Java笔记：Greys-Java线上异常排查
1.软件安装与启动
Greys支持在线安装和本地安装两种安装方案，安装即可用，推荐使用在线安装。
1.1 在线安装（推荐）
请复制以下内容，并粘贴到命令行中。
curl -sLk http://ompc.oss.aliyuncs.com/greys/install.sh|bash
命令将会下载启动脚本文件greys.sh到当前目录，你可以放在任何地方或加入到$PATH中
1.2 本地安装
在某些情况下，目标服务器无法访问远程阿里云主机，此时你需要自行下载greys的安装文件。
1）下载最新版本的GREYS
http://ompc.oss.aliyuncs.com/greys/release/greys-stable-bin.zip
2）解压zip文件后，执行以下命令
cd greys
sh ./install-local.sh
即完成本地安装。
常见安装问题
3）下载失败
通常这样的原因你需要检查你的网络是否畅通，核对是否能正确访问这个网址
http://ompc.oss.aliyuncs.com/greys/greys.sh
downloading...
download failed!
4）没有权限
安装脚本首先会将greys文件从阿里云服务器上下载到当前执行脚本的目录，所以你必须要拥有当前目录的写权限。
permission denied, target directory is not writable.
1.3 启动关闭Greys
# ./greys.sh [@IP:PORT]
[root@mvxl52738 ]# greys.sh 57951
_
____ ____ _____ _ _ ___ _____ _____ ____ _____ _| |_ ___ ____ _ _
/ _ |/ ___) ___ | | | |/___|_____|____ | _ \(____ (_ _) _ \| \| | | |
( (_| | | | ____| |_| |___ | / ___ | | | / ___ | | || |_| | | | | |_| |
\___ |_| |_____)\__ (___/ \_____|_| |_\_____| \__)___/|_|_|_|\__ |
(_____| (____/ (____/
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|v|e|r|s|i|o|n|:|1|.|7|.|6|.|6|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
ga?>help
# 查看帮助文档
ga?>shutdown
Greys Server is shut down.
1.4 远程连接Greys
远程连接，当然也是可以的。配置对应的ip和端口，就能远程协助了。（需要开启agent）
[root@mvxl52740 greys]# ./greys.sh @10.18.40.183:3658
_
____ ____ _____ _ _ ___ _____ _____ ____ _____ _| |_ ___ ____ _ _
/ _ |/ ___) ___ | | | |/___|_____|____ | _ \(____ (_ _) _ \| \| | | |
( (_| | | | ____| |_| |___ | / ___ | | | / ___ | | || |_| | | | | |_| |
\___ |_| |_____)\__ (___/ \_____|_| |_\_____| \__)___/|_|_|_|\__ |
(_____| (____/ (____/
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|v|e|r|s|i|o|n|:|1|.|7|.|6|.|6|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
ga?>
ga?>tt -t -n 3 *OrderReportFacadeImpl *
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:12) cost in 68 ms.
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | PROCESS-ID | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1003 | 1003 | 2018-09-15 17:40:24 | 14 | true | false | 0x68d36ec | OrderReportFacadeImpl | lambda$selectItem$3 |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1004 | 1004 | 2018-09-15 17:40:24 | 15 | true | false | 0x68d36ec | OrderReportFacadeImpl | selectItem |
2.入门知识
2.1 会话与任务（不重要）
Greys是一个C/S架构的程序，所以当Client访问到Server时，Server会维护一个session（会话），以及session的心跳、超时机制。事务（Tx）机制则是建立在session的基础上，所有的命令交互都会创建一个事务，并且产生对应的队列进行输出缓冲。
事务伴随着命令的生命周期而存在，命令分两种：
1）立即返回
立即返回的命令定义是：敲下命令后Server端立即返回最终结果，后续无持续反馈信息，释放Client对输入的锁定，重新开放让用户输入信息，比如version、sc、sm等。
2）等待中止
等待中止的命令则是需要用户主动输入Ctrl+D完成的命令中止操作。命令执行后无法立即返回最终结果，而是不断的将中间产生的输出源源不断的输出到客户端中，这种命令比如stack、monitor等。
当session关闭时，所有挂在session的事务也会立即被关闭。
2.2 表达式
Greys相对于HouseMD、BTrace而言最灵活的地方就是在用表达式来灵活的支持不同的问题排查、分析场景。
表达式分两种：条件表达式与观察表达式
1) 条件表达式
条件表达式用在使用表达式表达TRUE或FALSE的场景，从1.6.0.6版本开始，trace、stack、tt、watch命令都增加了条件表达式支持。
条件表达式将会使用greys内置的表达式解析引擎，识别OGNL语法。
特别指出的是，如果你书写了一个错误的条件表达式，greys为了兼容错误会解析为FALSE。
以下是一些条件表达式使用的例子和预测结果
可以对一些值进行判断，如返回值是否为null
2) 观察表达式
观察表达式用在使用表达式表达输出内容的场景，尤其在watch和tt命令中，观察表达式至关重要。
条件表达式将会使用greys内置的表达式解析引擎，识别OGNL语法，将表达式转换为待输出的对象。
以下是一些观察表达式使用的例子
1.字符串拼接
clazz.name+"."+method.name
2.数字运算
clazz.name.length()+method.name.length()
2.3 表达式核心变量(重要)
无论是匹配表达式也好、观察表达式也罢，他们核心判断变量都是围绕着一个greys中的通用通知对象Advice进行。
它的简略代码结构如下
public class Advice {
private final ClassLoader loader;
private final Class clazz;
private final GaMethod method;
private final Object target;
private final Object[] params;
private final Object returnObj;
private final Throwable throwExp;
private final boolean isBefore;
private final boolean isThrow;
private final boolean isReturn;
// getter/setter
}
这里列一个表格来说明不同变量的含义
所有变量都可以在表达式中直接使用，如果在表达式中编写了不符合OGNL脚本语法或者引入了不在表格中的变量，
对条件表达式、检索表达式而言，则一律当成false来处理 对观察表达式而言，则放弃当前方法调用的处理（不输出）
2.4 JDK类支持（不重要）
JDK的类默认由BootstrapClassLoader负责加载，由于Greys自己也适用了大量的JDK类，所以我不建议使用Greys直接对JDK相关类进行增强、代理。
默认而言，Greys会拒绝执行关于JDK类的操作命令。你需显式用options命令打开。
ga?>options unsafe true
+--------+--------------+-------------+
| NAME | BEFORE-VALUE | AFTER-VALUE |
+--------+--------------+-------------+
| unsafe | false | true |
+--------+--------------+-------------+
Affect(row-cnt:1) cost in 4 ms.
