聊聊jvm的direct buffer统计

最新推荐文章于 2025-10-31 14:02:40 发布

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最新推荐文章于 2025-10-31 14:02:40 发布 · 1.8k 阅读

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#jvm

序

本文主要研究一下jvm的direct buffer统计

spring boot metrics

jvm.memory.used

{
    "name": "jvm.memory.used",
    "description": "The amount of used memory",
    "baseUnit": "bytes",
    "measurements": [
        {
            "statistic": "VALUE",
            "value": 137868592
        }
    ],
    "availableTags": [
        {
            "tag": "area",
            "values": [
                "heap",
                "nonheap"
            ]
        },
        {
            "tag": "id",
            "values": [
                "Compressed Class Space",
                "PS Survivor Space",
                "PS Old Gen",
                "Metaspace",
                "PS Eden Space",
                "Code Cache"
            ]
        }
    ]
}

jvm.memory.used包括heap和nonheap两大类

heap

http://localhost:8080/actuator/metrics/jvm.memory.used?tag=area:heap

{
    "name": "jvm.memory.used",
    "description": "The amount of used memory",
    "baseUnit": "bytes",
    "measurements": [
        {
            "statistic": "VALUE",
            "value": 84724536
        }
    ],
    "availableTags": [
        {
            "tag": "id",
            "values": [
                "PS Eden Space",
                "PS Survivor Space",
                "PS Old Gen"
            ]
        }
    ]
}

heap的话根据具体的垃圾收集器类型有不同的区分

nonheap

http://localhost:8080/actuator/metrics/jvm.memory.used?tag=area:nonheap

{
    "name": "jvm.memory.used",
    "description": "The amount of used memory",
    "baseUnit": "bytes",
    "measurements": [
        {
            "statistic": "VALUE",
            "value": 54874872
        }
    ],
    "availableTags": [
        {
            "tag": "id",
            "values": [
                "Metaspace",
                "Compressed Class Space",
                "Code Cache"
            ]
        }
    ]
}