ + 1) % search_gpus_.size();
     }
     auto label = std::make_shared<SpecResLabel>(res_ptr);
     task->label() = label;
diff --git a/core/src/scheduler/selector/FaissIVFPQPass.h b/core/src/scheduler/selector/FaissIVFPQPass.h
index f4fca581d2..b4fa296537 100644
--- a/core/src/scheduler/selector/FaissIVFPQPass.h
+++ b/core/src/scheduler/selector/FaissIVFPQPass.h
@@ -41,7 +41,7 @@ class FaissIVFPQPass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    int64_t count_ = 0;
+    int64_t idx_ = 0;
 };
 
 using FaissIVFPQPassPtr = std::shared_ptr<FaissIVFPQPass>;
diff --git a/core/src/scheduler/selector/FaissIVFSQ8HPass.cpp b/core/src/scheduler/selector/FaissIVFSQ8HPass.cpp
index e1f79a1650..7dc3546ef0 100644
--- a/core/src/scheduler/selector/FaissIVFSQ8HPass.cpp
+++ b/core/src/scheduler/selector/FaissIVFSQ8HPass.cpp
@@ -62,11 +62,10 @@ FaissIVFSQ8HPass::Run(const TaskPtr& task) {
                                     "search", 0);
         res_ptr = ResMgrInst::GetInstance()->GetResource("cpu");
     } else {
-        auto best_device_id = count_ % search_gpus_.size();
-        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFSQ8HPass: nq > gpu_search_threshold, specify gpu %d to search!",
-                                    "search", 0, best_device_id);
-        ++count_;
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[best_device_id]);
+        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFSQ8HPass: nq >= gpu_search_threshold, specify gpu %d to search!",
+                                    "search", 0, search_gpus_[idx_]);
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[idx_]);
+        idx_ = (idx_ + 1) % search_gpus_.size();
     }
     auto label = std::make_shared<SpecResLabel>(res_ptr);
     task->label() = label;
diff --git a/core/src/scheduler/selector/FaissIVFSQ8HPass.h b/core/src/scheduler/selector/FaissIVFSQ8HPass.h
index c9da0f5829..1050352c01 100644
--- a/core/src/scheduler/selector/FaissIVFSQ8HPass.h
+++ b/core/src/scheduler/selector/FaissIVFSQ8HPass.h
@@ -41,7 +41,7 @@ class FaissIVFSQ8HPass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    int64_t count_ = 0;
+    int64_t idx_ = 0;
 };
 
 using FaissIVFSQ8HPassPtr = std::shared_ptr<FaissIVFSQ8HPass>;
diff --git a/core/src/scheduler/selector/FaissIVFSQ8Pass.cpp b/core/src/scheduler/selector/FaissIVFSQ8Pass.cpp
index 28a210a61b..c93adbfbe4 100644
--- a/core/src/scheduler/selector/FaissIVFSQ8Pass.cpp
+++ b/core/src/scheduler/selector/FaissIVFSQ8Pass.cpp
@@ -62,11 +62,10 @@ FaissIVFSQ8Pass::Run(const TaskPtr& task) {
                                     "search", 0);
         res_ptr = ResMgrInst::GetInstance()->GetResource("cpu");
     } else {
-        auto best_device_id = count_ % search_gpus_.size();
-        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFSQ8Pass: nq > gpu_search_threshold, specify gpu %d to search!",
-                                    "search", 0, best_device_id);
-        count_++;
-        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[best_device_id]);
+        LOG_SERVER_DEBUG_ << LogOut("[%s][%d] FaissIVFSQ8Pass: nq >= gpu_search_threshold, specify gpu %d to search!",
+                                    "search", 0, search_gpus_[idx_]);
+        res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, search_gpus_[idx_]);
+        idx_ = (idx_ + 1) % search_gpus_.size();
     }
     auto label = std::make_shared<SpecResLabel>(res_ptr);
     task->label() = label;
diff --git a/core/src/scheduler/selector/FaissIVFSQ8Pass.h b/core/src/scheduler/selector/FaissIVFSQ8Pass.h
index b3207763f7..99530c7635 100644
--- a/core/src/scheduler/selector/FaissIVFSQ8Pass.h
+++ b/core/src/scheduler/selector/FaissIVFSQ8Pass.h
@@ -41,7 +41,7 @@ class FaissIVFSQ8Pass : public Pass, public server::GpuResourceConfigHandler {
     Run(const TaskPtr& task) override;
 
  private:
-    int64_t count_ = 0;
+    int64_t idx_ = 0;
 };
 
 using FaissIVFSQ8PassPtr = std::shared_ptr<FaissIVFSQ8Pass>;