下载 arthas
官方网站：https://arthas.aliyun.com/doc
[root@master ~]# curl -O https://arthas.aliyun.com/arthas-boot.jar
运行 arthas
会展示当前计算机执行的java的进程，可以通过序号+enter选择需要监控的进程，完成后进入命令行模式（第一次使用会下载15.7M的文件）
[root@master arthas]# java -jar arthas-boot.jar
[INFO] JAVA_HOME: /usr/local/java/jdk1.8.0_412/jre
[INFO] arthas-boot version: 4.0.2
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 3263 math-game.jar
1
1
[INFO] arthas home: /root/.arthas/lib/4.0.2/arthas
[INFO] The target process already listen port 3658, skip attach.
[INFO] arthas-client connect 127.0.0.1 3658
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\ \ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version 4.0.2
main_class
pid 3263
time 2024-10-18 15:17:41.285
[arthas@3263]$
官方使用手册地址：https://arthas.aliyun.com/doc/commands.html#基础命令
在官方文档命令行中可以输入指定的命令查看当前java进程的相关信息
查看jvm信息
[arthas@3263]$ jvm
RUNTIME
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MACHINE-NAME 3263@master
JVM-START-TIME 2024-10-18 15:06:15
MANAGEMENT-SPEC-VERSION 1.2
SPEC-NAME Java Virtual Machine Specification
SPEC-VENDOR Oracle Corporation
SPEC-VERSION 1.8
VM-NAME OpenJDK 64-Bit Server VM
VM-VENDOR BiSheng
VM-VERSION 25.412-b11
INPUT-ARGUMENTS []
CLASS-PATH math-game.jar
BOOT-CLASS-PATH /usr/local/java/jdk1.8.0_412/jre/lib/resources.jar:/usr/local/java/jdk1.8.0_412/jre/lib/rt.jar:/usr/local/java/jdk1.8.0_412/jre/lib/sunrsasign.jar:/usr/
local/java/jdk1.8.0_412/jre/lib/jsse.jar:/usr/local/java/jdk1.8.0_412/jre/lib/jce.jar:/usr/local/java/jdk1.8.0_412/jre/lib/charsets.jar:/usr/local/java/
jdk1.8.0_412/jre/lib/jfr.jar:/usr/local/java/jdk1.8.0_412/jre/classes
LIBRARY-PATH /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
CLASS-LOADING
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
LOADED-CLASS-COUNT 4386
TOTAL-LOADED-CLASS-COUNT 4386
UNLOADED-CLASS-COUNT 0
IS-VERBOSE false
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COMPILATION
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NAME HotSpot 64-Bit Tiered Compilers
TOTAL-COMPILE-TIME 9979
[time (ms)]
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
GARBAGE-COLLECTORS
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PS Scavenge name : PS Scavenge
[count/time (ms)] collectionCount : 4
collectionTime : 1362
PS MarkSweep name : PS MarkSweep
[count/time (ms)] collectionCount : 1
collectionTime : 821
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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 init : 65011712(62.0 MiB)
[memory in bytes] used : 32105744(30.6 MiB)
committed : 63438848(60.5 MiB)
max : 917504000(875.0 MiB)
NO-HEAP-MEMORY-USAGE init : 2555904(2.4 MiB)
[memory in bytes] used : 34259800(32.7 MiB)
committed : 35258368(33.6 MiB)
max : -1(-1 B)
PENDING-FINALIZE-COUNT 0
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OPERATING-SYSTEM
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OS Linux
ARCH amd64
PROCESSORS-COUNT 2
LOAD-AVERAGE 0.55
VERSION 3.10.0-1127.el7.x86_64
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
THREAD
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COUNT 15
DAEMON-COUNT 14
PEAK-COUNT 15
STARTED-COUNT 19
DEADLOCK-COUNT 0
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
FILE-DESCRIPTOR
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX-FILE-DESCRIPTOR-COUNT 4096
OPEN-FILE-DESCRIPTOR-COUNT 67
查看内存信息
[arthas@3263]$ memory
Memory used total max usage
heap 32M 60M 875M 3.69%
ps_eden_space 25M 31M 323M 7.81%
ps_survivor_space 0K 2560K 2560K 0.00%
ps_old_gen 7M 27M 656M 1.07%
nonheap 32M 34M -1 96.58%
code_cache 5M 5M 240M 2.30%
metaspace 24M 25M -1 96.26%
compressed_class_space 2M 3M 1024M 0.29%
direct 8K 8K - 100.01%
mapped 0K 0K - 0.00%
查看thread信息
[arthas@3263]$ thread
Threads Total: 22, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 3, TERMINATED: 0, Internal threads: 7
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTED DAEMON
-1 C1 CompilerThread1 - -1 - 5.89 0.011 0:3.211 false true
-1 C2 CompilerThread0 - -1 - 1.21 0.002 0:3.426 false true
20 arthas-command-execute system 5 RUNNABLE 0.25 0.000 0:0.330 false true
-1 VM Periodic Task Thread - -1 - 0.17 0.000 0:2.693 false true
-1 VM Thread - -1 - 0.03 0.000 0:0.358 false true
2 Reference Handler system 10 WAITING 0.0 0.000 0:0.007 false true
3 Finalizer system 8 WAITING 0.0 0.000 0:0.008 false true
4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.001 false true
8 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.081 false true
10 arthas-timer system 9 WAITING 0.0 0.000 0:0.000 false true
13 arthas-NettyHttpTelnetBootstrap-3-1 system 5 RUNNABLE 0.0 0.000 0:0.114 false true
14 arthas-NettyWebsocketTtyBootstrap-4-1 system 5 RUNNABLE 0.0 0.000 0:0.005 false true
15 arthas-NettyWebsocketTtyBootstrap-4-2 system 5 RUNNABLE 0.0 0.000 0:0.005 false true
16 arthas-shell-server system 9 TIMED_WAITING 0.0 0.000 0:0.007 false true
17 arthas-session-manager system 9 TIMED_WAITING 0.0 0.000 0:0.010 false true
19 arthas-NettyHttpTelnetBootstrap-3-2 system 5 RUNNABLE 0.0 0.000 0:0.736 false true
22 arthas-NettyHttpTelnetBootstrap-3-3 system 5 RUNNABLE 0.0 0.000 0:0.068 false true
23 arthas-NettyHttpTelnetBootstrap-3-4 system 5 RUNNABLE 0.0 0.000 0:0.173 false true
1 main main 5 TIMED_WAITING 0.0 0.000 0:1.852 false false
-1 GC task thread#1 (ParallelGC) - -1 - 0.0 0.000 0:1.734 false true
-1 GC task thread#0 (ParallelGC) - -1 - 0.0 0.000 0:1.708 false true
-1 Service Thread - -1 - 0.0 0.000 0:0.000 false true