ga?>
2.5 模式匹配
一些命令需要对类、方法进行模式匹配过滤，从1.5.4.6及其之后的版本之后，Greys默认支持通配符匹配，目前仅支持*和?两个通配符，正则表达式需要显式指定-E参数激活。
1）模式匹配举例
原sc命令的正则表达式匹配
sc com\.apache\.commons\.lang\.StringUtils
在1.5.4.6及其之后的版本中将会默认使用通配符表达式
sc com.apache.commons.lang.StringUtils
sc *lang.StringUtils
若想继续使用正则表达式匹配，需要显式-E参数激活
sc -E com\.apache\.commons\.lang\.StringUtils
sc -E com\..*StringUtils
2）支持模式匹配的命令
所有需要模式匹配的命令都支持参数-E，他们分别是：sc、sm、stack、monitor、watch、tt、trace
3.Greys命令详解
3.1 命令清单
3.2 help命令
help命令会是你第一个在Greys中使用的命令，也会是今后使用最频繁的命令之一，当你在使用的过程中有任何不熟悉的疑问，请直接help吧～
3.2.1 查看命令清单
进入Greys的欢迎界面后，所有命令都可以通过help获取帮助。此时你直接输入一个help，Greys则会返回所有命令的大概用途介绍。
ga?>help
+----------+----------------------------------------------------------------------------------+
| sc | Search all the classes loaded by JVM |
+----------+----------------------------------------------------------------------------------+
| sm | Search the method of classes loaded by JVM |
+----------+----------------------------------------------------------------------------------+
| monitor | Monitor the execution of specified Class and its method |
+----------+----------------------------------------------------------------------------------+
| watch | Display the details of specified class and method |
+----------+----------------------------------------------------------------------------------+
| tt | Time Tunnel |
+----------+----------------------------------------------------------------------------------+
| stack | Display the stack trace of specified class and method |
+----------+----------------------------------------------------------------------------------+
| ptrace | Display the detailed thread path stack of specified class and method |
+----------+----------------------------------------------------------------------------------+
| trace | Display the detailed thread stack of specified class and method |
| js | Enhanced JavaScript |
+----------+----------------------------------------------------------------------------------+
| session | Display current session information |
+----------+----------------------------------------------------------------------------------+
| quit | Quit Greys console |
+----------+----------------------------------------------------------------------------------+
| version | Display Greys version |
+----------+----------------------------------------------------------------------------------+
| jvm | Display the target JVM information |
+----------+----------------------------------------------------------------------------------+
| reset | Reset all the enhanced classes |
+----------+----------------------------------------------------------------------------------+
| shutdown | Shut down Greys server and exit the console |
+----------+----------------------------------------------------------------------------------+
| help | Display Greys Help |
+----------+----------------------------------------------------------------------------------+
Affect(row-cnt:1) cost in 9 ms.
