src/main/java/com/kamco/cd/training/common/service/GpuDmonReader.java

@@ -98,7 +98,7 @@ public class GpuDmonReader {
       while ((line = br.readLine()) != null) {
 
         // 디버깅 로그
-        log.info("RAW: [{}]", line);
+        // log.info("RAW: [{}]", line);
 
         // 헤더 제거
         if (line.startsWith("#")) continue;
@@ -121,8 +121,6 @@ public class GpuDmonReader {
         }
 
         gpuUtilMap.put(index, util);
-        // GPU 값 들어오는지 확인 디버깅
-        log.info("GPU UPDATE → index={}, util={}", index, util);
       }
     }
 

src/main/java/com/kamco/cd/training/common/service/SystemMonitorService.java

@@ -91,53 +91,44 @@ public class SystemMonitorService {
   // =========================
   private double readCpu() throws Exception {
 
-    // linux 환경일때만 실행
-    if (!isLinux()) {
-      return 0; // 또는 -1
-    }
+    if (!isLinux()) return 0;
 
-    BufferedReader br = new BufferedReader(new FileReader("/proc/stat"));
-    String line = br.readLine(); // "cpu ..." 라인
-    br.close();
+    try (BufferedReader br = new BufferedReader(new FileReader("/proc/stat"))) {
 
-    String[] p = line.split("\\s+");
+      String line = br.readLine();
+      String[] p = line.split("\\s+");
 
-    long user = Long.parseLong(p[1]);
-    long nice = Long.parseLong(p[2]);
-    long system = Long.parseLong(p[3]);
-    long idle = Long.parseLong(p[4]);
-    long iowait = Long.parseLong(p[5]);
-    long irq = Long.parseLong(p[6]);
-    long softirq = Long.parseLong(p[7]);
+      long user = Long.parseLong(p[1]);
+      long nice = Long.parseLong(p[2]);
+      long system = Long.parseLong(p[3]);
+      long idle = Long.parseLong(p[4]);
+      long iowait = Long.parseLong(p[5]);
+      long irq = Long.parseLong(p[6]);
+      long softirq = Long.parseLong(p[7]);
 
-    // 전체 시간 (누적)
-    long total = user + nice + system + idle + iowait + irq + softirq;
+      long total = user + nice + system + idle + iowait + irq + softirq;
+      long idleAll = idle + iowait;
 
-    // idle 시간
-    long idleAll = idle + iowait;
+      if (prevTotal == 0) {
+        prevTotal = total;
+        prevIdle = idleAll;
+        return 0;
+      }
+
+      long totalDiff = total - prevTotal;
+      long idleDiff = idleAll - prevIdle;
 
-    // 최초 호출 (이전값 없음)
-    if (prevTotal == 0) {
       prevTotal = total;
       prevIdle = idleAll;
+
+      if (totalDiff == 0) return 0;
+
+      return (1.0 - (double) idleDiff / totalDiff) * 100;
+
+    } catch (Exception e) {
+      log.warn("CPU read fail", e);
       return 0;
     }
-
-    // 이전 대비 변화량
-    long totalDiff = total - prevTotal;
-    long idleDiff = idleAll - prevIdle;
-
-    log.info("CPU raw total={}, idle={}", total, idleAll);
-
-    // 상태 업데이트
-    prevTotal = total;
-    prevIdle = idleAll;
-
-    log.info("CPU prev total={}, prev idle={}", prevTotal, prevIdle);
-    log.info("CPU diff totalDiff={}, idleDiff={}", totalDiff, idleDiff);
-
-    // CPU 사용률 계산
-    return (1.0 - (double) idleDiff / totalDiff) * 100;
   }
 
   private boolean isLinux() {
@@ -200,13 +191,12 @@ public class SystemMonitorService {
     // =====================
     // GPU 평균 (30초)
     // =====================
-    for (Map.Entry<Integer, Integer> entry : gpuMap.entrySet()) {
+    for (Map.Entry<Integer, Deque<Integer>> entry : gpuHistory.entrySet()) {
 
       int index = entry.getKey();
+      Deque<Integer> q = entry.getValue();
 
-      Deque<Integer> q = gpuHistory.get(index);
-
-      int avg = (int) (q == null ? 0 : q.stream().mapToInt(i -> i).average().orElse(0));
+      int avg = (int) q.stream().mapToInt(i -> i).average().orElse(0);
 
       dto.gpus.add(new MonitorDto.Gpu(index, avg));
     }