Ax1an commented on a change in pull request #7243:
URL: https://github.com/apache/skywalking/pull/7243#discussion_r663875013
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File path:
apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/jvm/thread/ThreadProvider.java
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@@ -31,12 +32,58 @@
}
public Thread getThreadMetrics() {
+ int newStateThreadCount = 0;
+ int runnableStateThreadCount = 0;
+ int blockedStateThreadCount = 0;
+ int waitingStateThreadCount = 0;
+ int timedWaitingStateThreadCount = 0;
+ int terminatedStateThreadCount = 0;
+
+ ThreadInfo[] threadInfos =
threadMXBean.getThreadInfo(threadMXBean.getAllThreadIds(), 0);
+ if (threadInfos != null) {
+ for (ThreadInfo threadInfo : threadInfos) {
+ if (threadInfo != null) {
+ switch (threadInfo.getThreadState()) {
+ case NEW:
+ newStateThreadCount++;
+ break;
+ case RUNNABLE:
+ runnableStateThreadCount++;
+ break;
+ case BLOCKED:
+ blockedStateThreadCount++;
+ break;
+ case WAITING:
+ waitingStateThreadCount++;
+ break;
+ case TIMED_WAITING:
+ timedWaitingStateThreadCount++;
+ break;
+ case TERMINATED:
+ terminatedStateThreadCount++;
+ break;
+ default:
+ break;
+ }
+ } else {
+ terminatedStateThreadCount++;
+ }
Review comment:
The code as a whole looks good. However, there may be some inaccuracies
in this place. I found that `getAllThreadIds()` and `getThreadInfo()` method
both return information about the active thread. However, when the thread is in
the NEW and TERMINATED state, the `isAlive()` method will return false, that
is, they are inactive. Therefore, in this way, we cannot correctly count the
number of threads in the NEW and TERMINATED state.
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