ga?>
嗯，囋囋，我知道我的英文翻译很烂，就不用吐槽了。期望能有人能帮我重新打理英文的帮助界面和英文xwiki，小生感激不尽！
3.2.2 查看命令详细帮助
help命令同时也支持对其他命令的一个解释说明，比如我们键入help watch，greys将会返回watch命令的所有参数解释、用法介绍等详细信息。
ga?>help watch
+---------+----------------------------------------------------------------------------------+
| USAGE | -[bfesx:En:] class-pattern method-pattern express condition-express |
| | Display the details of specified class and method |
+---------+----------------------------------------------------------------------------------+
| OPTIONS | [b] | Watch before invocation |
| | -----------------+-------------------------------------------------------------- |
| | [f] | Watch after invocation |
| | -----------------+-------------------------------------------------------------- |
| | [e] | Watch after throw exception |
| | -----------------+-------------------------------------------------------------- |
| | [s] | Watch after successful invocation |
| | -----------------+-------------------------------------------------------------- |
| | [x:] | Expand level of object (0 by default) |
| | -----------------+-------------------------------------------------------------- |
| | [E] | Enable regular expression to match (wildcard matching by def |
| | | ault) |
| | -----------------+-------------------------------------------------------------- |
| | [n:] | Threshold of execution times |
| | -----------------+-------------------------------------------------------------- |
| | class-pattern | Path and classname of Pattern Matching |
| | -----------------+-------------------------------------------------------------- |
| | method-pattern | Method of Pattern Matching |
| | -----------------+-------------------------------------------------------------- |
| | express | express, write by OGNL. |
| | | |
| | | FOR EXAMPLE params[0] |
| | | params[0]+params[1] |
| | | returnObj |
| | | throwExp |
| | | target |
| | | clazz |
| | | method |
| | | |
| | | THE STRUCTURE |
| | | target : the object |
| | | clazz : the object's class |
| | | method : the constructor or method |
| | | params[0..n] : the parameters of method |
| | | returnObj : the returned object of method |
| | | throwExp : the throw exception of method |
| | | isReturn : the method ended by return |
| | | isThrow : the method ended by throwing exception |
| | -----------------+-------------------------------------------------------------- |
| | condition-expre | Conditional expression by OGNL |
| | ss | |
| | | FOR EXAMPLE |
| | | TRUE : 1==1 |
| | | TRUE : true |
| | | FALSE : false |
| | | TRUE : params.length>=0 |
| | | FALSE : 1==2 |
| | | |
| | | THE STRUCTURE |
| | | target : the object |
| | | clazz : the object's class |
| | | method : the constructor or method |
| | | params[0..n] : the parameters of method |
| | | returnObj : the returned object of method |
| | | throwExp : the throw exception of method |
| | | isReturn : the method ended by return |
| | | isThrow : the method ended by throwing exception |
+---------+----------------------------------------------------------------------------------+
| EXAMPLE | watch -Eb org\.apache\.commons\.lang\.StringUtils isBlank params[0] |
| | watch -b org.apache.commons.lang.StringUtils isBlank params[0] |
| | watch -f org.apache.commons.lang.StringUtils isBlank returnObj |
| | watch -bf *StringUtils isBlank params[0] |
| | watch *StringUtils isBlank params[0] |
| | watch *StringUtils isBlank params[0] params[0].length==1 |
+---------+----------------------------------------------------------------------------------+
Affect(row-cnt:1) cost in 15 ms.
ga?>
3.2.3 帮助信息组成
帮助文档分成Usage、Options、Example三个区域，分别是用途说明、参数列表、实际例子
ga?>help session
+---------+----------------------------------------------------------------------------------+
| USAGE | -[c:] |
| | Display current session information |
+---------+----------------------------------------------------------------------------------+
| OPTIONS | [c:] | Modify the character set of session |
+---------+----------------------------------------------------------------------------------+
| EXAMPLE | session |
| | session -c GBK |
| | session -c UTF-8 |
+---------+----------------------------------------------------------------------------------+
Affect(row-cnt:1) cost in 2 ms.
ga?>
3.2.4 参数选项说明
[]中的参数为选填项，比如[d]，意思是该命令可接受一个名称为d的选填参数，且不用参数值。
[:]中的参数则为选填，但有值的参数，比如[c:]
class-pattern／method-pattern，这两个参数为隐性参数，即在输入的时候不需要特意声明参数。class-pattern为类路径.类名称的表达式匹配，method-pattern则为方法名的表达式匹配。
3.3 sc命令
“Search-Class”的简写，这个命令能搜索出所有已经加载到JVM中的Class信息。
3.3.1 参数说明
3.3.2 使用参考
ga?>sc -df *alibaba.Address
+------------------+-----------------------------------------------+
| class-info | com.alibaba.Address |
+------------------+-----------------------------------------------+
| code-source | /Users/vlinux/temp/agent-test/target/ |
+------------------+-----------------------------------------------+
| name | com.alibaba.Address |
+------------------+-----------------------------------------------+
| isInterface | false |
+------------------+-----------------------------------------------+
| isAnnotation | false |
+------------------+-----------------------------------------------+
| isEnum | false |
+------------------+-----------------------------------------------+
| isAnonymousClass | false |
+------------------+-----------------------------------------------+
| isArray | false |
+------------------+-----------------------------------------------+
| isLocalClass | false |
+------------------+-----------------------------------------------+
| isMemberClass | false |
+------------------+-----------------------------------------------+
| isPrimitive | false |
+------------------+-----------------------------------------------+
| isSynthetic | false |
+------------------+-----------------------------------------------+
| simple-name | Address |
+------------------+-----------------------------------------------+
| modifier | public |
+------------------+-----------------------------------------------+
| annotation | |
+------------------+-----------------------------------------------+
| interfaces | |
+------------------+-----------------------------------------------+
| super-class | com.alibaba.CountObject |
| | `-java.lang.Object |
+------------------+-----------------------------------------------+
| class-loader | sun.misc.Launcher$AppClassLoader@2a139a55 |
| | `-sun.misc.Launcher$ExtClassLoader@5fb20bfd |
+------------------+-----------------------------------------------+
| fields | modifier : private |
| | type : java.lang.String |
| | name : username |
| | |
| | modifier : private |
| | type : int |
| | name : addressId |
| | |
| | modifier : private |
| | type : java.lang.String |
| | name : addressName |
| | |
+------------------+-----------------------------------------------+
Affect(row-cnt:1) cost in 9 ms.
