[GitHub] [pulsar] thetumbled commented on a diff in pull request #17820: [Bugfix] [LinuxInfoUtils] incorrect CPU usage collected by pulsar #17815

[GitBox <gi...@apache.org>]

thetumbled commented on code in PR #17820:
URL: https://github.com/apache/pulsar/pull/17820#discussion_r985081349


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/LinuxInfoUtils.java:
##########
@@ -72,6 +73,31 @@ public static boolean isCGroupEnabled() {
         }
     }
 
+    /**
+     *  Get total cpu count.
+     * @return Total cpu count
+     */
+    public static int getTotalCpuCount() {
+        int totalCpuCount=0;
+        try {
+            String[] ranges = readTrimStringFromFile(Paths.get(CGROUPS_CPU_CPUSET_CPUS)).split(",");
+            for (String range : ranges) {
+                if (!range.contains("-")) {
+                    totalCpuCount++;
+                } else {
+                    int dashIndex = range.indexOf('-');
+                    int left = Integer.valueOf(range.substring(0, dashIndex));
+                    int right = Integer.valueOf(range.substring(dashIndex + 1));
+                    totalCpuCount += right - left + 1;
+                }
+            }
+        } catch (IOException e) {
+            log.warn("[LinuxInfo] Failed to read CPU counts from cgroups", e);
+            // Fallback to availableProcessors

Review Comment:
   you are right.



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