However, when threads are blocked, they will put the CPU in a wait state. When a CPU is in an idle state, it reports its status as being unused, as it's not doing any work.
Concurrency problems and deadlocks aren't really a processor issue, but instead a problem with how threads are allocated, and the methods they access are synchronized or blocked.ĬPU utilization can also be a misleading metric.
Java CPU metrics can be misleadingīlocked threads with contention issues can also cause JVM profiler tools to report 100% Java CPU utilization. The fix is to address the underlying object allocation issue that inefficiently uses memory and triggers needless GC. Rectification of the GC issue has nothing to do with implementing more efficient algorithms or logical workflows. Increasingly frequent GC cycles will not only trigger JVM stop-the-world events that make an application seem unresponsive, but they also cause high Java CPU utilization spikes. For example, if an application overzealously allocates instances, the garbage collector (GC) will be forced into action when object references go out of scope.
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