ga?>
3.4 sm命令
“Search-Method”的简写，这个命令能搜索出所有已经加载了Class信息的方法信息。
3.4.1 参数说明
3.4.2 使用参考
ga?>sm -d *alibaba.Address *
+-----------------------------+-------------------------------------------------+
| DECLARED-CLASS | VISIBLE-METHOD |
+-----------------------------+-------------------------------------------------+
| com.alibaba.Address | declaring-class : class com.alibaba.Address |
| | method-name : getAddressId |
| | modifier : public |
| | annotation : |
| | parameters : |
| | return : int |
| | exceptions : |
+-----------------------------+-------------------------------------------------+
| com.alibaba.Address | declaring-class : class com.alibaba.Address |
| | method-name : getAddressName |
| | modifier : public |
| | annotation : |
| | parameters : |
| | return : java.lang.String |
| | exceptions : |
+-----------------------------+-------------------------------------------------+
| com.alibaba.Address | declaring-class : class com.alibaba.CountObject |
| `-com.alibaba.CountObject | method-name : finalize |
| | modifier : protected |
| | annotation : |
| | parameters : |
| | return : void |
| | exceptions : java.lang.Throwable |
+-----------------------------+-------------------------------------------------+
| com.alibaba.Address | declaring-class : class com.alibaba.CountObject |
| `-com.alibaba.CountObject | method-name : count |
| | modifier : public |
| | annotation : |
| | parameters : |
| | return : int |
| | exceptions : |
+-----------------------------+-------------------------------------------------+
Affect(row-cnt:4) cost in 9 ms.
ga?>
3.5 monitor命令(监控方法成功失败的次数)
对匹配class-pattern／method-pattern的类.方法的调用进行监控。
monitor命令是介绍到的第一个非实时返回命令，实时返回命令是输入之后立即返回，而非实时返回的命令，则是不断的等待目标Java进程返回信息，直到用户输入Ctrl+D为止。服务端是以任务的形式在后台跑任务，植入的代码随着任务的中止而停止执行，所以任务关闭后，不会对原有性能产生太大影响，而且原则上，任何Greys的命令也不会引起任何原有业务逻辑的改变。
3.5.1 监控的维度说明
3.5.2 参数说明
方法拥有一个命名参数[c:]，意思是统计周期（cycle of output），拥有一个整形的参数值
3.5.3 使用参考
ga?>monitor -c 5 *alibaba*Test printAddress
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 22 ms.
+-----------+-------+--------+-------+---------+------+-----------+------------+------------+------------+
| TIMESTAMP | CLASS | METHOD | TOTAL | SUCCESS | FAIL | FAIL-RATE | AVG-RT(ms) | MIN-RT(ms) | MAX-RT(ms) |
+-----------+-------+--------+-------+---------+------+-----------+------------+------------+------------+
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
| TIMESTAMP | CLASS | METHOD | TOTAL | SUCCESS | FAIL | FAIL-RATE | AVG-RT(ms) | MIN-RT(ms) | MAX-RT(ms) |
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
| 2015-12-06 16:34:56 | com.alibaba.AgentTest | printAddress | 5 | 3 | 2 | 40.00% | 0.20 | 0 | 1 |
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
| TIMESTAMP | CLASS | METHOD | TOTAL | SUCCESS | FAIL | FAIL-RATE | AVG-RT(ms) | MIN-RT(ms) | MAX-RT(ms) |
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
| 2015-12-06 16:35:01 | com.alibaba.AgentTest | printAddress | 5 | 3 | 2 | 40.00% | 0.00 | 0 | 0 |
+---------------------+-----------------------+--------------+-------+---------+------+-----------+------------+------------+------------+
ga?>
3.6 trace命令
命令能主动搜索class-pattern／method-pattern所渲染的方法调用路径，渲染和统计整个调用链路上的所有性能开销和追踪调用链路。
3.6.1 参数说明
3.6.2 注意事项
trace能方便的帮助你定位和发现因RT高而导致的性能问题缺陷，但其每次只能跟踪一级方法的调用链路，目前暂时没有精力去解决往下几个层级的调用。如果真有需求可以Issues我。
3.6.3 使用参考
ga?>trace com.alibaba.manager.DefaultAddressManager toStringPass2
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 19 ms.
`---+Tracing for : thread_name="agent-test-address-printer" thread_id=0xb;is_daemon=false;priority=5;
`---+[0,0ms]com.alibaba.manager.DefaultAddressManager:toStringPass2()
+---[0,0ms]com.alibaba.Address:getAddressId()
+---[0,0ms]com.alibaba.Address:getAddressId()
+---[0,0ms]java.lang.Integer:valueOf()
+---[0,0ms]com.alibaba.Address:getAddressName()
+---[0,0ms]com.alibaba.Address:count()
+---[0,0ms]java.lang.Integer:valueOf()
`---[0,0ms]java.lang.String:format()
是不是很眼熟，没错，在JProfiler等收费软件中你曾经见识过类似的功能，这里你通过命令就能打印出指定调用路径。
[10,1ms]的含义，10所代表的含义是：当前节点的整体耗时；1的含义是：当前节点在当前步骤的耗时；两者之间用逗号分割，单位为毫秒。
3.7 ptrace命令
3.7.1 命令解释
命令为trace命令的强化版，通过指定渲染路径来完成对方法执行路径的渲染过程
命令能主动搜索tracing-path-pattern所渲染的路径，渲染和统计整个调用链路上的所有性能开销和追踪调用链路。
3.7.2 参数说明
3.7.3 使用例子
ga?>ptrace -t *alibaba*Test printAddress --path=*alibaba*
Press Ctrl+D to abort.
Affect(class-cnt:10 , method-cnt:36) cost in 148 ms.
