diff --git a/cpp/src/db/DBImpl.cpp b/cpp/src/db/DBImpl.cpp
index 7145db04b2..a9386ff1eb 100644
--- a/cpp/src/db/DBImpl.cpp
+++ b/cpp/src/db/DBImpl.cpp
@@ -317,6 +317,7 @@ void DBImpl::StartMetricTask() {
     int64_t cache_usage = cache::CpuCacheMgr::GetInstance()->CacheUsage();
     int64_t cache_total = cache::CpuCacheMgr::GetInstance()->CacheCapacity();
     server::Metrics::GetInstance().CpuCacheUsageGaugeSet(cache_usage*100/cache_total);
+    server::Metrics::GetInstance().GpuCacheUsageGaugeSet();
     uint64_t size;
     Size(size);
     server::Metrics::GetInstance().DataFileSizeGaugeSet(size);
diff --git a/cpp/src/db/meta/SqliteMetaImpl.cpp b/cpp/src/db/meta/SqliteMetaImpl.cpp
index d0d6423688..99487c1b70 100644
--- a/cpp/src/db/meta/SqliteMetaImpl.cpp
+++ b/cpp/src/db/meta/SqliteMetaImpl.cpp
@@ -421,7 +421,7 @@ Status SqliteMetaImpl::DescribeTableIndex(const std::string &table_id, TableInde
         if (groups.size() == 1) {
             index.engine_type_ = std::get<0>(groups[0]);
             index.nlist_ = std::get<1>(groups[0]);
-            index.metric_type_ = std::get<2>(groups[0]);
+            index.metric_type_ = std::get<3>(groups[0]);
         } else {
             return Status::NotFound("Table " + table_id + " not found");
         }
diff --git a/cpp/src/metrics/MetricBase.h b/cpp/src/metrics/MetricBase.h
index a11bf14179..3fb947cb10 100644
--- a/cpp/src/metrics/MetricBase.h
+++ b/cpp/src/metrics/MetricBase.h
@@ -32,7 +32,7 @@ class MetricsBase{
     virtual void BuildIndexDurationSecondsHistogramObserve(double value) {};
 
     virtual void CpuCacheUsageGaugeSet(double value) {};
-    virtual void GpuCacheUsageGaugeSet(double value) {};
+    virtual void GpuCacheUsageGaugeSet() {};
 
     virtual void MetaAccessTotalIncrement(double value = 1) {};
     virtual void MetaAccessDurationSecondsHistogramObserve(double value) {};
diff --git a/cpp/src/metrics/PrometheusMetrics.cpp b/cpp/src/metrics/PrometheusMetrics.cpp
index 08dad64724..08f1fe7dc2 100644
--- a/cpp/src/metrics/PrometheusMetrics.cpp
+++ b/cpp/src/metrics/PrometheusMetrics.cpp
@@ -167,15 +167,26 @@ void PrometheusMetrics::CPUTemperature() {
     }
 }
 
-void PrometheusMetrics::GpuCacheUsageGaugeSet(double value) {
+void PrometheusMetrics::GpuCacheUsageGaugeSet() {
     if(!startup_) return;
-    int64_t num_processors = server::SystemInfo::GetInstance().num_processor();
+    server::ConfigNode& config = server::ServerConfig::GetInstance().GetConfig(server::CONFIG_CACHE);
+    std::string gpu_ids_str = config.GetValue(server::CONFIG_GPU_IDS, "0,1");
 
-    for (auto i = 0; i < num_processors; ++i) {
-//        int gpu_cache_usage = cache::GpuCacheMgr::GetInstance(i)->CacheUsage();
-//        int gpu_cache_total = cache::GpuCacheMgr::GetInstance(i)->CacheCapacity();
-//        prometheus::Gauge &gpu_cache = gpu_cache_usage_.Add({{"GPU_Cache", std::to_string(i)}});
-//        gpu_cache.Set(gpu_cache_usage * 100 / gpu_cache_total);
+    std::vector<uint64_t > gpu_ids;
+
+    std::stringstream ss(gpu_ids_str);
+    for (int i; ss >> i;) {
+        gpu_ids.push_back(i);
+        if (ss.peek() == ',') {
+            ss.ignore();
+        }
+    }
+
+    for(auto i = 0; i < gpu_ids.size(); ++i) {
+        uint64_t cache_usage = cache::GpuCacheMgr::GetInstance(gpu_ids[i])->CacheUsage();
+        uint64_t cache_capacity = cache::GpuCacheMgr::GetInstance(gpu_ids[i])->CacheCapacity();
+        prometheus::Gauge &gpu_cache = gpu_cache_usage_.Add({{"GPU_Cache", std::to_string(i)}});
+        gpu_cache.Set(cache_usage * 100 / cache_capacity);
     }
 }
 
