All classes including platform// Show all members of the rootset Show instance counts for all classes (including platform) Show instance counts for all classes (excluding platform) Show heap histogram Show finalizer summary Execute Object Query Language (OQL) query 一般查看堆异常情况主要看这个两个部...
但很多应用都没有这样明显的特性,在抉择时应该根据以下两点:(A)本着Full GC尽量少的原则,让年老代尽量缓存常用对象,JVM的默认比例1:2也是这个道理 (B)通过观察应用一段时间,看其他在峰值时年老代会占多少内存,在不影响Full GC的前提下,根据实际情况加大年轻代,比如可以把比例控制在1:1。但应该给年老代至少预...
= truebool ShowMessageBoxOnError = falsebool ShrinkHeapInSteps = truesize_t SoftMaxHeapSize = 4282384384intx SoftRefLRUPolicyMSPerMB = 1000bool SplitIfBlocks = trueintx StackRedPages = 1intx StackReservedPages = 0intx StackShadowPages = 7bool StackTraceInThrowable = trueintx StackYellowPages...
这两个span的拥有同一个Trace Id: 1.并且在信息收集过程中, 会记录调用的开始时间, 结束时间, 从中计算出调用的耗时.这样, 就可以清楚的知道, 每次调用:经过了哪几个服务以及服务的调用顺序 每个服务过程的耗时 1.2. 什么是CATCAT是由大众点评开源的一款调用链监控系统, 基于Java开发的. 有很多互联网企业在...
在eclipse根目录下创建文件options,文件内容为:org.eclipse.ui/perf/showHeapStatus=true 修改eclipse根目录下的eclipse.ini文件,在开头处添加如下内容: -debug options -vm javaw.exe 重新启动eclipse,就可以看到下方状态条多了JVM信息。 b. 打开eclipse-窗口-首选项-Java-已安装的JRE(对在当前开发环境中运行的java...
-version -showversion -cp -classpath X 参数(非标准化参数) -Xint:解释执行 -Xcomp:第一次使用就编译成本地代码 -Xmixed:混合模式,JVM 自己决定是否编译成本地代码 示例: java -version(默认是混合模式) Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode) ...
6361589 hotspot runtime_system Print out stack trace for target thread of GC crash 6918065 java classes_2d Crash in Java2D blit loop (IntArgbToIntArgbPreSrcOverMaskBlit) in 64bit mode 6336384 java classes_awt ScrollBar does not show up correctly in 6.0 6416177 java classes_fontprop SuSE 10...
Look for nested exceptions:Sometimes, an exception can be caused by another exception. In these cases, the stack trace will show a nested exception. Look for any nested exceptions to understand the full context of the error. Use an IDE or debugger:If you're having trouble analyzing the stack...
they will be uselessly empty. At each garbage collection the virtual machine chooses a threshold number of times an object can be copied before it is tenured. This threshold is chosen to keep the survivors half full. An option, -XX:+PrintTenuringDistribution, can be used to show this thresh...
应用僵死:jstack 耗时高:trace跟踪、Benchmark Cpu利用率高:Cpu profile分析 GC频繁、耗时高:GC log分析 OOM、内存占用高、泄漏:dump内存分析 案例分享 Cobar僵死,进程端口在,但不能处理请求 先踢掉故障机器,保留现场再排查问题,根据日志,定位为内存泄漏小