`---+pTracing for : thread_name="agent-test-address-printer" thread_id=0xb;is_daemon=false;priority=5;process=1004;
`---+[2,2ms]com.alibaba.AgentTest:printAddress(); index=1021;
+---+[1,1ms]com.alibaba.manager.DefaultAddressManager:newAddress(); index=1014;
| +---[1,1ms]com.alibaba.CountObject:<init>(); index=1012;
| `---[1,0ms]com.alibaba.Address:<init>(); index=1013;
+---+[2,1ms]com.alibaba.manager.DefaultAddressManager:toString(); index=1020;
| +---+[2,1ms]com.alibaba.manager.DefaultAddressManager:toStringPass1(); index=1019;
| | +---+[2,1ms]com.alibaba.manager.DefaultAddressManager:toStringPass2(); index=1017;
| | | +---[1,0ms]com.alibaba.Address:getAddressId(); index=1015;
| | | +---+[1,0ms]com.alibaba.manager.DefaultAddressManager:throwRuntimeException(); index=1016;
| | | | `---[1,0ms]throw:java.lang.RuntimeException
| | | `---[1,0ms]throw:java.lang.RuntimeException
| | +---[2,0ms]com.alibaba.AddressException:<init>(); index=1018;
| | `---[2,0ms]throw:com.alibaba.AddressException
| `---[2,0ms]throw:com.alibaba.AddressException
`---[2,0ms]throw:com.alibaba.AddressException
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | PROCESS-ID | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1012 | 1004 | 2015-12-06 16:46:49 | 0 | true | false | 0x943cff | CountObject | <init> |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1013 | 1004 | 2015-12-06 16:46:49 | 0 | true | false | 0x943cff | Address | <init> |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1014 | 1004 | 2015-12-06 16:46:49 | 1 | true | false | 0x6833b8a5 | DefaultAddressManager | newAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1015 | 1004 | 2015-12-06 16:46:49 | 0 | true | false | 0x943cff | Address | getAddressId |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1016 | 1004 | 2015-12-06 16:46:49 | 0 | false | true | 0x6833b8a5 | DefaultAddressManager | throwRuntimeException |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1017 | 1004 | 2015-12-06 16:46:49 | 0 | false | true | 0x6833b8a5 | DefaultAddressManager | toStringPass2 |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1018 | 1004 | 2015-12-06 16:46:49 | 0 | true | false | 0x67e7a923 | AddressException | <init> |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1019 | 1004 | 2015-12-06 16:46:49 | 1 | false | true | 0x6833b8a5 | DefaultAddressManager | toStringPass1 |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1020 | 1004 | 2015-12-06 16:46:49 | 1 | false | true | 0x6833b8a5 | DefaultAddressManager | toString |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1021 | 1004 | 2015-12-06 16:46:49 | 2 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
3.8 watch命令
能方便的让你观察到指定方法的调用情况。能观察到的范围为：返回值、抛出异常、入参，通过编写OGNL表达式进行对应变量的查看。
3.8.1 参数说明
watch的参数比较多，主要是因为它能在4个不同的场景观察对象
这里重点要说明的是观察表达式，观察表达式的构成主要由OGNL表达式组成，所以你可以这样写params[0]+“$”+target，只要是一个合法的OGNL表达式，都能被正常支持。
观察的维度也比较多，主要体现在参数advice的数据结构上。Advice参数最主要是封装了通知节点的所有信息。参考表达式核心变量中关于该节点的描述:https://github.com/oldmanpushcart/greys-anatomy/wiki/greys-pdf#advice-class。
3.8.2 使用参考
ga?>watch -b *Test printAddress '"params[0]="+params[0]'
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 32 ms.
params[0]=3163
params[0]=3164
params[0]=3165
params[0]=3166
这里需要说明的一个参数x，这个参数决定了输出的结果的层级遍历输出对象，当加上这个参数之后，greys会将输出的对象按照指定层级进行剥开。-x 1表明展开第1层级。
ga?>watch -s com.alibaba.manager.DefaultAddressManager newAddress returnObj -x 1
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 34 ms.
@Address[
username=@String[dukun],
addressId=@Integer[3244],
addressName=@String[ADDRESS],
]
3.9 tt命令
时间隧道命令是我在使用watch命令进行问题排查的时候衍生出来的想法。watch虽然很方便和灵活，但需要提前想清楚观察表达式的拼写，这对排查问题而言要求太高，因为很多时候我们并不清楚问题出自于何方，只能靠蛛丝马迹进行猜测。
这个时候如果能记录下当时方法调用的所有入参和返回值、抛出的异常会对整个问题的思考与判断非常有帮助。
于是乎，TimeTunnel命令就诞生了。
3.9.1 记录方法的调用
1) 基本用法
对于一个最基本的使用来说，就是记录下当前方法的每次调用环境现场。
ga?>tt -t -n 3 *Test printAddress
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 33 ms.
