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CPU and memory live charts

Last modified: 11 October 2024

IntelliJ IDEA provides a way to monitor live performance statistics for a running process through CPU and Memory Live Charts.

As opposed to viewing static figures, live data may help you to visualize resource consumption, identify resource-related bottlenecks, and understand how certain events affect the program performance.

For example, in the picture below, we can see what a memory leak looks like in the Heap Memory chart. Sometimes it is enough to figure out the cause, and when it is not enough, it can give a clue for further investigation.

Memory leak on CPU and Memory Live Charts

CPU and Memory Live Charts are automatically shown for all programs that you run from IntelliJ IDEA:

CPU and Memory Live Charts in the Run tool window

The following metrics are available:

  • CPU – CPU load for the given process. Each process has its own figure.

  • Heap memory – the current usage of heap memory and maximum heap size. The heap size increases when new objects of reference types are allocated and decreases when they are garbage-collected.

  • Threads – the overall number of threads (yellow) and daemon threads (red). The number after the slash is the peak number of threads since the process has started.

  • Non-heap memory – this type of memory is used by the JVM to store class metadata, method data, and other JVM internals. The first value is the current memory value, and the second is the maximum value since the charts have started.