Java JMX MemoryPoolMXBean

功能

MemoryPoolMXBean可以获取Java服务的内存管理器信息：

• CodeCacheManager: 代码缓存管理器
• Metaspace Manager: 元数据管理器
• G1 Young Generation: G1年轻代
• G1 Old Generation: G1老年代

代码

public class MemoryPoolMXBeansTest {

    public static void main(String[] args) {
        List<MemoryPoolMXBean> memoryPoolMXBeans = ManagementFactory.getMemoryPoolMXBeans();
        for (MemoryPoolMXBean memoryPoolMXBean : memoryPoolMXBeans) {
            System.out.println("ObjectName: " + memoryPoolMXBean.getObjectName());
            System.out.println("Name: " + memoryPoolMXBean.getName());
            System.out.println("IsValid: " + memoryPoolMXBean.isValid());
            System.out.println("MemoryManagerNames: " + Arrays.toString(memoryPoolMXBean.getMemoryManagerNames()));
            System.out.println("MemoryType: " + memoryPoolMXBean.getType().name());
            System.out.println("MemoryUsage: " + memoryPoolMXBean.getUsage().toString());
            System.out.println("PeakUsage: " + memoryPoolMXBean.getPeakUsage());
            if (memoryPoolMXBean.isUsageThresholdSupported()) {
                System.out.println("UsageThreshold: " + memoryPoolMXBean.getUsageThreshold());
                System.out.println("UsageThresholdCount: " + memoryPoolMXBean.getUsageThresholdCount());
                System.out.println("IsUsageThresholdSupported: " + memoryPoolMXBean.isUsageThresholdSupported());
            } else {
                System.out.println("Usage Threshold Not Support");
            }
            if (memoryPoolMXBean.isCollectionUsageThresholdSupported()) {
                System.out.println("CollectionUsage: " + memoryPoolMXBean.getCollectionUsage().toString());
                System.out.println("CollectionUsageThreshold: " + memoryPoolMXBean.getCollectionUsageThreshold());
                System.out.println("CollectionUsageThresholdCount: " + memoryPoolMXBean.getCollectionUsageThresholdCount());
                System.out.println("IsCollectionUsageThresholdExceeded: " + memoryPoolMXBean.isCollectionUsageThresholdExceeded());

            } else {
                System.out.println("Collection Usage Not Support");
            }
            memoryPoolMXBean.resetPeakUsage();
            System.out.println("---------------------------------");
        }
    }

}

输出

ObjectName: java.lang:type=MemoryPool,name=CodeHeap 'non-nmethods'
Name: CodeHeap 'non-nmethods'
IsValid: true
MemoryManagerNames: [CodeCacheManager]
MemoryType: NON_HEAP
MemoryUsage: init = 2555904(2496K) used = 1097984(1072K) committed = 2555904(2496K) max = 5849088(5712K)
PeakUsage: init = 2555904(2496K) used = 1138176(1111K) committed = 2555904(2496K) max = 5849088(5712K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
Collection Usage Not Support
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=Metaspace
Name: Metaspace
IsValid: true
MemoryManagerNames: [Metaspace Manager]
MemoryType: NON_HEAP
MemoryUsage: init = 0(0K) used = 7631824(7452K) committed = 8257536(8064K) max = -1(-1K)
PeakUsage: init = 0(0K) used = 7631824(7452K) committed = 8257536(8064K) max = -1(-1K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
Collection Usage Not Support
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=CodeHeap 'profiled nmethods'
Name: CodeHeap 'profiled nmethods'
IsValid: true
MemoryManagerNames: [CodeCacheManager]
MemoryType: NON_HEAP
MemoryUsage: init = 2555904(2496K) used = 854016(834K) committed = 2555904(2496K) max = 122896384(120016K)
PeakUsage: init = 2555904(2496K) used = 855808(835K) committed = 2555904(2496K) max = 122896384(120016K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
Collection Usage Not Support
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=Compressed Class Space
Name: Compressed Class Space
IsValid: true
MemoryManagerNames: [Metaspace Manager]
MemoryType: NON_HEAP
MemoryUsage: init = 0(0K) used = 733672(716K) committed = 917504(896K) max = 1073741824(1048576K)
PeakUsage: init = 0(0K) used = 733672(716K) committed = 917504(896K) max = 1073741824(1048576K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
Collection Usage Not Support
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=G1 Eden Space
Name: G1 Eden Space
IsValid: true
MemoryManagerNames: [G1 Old Generation, G1 Young Generation]
MemoryType: HEAP
MemoryUsage: init = 27262976(26624K) used = 4194304(4096K) committed = 27262976(26624K) max = -1(-1K)
PeakUsage: init = 27262976(26624K) used = 4194304(4096K) committed = 27262976(26624K) max = -1(-1K)
Usage Threshold Not Support
CollectionUsage: init = 27262976(26624K) used = 0(0K) committed = 0(0K) max = -1(-1K)
CollectionUsageThreshold: 0
CollectionUsageThresholdCount: 0
IsCollectionUsageThresholdExceeded: false
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=G1 Old Gen
Name: G1 Old Gen
IsValid: true
MemoryManagerNames: [G1 Old Generation, G1 Young Generation]
MemoryType: HEAP
MemoryUsage: init = 509607936(497664K) used = 0(0K) committed = 509607936(497664K) max = 8589934592(8388608K)
PeakUsage: init = 509607936(497664K) used = 0(0K) committed = 509607936(497664K) max = 8589934592(8388608K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
CollectionUsage: init = 509607936(497664K) used = 0(0K) committed = 0(0K) max = 8589934592(8388608K)
CollectionUsageThreshold: 0
CollectionUsageThresholdCount: 0
IsCollectionUsageThresholdExceeded: false
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=G1 Survivor Space
Name: G1 Survivor Space
IsValid: true
MemoryManagerNames: [G1 Old Generation, G1 Young Generation]
MemoryType: HEAP
MemoryUsage: init = 0(0K) used = 0(0K) committed = 0(0K) max = -1(-1K)
PeakUsage: init = 0(0K) used = 0(0K) committed = 0(0K) max = -1(-1K)
Usage Threshold Not Support
CollectionUsage: init = 0(0K) used = 0(0K) committed = 0(0K) max = -1(-1K)
CollectionUsageThreshold: 0
CollectionUsageThresholdCount: 0
IsCollectionUsageThresholdExceeded: false
---------------------------------
ObjectName: java.lang:type=MemoryPool,name=CodeHeap 'non-profiled nmethods'
Name: CodeHeap 'non-profiled nmethods'
IsValid: true
MemoryManagerNames: [CodeCacheManager]
MemoryType: NON_HEAP
MemoryUsage: init = 2555904(2496K) used = 174976(170K) committed = 2555904(2496K) max = 122912768(120032K)
PeakUsage: init = 2555904(2496K) used = 174976(170K) committed = 2555904(2496K) max = 122912768(120032K)
UsageThreshold: 0
UsageThresholdCount: 0
IsUsageThresholdSupported: true
Collection Usage Not Support
---------------------------------