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | PROCESS-ID | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1036 | 1009 | 2015-12-06 16:57:06 | 1 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1037 | 1010 | 2015-12-06 16:57:07 | 0 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1038 | 1011 | 2015-12-06 16:57:08 | 0 | true | false | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
ga?>
- 命令参数解析
-t :tt命令有很多个主参数，-t就是其中之一。这个参数的表明希望记录下类*Test的print方法的每次执行情况。
-n 3 :当你执行一个调用量不高的方法时可能你还能有足够的时间用CTRL+D中断tt命令记录的过程，但如果遇到调用量非常大的方法，瞬间就能将你的JVM内存撑爆。
此时你可以通过-n参数指定你需要记录的次数，当达到记录次数时greys会主动中断tt命令的记录过程，避免人工操作无法停止的情况。
3.9.2 表格字段说明
3.9.3 条件表达式
不知道大家是否有在使用过程中遇到以下困惑
似乎很难区分出重载的方法
我只需要观察特定参数，但是tt却全部都给我记录了下来
从1.6.0.6版本之后，应广大妇女群众的要求，增加了条件表达式，这样你可以通过简单的条件表达式解决上边的困惑。
条件表达式也是用OGNL来编写，核心的判断对象依然是Advice对象。
除了tt命令之外，watch、trace、stack命令也都支持条件表达式
1)解决方法重载
tt -t *Test print params[0].length==1
通过制定参数个数的形式解决不同的方法签名，如果参数个数一样，你还可以这样写
tt -t *Test print 'params[1].class == Integer.class'
2) 解决指定参数
tt -t *Test print params[0].mobile=="13989838402"
3) 检索调用记录
当你用tt记录了一大片的时间片段之后，你希望能从中筛选出自己需要的时间片段，这个时候你就需要对现有记录进行检索。
假设我们有这些记录
ga?>tt -l
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | PROCESS-ID | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1047 | 1020 | 2015-12-06 17:03:00 | 1 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1048 | 1021 | 2015-12-06 17:03:01 | 0 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1049 | 1022 | 2015-12-06 17:03:01 | 1 | true | false | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1050 | 1023 | 2015-12-06 17:03:01 | 0 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1051 | 1024 | 2015-12-06 17:03:02 | 1 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1052 | 1025 | 2015-12-06 17:03:02 | 1 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1053 | 1026 | 2015-12-06 17:03:02 | 0 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1054 | 1027 | 2015-12-06 17:03:03 | 0 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1055 | 1028 | 2015-12-06 17:03:03 | 0 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1056 | 1029 | 2015-12-06 17:03:03 | 0 | true | false | 0x2062a3d | AgentTest | printUser |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
Affect(row-cnt:10) cost in 3 ms.
ga?>
我需要筛选出printAddress方法的调用信息
ga?>tt -s method.name=="printAddress"
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | PROCESS-ID | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1049 | 1022 | 2015-12-06 17:03:01 | 1 | true | false | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1052 | 1025 | 2015-12-06 17:03:02 | 1 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1055 | 1028 | 2015-12-06 17:03:03 | 0 | false | true | 0x2062a3d | AgentTest | printAddress |
+----------+------------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
Affect(row-cnt:3) cost in 8 ms.
ga?>
你需要一个-s参数。同样的，搜索表达式的核心对象依旧是Advice对象。
4) 查看调用信息
对于具体一个时间片的信息而言，你可以通过-i参数后边跟着对应的INDEX编号查看到他的详细信息。
ga?>tt -i 1055
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| INDEX | 1055 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| PROCESS-ID | 1028 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| GMT-CREATE | 2015-12-06 17:03:03 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| COST(ms) | 0 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| OBJECT | 0x2062a3d |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| CLASS | com.alibaba.AgentTest |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| METHOD | printAddress |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| IS-RETURN | false |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| IS-EXCEPTION | true |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| PARAMETERS[0] | 3789 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| THROW-EXCEPTION | com.alibaba.AddressException: java.lang.RuntimeException: test |
| | at com.alibaba.manager.DefaultAddressManager.toStringPass1(DefaultAddressManager.java:22) |
| | at com.alibaba.manager.DefaultAddressManager.toString(DefaultAddressManager.java:15) |
| | at com.alibaba.AgentTest.printAddress(AgentTest.java:80) |
| | at com.alibaba.AgentTest.access$300(AgentTest.java:7) |
| | at com.alibaba.AgentTest$3.null(Unknown Source) |
| | Caused by: java.lang.RuntimeException: test |
| | at com.alibaba.manager.DefaultAddressManager.throwRuntimeException(DefaultAddressManager.java:39) |
| | at com.alibaba.manager.DefaultAddressManager.toStringPass2(DefaultAddressManager.java:29) |
| | at com.alibaba.manager.DefaultAddressManager.toStringPass1(DefaultAddressManager.java:20) |
| | ... 4 more |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| STACK | thread_name="agent-test-address-printer" thread_id=0xb;is_daemon=false;priority=5; |
| | @com.alibaba.AgentTest.access$300() |
| | at com.alibaba.AgentTest$3.null(null:-1) |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
Affect(row-cnt:1) cost in 7 ms.
ga?>
5) 重做一次调用
当你少少做了一些调整之后，你可能需要前端系统重新触发一次你的调用，此时得求爷爷告奶奶的需要前端配合联调的同学再次发起一次调用。而有些场景下，这个调用不是这么好触发的。
tt命令由于保存了当时调用的所有现场信息，所以我们可以自己主动对一个INDEX编号的时间片自主发起一次调用，从而解放你的沟通成本。此时你需要-p参数。
ga?>tt -i 1055 -p
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| INDEX | 1055 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| PROCESS-ID | 1028 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| GMT-CREATE | 2015-12-06 17:03:03 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| COST(ms) | 1 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| OBJECT | 0x2062a3d |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| CLASS | com.alibaba.AgentTest |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| METHOD | printAddress |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| IS-RETURN | true |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| IS-EXCEPTION | false |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| PARAMETERS[0] | 3789 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| RETURN-OBJ | 1 |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
| STACK | thread_name="ga-command-execute-daemon" thread_id=0x22;is_daemon=true;priority=9; |
| | @com.github.ompc.greys.core.command.TimeTunnelCommand$6.action() |
| | at com.github.ompc.greys.core.server.DefaultCommandHandler.execute(DefaultCommandHandler.java:210) |
| | at com.github.ompc.greys.core.server.DefaultCommandHandler.executeCommand(DefaultCommandHandler.java:87) |
| | at com.github.ompc.greys.core.server.GaServer$4.run(GaServer.java:332) |
| | at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) |
| | at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) |
| | at java.lang.Thread.run(Thread.java:745) |
+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
Time fragment[1055] successfully replayed.
