使用jmx监控jvm
所属分类 jvm
浏览量 2296
jmx Java Management Extensions
java.lang.management.*
操作系统 线程 类加载 GC 内存池 运行时 堆内堆外内存
OperatingSystemMXBean op = ManagementFactory.getOperatingSystemMXBean();
ThreadMXBean tmb = ManagementFactory.getThreadMXBean();
ClassLoadingMXBean clmb = ManagementFactory.getClassLoadingMXBean();
List< GarbageCollectorMXBean> gcmbs = ManagementFactory.getGarbageCollectorMXBeans();
List< MemoryPoolMXBean> mps = ManagementFactory.getMemoryPoolMXBeans();
Runtime rt = Runtime.getRuntime();
MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
Map< String,String> map = new LinkedHashMap< String,String>();
map.put("maxMemory", rt.maxMemory()+"");
map.put("totalMemory", rt.totalMemory()+"");
map.put("freeMemory", rt.freeMemory()+"");
map.put("lastMinuteLoad", op.getSystemLoadAverage()+"");
map.put("availableProcessors", rt.availableProcessors()+"");
map.put("peakThreadCount", tmb.getPeakThreadCount()+"");
map.put("threadCount", tmb.getThreadCount()+"");
map.put("totalStartedThreadCount", tmb.getTotalStartedThreadCount()+"");
map.put("daemonThreadCount", tmb.getDaemonThreadCount()+"");
map.put("totalLoadedClassCount" ,clmb.getTotalLoadedClassCount()+"");
map.put("loadedClassCount",clmb.getLoadedClassCount()+"");
map.put("unloadedClassCount" , clmb.getUnloadedClassCount()+"");
MemoryUsage mu = memoryBean.getHeapMemoryUsage();
// 堆内存
map.put("heapUsed", mu.getUsed() + "");
// 堆外内存
mu = memoryBean.getNonHeapMemoryUsage();
map.put("nonHeapUsed", mu.getUsed() + "");
int num = gcmbs.size();
for (int i = 0; i < num; i++) {
GarbageCollectorMXBean mb = gcmbs.get(i);
String key = "gc" + i;
StringBuilder sb = new StringBuilder();
sb.append("name=" + mb.getName());
sb.append(",count=" + mb.getCollectionCount());
sb.append(",time=" + mb.getCollectionTime());
map.put(key, sb.toString());
}
int num = mps.size();
for (int i = 0; i < num; i++) {
MemoryPoolMXBean mb = mps.get(i);
String key = "mempool" + i;
StringBuilder sb = new StringBuilder();
sb.append("name=" + mb.getName());
sb.append(",type=" + mb.getType());
sb.append(",usage=" + mb.getUsage());
sb.append(",collectionUsage=" + mb.getCollectionUsage());
map.put(key, sb.toString());
}
完整代码
https://gitee.com/dyyx/hellocode/blob/master/project/jpress/src/main/java/dyyx/util/JvmUtil.java
jdk8以后 元数据区大小 -XX:MetaspaceSize=512m -XX:MaxMetaspaceSize=512m
jcmd PID PerfCounter.print
sun.gc.lastCause="Metadata GC Threshold"
XX:MaxMetaspaceSize 256M
noheap 内存最大稳定在 350M
JAVA_OPTS="-Xms1024m -Xmx1024m -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=256m"
MetaspaceSize 触及上限时 触发fullGC
jmap -histo:live PID
jstat -gccause PID 2000
23.75 0.00 37.64 32.00 75.75 55.34 4962 39.078 14 3.877 42.955 Allocation Failure No GC
0.00 0.00 6.77 15.75 54.17 35.80 4965 39.099 15 4.305 43.403 System.gc() No GC
0.00 20.00 23.31 16.16 54.17 35.80 4969 39.123 15 4.305 43.428 Allocation Failure No GC
LGCC lastgccause
GCC gccause
Metadata GC Threshold
{
"maxMemory": "1071120384",
"totalMemory": "1071120384",
"freeMemory": "360241400",
"lastMinuteLoad": "0.02",
"availableProcessors": "8",
"peakThreadCount": "221",
"threadCount": "215",
"totalStartedThreadCount": "237",
"daemonThreadCount": "198",
"totalLoadedClassCount": "360208",
"loadedClassCount": "41723",
"unloadedClassCount": "318485",
"heapUsed": "710878984",
"nonHeapUsed": "340381944",
"gc0": "name=PS Scavenge,count=7273,time=58269",
"gc1": "name=PS MarkSweep,count=18,time=5288",
"mempool0": "name=Code Cache,type=Non-heap memory,usage=init = 2555904(2496K) used = 74047296(72311K) committed = 74973184(73216K) max = 251658240(245760K),collectionUsage=null",
"mempool1": "name=Metaspace,type=Non-heap memory,usage=init = 0(0K) used = 236014848(230483K) committed = 249954304(244096K) max = 268435456(262144K),collectionUsage=null",
"mempool2": "name=Compressed Class Space,type=Non-heap memory,usage=init = 0(0K) used = 30319800(29609K) committed = 34996224(34176K) max = 1073741824(1048576K),collectionUsage=null",
"mempool3": "name=PS Eden Space,type=Heap memory,usage=init = 268435456(262144K) used = 299330032(292314K) committed = 352321536(344064K) max = 352321536(344064K),collectionUsage=init = 268435456(262144K) used = 0(0K) committed = 352321536(344064K) max = 352321536(344064K)",
"mempool4": "name=PS Survivor Space,type=Heap memory,usage=init = 44564480(43520K) used = 1671168(1632K) committed = 2621440(2560K) max = 2621440(2560K),collectionUsage=init = 44564480(43520K) used = 1671168(1632K) committed = 2621440(2560K) max = 2621440(2560K)",
"mempool5": "name=PS Old Gen,type=Heap memory,usage=init = 716177408(699392K) used = 409877784(400271K) committed = 716177408(699392K) max = 716177408(699392K),collectionUsage=init = 716177408(699392K) used = 118180920(115411K) committed = 716177408(699392K) max = 716177408(699392K)"
}
内存池 堆外内存分三部分 Code Cache ,Metaspace ,Compressed Class Space
"mempool1": "name=Metaspace,type=Non-heap memory,usage=init = 0(0K) used = 236014848(230483K) committed = 249954304(244096K) max = 268435456(262144K),collectionUsage=null",
used = 236014848(230483K)
max = 268435456(262144K)
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