diff --git a/cpp/src/metrics/PrometheusMetrics.h b/cpp/src/metrics/PrometheusMetrics.h
index ab37195583..f0fe74cfaa 100644
--- a/cpp/src/metrics/PrometheusMetrics.h
+++ b/cpp/src/metrics/PrometheusMetrics.h
@@ -55,7 +55,7 @@ class PrometheusMetrics: public MetricsBase {
     void IndexFileSizeHistogramObserve(double value) override { if(startup_) index_files_size_histogram_.Observe(value);};
     void BuildIndexDurationSecondsHistogramObserve(double value) override { if(startup_) build_index_duration_seconds_histogram_.Observe(value);};
     void CpuCacheUsageGaugeSet(double value) override { if(startup_) cpu_cache_usage_gauge_.Set(value);};
-    void GpuCacheUsageGaugeSet(double value) override; 
+    void GpuCacheUsageGaugeSet() override;
 
     void MetaAccessTotalIncrement(double value = 1) override { if(startup_) meta_access_total_.Increment(value);};
     void MetaAccessDurationSecondsHistogramObserve(double value) override { if(startup_) meta_access_duration_seconds_histogram_.Observe(value);};
@@ -343,7 +343,7 @@ class PrometheusMetrics: public MetricsBase {
         .Help("current cache usage by bytes")
         .Register(*registry_);
     prometheus::Gauge &cpu_cache_usage_gauge_ = cpu_cache_usage_.Add({});
-    
+
     //record GPU cache usage and %
     prometheus::Family<prometheus::Gauge> &gpu_cache_usage_ = prometheus::BuildGauge()
             .Name("gpu_cache_usage_bytes")
diff --git a/cpp/unittest/metrics/metricbase_test.cpp b/cpp/unittest/metrics/metricbase_test.cpp
index feda6d1bf9..10087b370a 100644
--- a/cpp/unittest/metrics/metricbase_test.cpp
+++ b/cpp/unittest/metrics/metricbase_test.cpp
@@ -22,7 +22,7 @@ TEST(MetricbaseTest, METRICBASE_TEST){
     instance.IndexFileSizeHistogramObserve(1.0);
     instance.BuildIndexDurationSecondsHistogramObserve(1.0);
     instance.CpuCacheUsageGaugeSet(1.0);
-    instance.GpuCacheUsageGaugeSet(1.0);
+    instance.GpuCacheUsageGaugeSet();
     instance.MetaAccessTotalIncrement();
     instance.MetaAccessDurationSecondsHistogramObserve(1.0);
     instance.FaissDiskLoadDurationSecondsHistogramObserve(1.0);
diff --git a/cpp/unittest/metrics/prometheus_test.cpp b/cpp/unittest/metrics/prometheus_test.cpp
index ece3cf9012..912e910f32 100644
--- a/cpp/unittest/metrics/prometheus_test.cpp
+++ b/cpp/unittest/metrics/prometheus_test.cpp
@@ -23,7 +23,7 @@ TEST(PrometheusTest, PROMETHEUS_TEST){
     instance.IndexFileSizeHistogramObserve(1.0);
     instance.BuildIndexDurationSecondsHistogramObserve(1.0);
     instance.CpuCacheUsageGaugeSet(1.0);
-    instance.GpuCacheUsageGaugeSet(1.0);
+    instance.GpuCacheUsageGaugeSet();
     instance.MetaAccessTotalIncrement();
     instance.MetaAccessDurationSecondsHistogramObserve(1.0);
     instance.FaissDiskLoadDurationSecondsHistogramObserve(1.0);