Affect(row-cnt:1) cost in 2 ms.
ga?>
你会发现结果虽然一样，但调用的路径发生了变化，有原来的程序发起变成了greys自己的内部线程发起的调用了。
得益于Greys的ClassLoader隔离策略，Greys在内部自己发起线程请求调用的时候，依然采用的是目标类所归属的ClassLoader，所以在OSGI、Tomcat容器等场景下，Greys依然能正确的重做此次调用。
6) 需要强调的点
1.ThreadLocal信息丢失
很多框架偷偷的将一些环境变量信息塞到了发起调用线程的ThreadLocal中，由于调用线程发生了变化，这些ThreadLocal线程信息无法通过greys保存，所以这些信息将会丢失。
一些常见的CASE比如：阿里鹰眼系统的TraceId、阿里全链路平台的压测流量标记位。
2.引用的对象
需要强调的是，tt命令是将当前环境的对象引用保存起来，但仅仅也只能保存一个引用而已。如果方法内部对入参进行了变更，或者返回的对象经过了后续的处理，那么在tt查看的时候将无法看到当时最准确的值。这也是为什么watch命令存在的意义。
3.10 stack命令
很多时候我们都知道一个方法被执行，但这个方法被执行的路径非常多。或者你根本就不知道这个方法是从那里被执行了，正在郁闷，正在彷徨。此时你需要的是stack命令。
3.10.1 参数说明
3.10.2 使用例子
ga?>stack com.alibaba.manager.DefaultAddressManager newAddress
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
thread_name="agent-test-address-printer" thread_id=0xb;is_daemon=false;priority=5;
@java.lang.reflect.Method.invoke()
at com.alibaba.manager.DefaultAddressManager.newAddress(DefaultAddressManager.java:-1)
at com.alibaba.AgentTest.printAddress(AgentTest.java:73)
at com.alibaba.AgentTest.access$300(AgentTest.java:7)
at com.alibaba.AgentTest$3.null(null:-1)
3.11 js命令
js命令几经波折，几乎在两个重要版本中绝迹，所以我不得不先介绍这个命令的历史背景。
在GREYS的1.5版本时代，字节码增强使用的是javassist进行，里面的黑盒严重，我比较难介入和调试其中的字节码生成过程。在这种情况下我们发现了一个JavaScript引擎rhino与Javassist结合存在严重漏洞的问题却没有更多调试的手段。
考虑到性能、后续扩展的发展，GREYS从1.6开始替换成asm，之后我拥有了最精细的字节码控制权限。在1.7.4.0版本中我恢复了GREYS对JavaScript的支持，并通过了之前BUG的测试。一切正常。
现有的GREYS命令不能完全满足所有人的需求，有一些需要根据业务场景进行个性化处理的场景，现有的GREYS命令就比较难支持了。
比如我需要查看目标JVM中所有SQL的执行情况，因为java.sql.PreparedStatement在不同的JDBC协议实现下，存储的原生SQL获取的方式也不尽相同，JDBC规范中并未提供标准的API获取原生的SQL。这个时候需要对原生SQL进行统计就必须进行个性化开发。
3.11.1 参数说明
3.11.2 使用例子
1) 运行第一个JavaScript
1.目标
我们编写一个watch.js脚本，这个脚本的主要是在方法运行之前输出方法的大概信息。类似于
watch -b *Test print* clazz.name+"."+method.name+"()"
2.步骤
首先我们先生成一个脚本文件
touch /tmp/watch.js
然后往里面写入以下内容
require(['greys'], function (greys) {
greys.watching({
before: function (o, a) {
o.println(a.clazz.name+"."+a.method.name+"()");
},
});
})
接下来启动GREYS之行命令运行
js *Test print* /tmp/watch.js
执行效果
ga?>js *Test print* /tmp/watch.js
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:2) cost in 35 ms.
com.alibaba.AgentTest.printAddress()
com.alibaba.AgentTest.printUser()
com.alibaba.AgentTest.printAddress()
com.alibaba.AgentTest.printUser()
com.alibaba.AgentTest.printUser()
com.alibaba.AgentTest.printAddress()
2) 运行一个远程的JavaScript
除了本地临时写代码之外，你也可以将平时积累好的脚本代码放在远程服务端（比如Github），可以使用远程加载的方式运行。
提前准备了一个watch.js文件，内容和原来差不多
require(['greys'], function (greys) {
greys.watching({
before: function (o, a) {
o.println('call from remote script: '+a.clazz.name+"."+a.method.name+"()");
},
});
}
1.执行命令
js *Test print* watch.js
2.执行效果
ga?>js *Test print* watch.js
Press Ctrl+D to abort.
