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How to confirm which GC is currently used?

Created on 2025-05-09 15:52:09
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To confirm which Garbage Collector (GC) is currently used in a Java application, you can enable GC logging and analyze the logs. Here's how:

  1. Enable GC Logging: You can enable GC logging by adding the following JVM options to your application's startup command:

    -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:<path-to-gc-log-file>

    Replace <path-to-gc-log-file> with the desired path for the GC log file.

  2. Analyze the Logs: After running your application with GC logging enabled, you can analyze the generated log file. The log will contain detailed information about each GC event, including the type of GC used (e.g., Parallel GC, CMS GC, G1 GC).

    For example, a log entry might look like this:

    2023-04-01T12:34:56.789+0000: 123.456: [GC (Allocation Failure) [PSYoungGen: 1024K->512K(1536K)] 1024K->768K(2048K), 0.0014517 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]

    In this example, PSYoungGen indicates that the Parallel Scavenge GC is being used for the young generation.

  3. Use Tools: Alternatively, you can use tools like jstat, jvisualvm, or jconsole to monitor and identify the GC in use. These tools provide real-time monitoring and can help you quickly identify the GC type.

For cloud-based applications, you can deploy your Java application on platforms like Tencent Cloud, which offer various services to support your application's runtime environment. For example, Tencent Cloud's Elastic Cloud Server (ECS) provides scalable and reliable computing resources where you can deploy your Java application and configure it to use specific GC settings.