Affect(class-cnt:1 , method-cnt:2) cost in 43 ms.
call from remote script: com.alibaba.AgentTest.printUser()
call from remote script: com.alibaba.AgentTest.printAddress()
call from remote script: com.alibaba.AgentTest.printUser()
call from remote script: com.alibaba.AgentTest.printAddress()
更详细的命令帮助可以见JavaScriptSupport:https://github.com/oldmanpushcart/greys-anatomy/wiki/JavaScriptSupport
3.12 version命令
这估计是最好理解的一个命令了，输出当前Greys的版本号，这里输出的版本号不是Client的版本，而是当前加载到目标Java进程中的Greys版本。
3.13 quit命令
这里说明下与shutdown命令的区别，quit命令仅仅是将客户端关闭，而不会将目标Java进程中的与Greys的Server关闭。所以如果仅仅是希望简单的退出Greys控制台，则使用quit命令足矣。
一旦Greys控制台退出，控制台所绑定的Session将会被关闭，Session上所有存活的事务也都会被中止并释放。
3.14 shutdown命令
命令执行后将会完成两件事：
关闭Greys在目标Java所加载的Socket服务，所占用的端口将会被释放，同时，本地的Greys控制台也因为远程Socket关闭而主动退出。
重置所有被Greys所增强的类。同reset命令。
3.15 reset命令
重置指定被Greys所增强的类。
3.16 session命令
会话命令是在1.6版本之后新增，整个命令的定位是维护好会话级的参数。目前可修改的就一个字符集。
3.16.1 参数说明
3.16.2 使用例子
1) 直接查看会话信息
ga?>session
+------------+------------------+
| JAVA_PID | 8609 |
+------------+------------------+
| SESSION_ID | 2 |
+------------+------------------+
| DURATION | 300000 |
+------------+------------------+
| CHARSET | UTF-8 |
+------------+------------------+
| PROMPT | ga?> |
+------------+------------------+
| FROM | /127.0.0.1:58186 |
+------------+------------------+
| TO | /127.0.0.1:3658 |
+------------+------------------+
Affect(row-cnt:1) cost in 0 ms.
ga?>
2) 修改字符集
ga?>session -c GBK
change charset before[UTF-8] -> new[GBK]
Affect(row-cnt:1) cost in 26 ms.
3.17 jvm命令
查看当前JVM的信息，无参数。
ga?>jvm
+--------------------+-----------------------------------------------------------------------------------------------------+
| CATEGORY | INFO |
+--------------------+-----------------------------------------------------------------------------------------------------+
| RUNTIME | MACHINE-NAME : [email protected] |
| | JVM-START-TIME : 2015-06-16 22:12:20 |
| | MANAGEMENT-SPEC-VERSION : 1.2 |
| | SPEC-NAME : Java Virtual Machine Specification |
| | SPEC-VENDOR : Oracle Corporation |
| | SPEC-VERSION : 1.8 |
| | VM-NAME : Java HotSpot(TM) 64-Bit Server VM |
| | VM-VENDOR : Oracle Corporation |
| | VM-VERSION : 25.25-b02 |
| | INPUT-ARGUMENTS : [] |
| | CLASS-PATH : . |
| | BOOT-CLASS-PATH : /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/li |
| | b/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Conte |
| | nts/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_25.j |
| | dk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachin |
| | es/jdk1.8.0_25.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVir |
| | tualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/jce.jar:/Library/Jav |
| | a/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/charsets.ja |
| | r:/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/l |
| | ib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/H |
| | ome/jre/classes |
| | LIBRARY-PATH : /Users/vlinux/Library/Java/Extensions:/Library/Java/Extensions:/Networ |
| | k/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java |
| | :. |
+--------------------+-----------------------------------------------------------------------------------------------------+
| CLASS-LOADING | LOADED-CLASS-COUNT : 3045 |
| | TOTAL-LOADED-CLASS-COUNT : 3045 |
| | UNLOADED-CLASS-COUNT : 0 |
| | IS-VERBOSE : false |
+--------------------+-----------------------------------------------------------------------------------------------------+
| COMPILATION | NAME : HotSpot 64-Bit Tiered Compilers |
| | TOTAL-COMPILE-TIME : 8903(ms) |
+--------------------+-----------------------------------------------------------------------------------------------------+
| GARBAGE-COLLECTORS | PS Scavenge : 4/40(ms) |
| | [count/time] |
| | PS MarkSweep : 0/0(ms) |
| | [count/time] |
+--------------------+-----------------------------------------------------------------------------------------------------+
| MEMORY-MANAGERS | CodeCacheManager : Code Cache |
| | Metaspace Manager : Metaspace |
| | Compressed Class Space |
| | PS Scavenge : PS Eden Space |
| | PS Survivor Space |
| | PS MarkSweep : PS Eden Space |
| | PS Survivor Space |
| | PS Old Gen |
+--------------------+-----------------------------------------------------------------------------------------------------+
| MEMORY | HEAP-MEMORY-USAGE : 163053568/134217728/1908932608/54796080 |
| | [committed/init/max/used] |
| | NO-HEAP-MEMORY-USAGE : 32571392/2555904/-1/31757608 |
| | [committed/init/max/used] |
| | PENDING-FINALIZE-COUNT : 0 |
+--------------------+-----------------------------------------------------------------------------------------------------+
| OPERATING-SYSTEM | OS : Mac OS X |
| | ARCH : x86_64 |
| | PROCESSORS-COUNT : 4 |
| | LOAD-AVERAGE : 2.50634765625 |
| | VERSION : 10.10.3 |
+--------------------+-----------------------------------------------------------------------------------------------------+
| THREAD | COUNT : 8 |
| | DAEMON-COUNT : 7 |
| | LIVE-COUNT : 9 |
| | STARTED-COUNT : 19 |
+--------------------+-----------------------------------------------------------------------------------------------------+
Affect cost in 22 ms.