启动JAR
1 | nohup java -jar xxx.jar >temp.txt & |
设置内存占用
1 | java -jar -Xms256m -Xmx512m -XX:PermSize=64M -XX:MaxPermSize=128M xxx.jar |
说明:
堆内存:最小256M,最大512M。(对象使用的内存)
永久内存:最小64M,最大128M。(类使用的内存,PermGen)
参数详解
- -Xms256m -Xmx512m 堆内存:最小256M,最大512M。(对象使用的内存)
- -XX:PermSize=64M -XX:MaxPermSize=128M 永久内存:最小64M,最大128M。(类使用的内存,PermGen)
设置日志中文编码
1 | nohup java -Dfile.encoding=utf-8 -jar xxx.jar >temp.txt & |
查看内存占用
查看pid
1 | lsof -i:8895 |
查看内存占用
1 | jmap -heap pid |
结果
Attaching to process ID 19438, please wait…
Debugger attached successfully.
Server compiler detected.
JVM version is 25.221-b11using thread-local object allocation.
Parallel GC with 2 thread(s)Heap Configuration:
MinHeapFreeRatio = 0
MaxHeapFreeRatio = 100
MaxHeapSize = 2147483648 (2048.0MB)
NewSize = 89128960 (85.0MB)
MaxNewSize = 715653120 (682.5MB)
OldSize = 179306496 (171.0MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)Heap Usage:
PS Young Generation
Eden Space:
capacity = 651689984 (621.5MB)
used = 405279136 (386.5043029785156MB)
free = 246410848 (234.99569702148438MB)
62.18894657739592% used
From Space:
capacity = 5242880 (5.0MB)
used = 4774176 (4.553009033203125MB)
free = 468704 (0.446990966796875MB)
91.0601806640625% used
To Space:
capacity = 14680064 (14.0MB)
used = 0 (0.0MB)
free = 14680064 (14.0MB)
0.0% used
PS Old Generation
capacity = 252182528 (240.5MB)
used = 38105624 (36.340354919433594MB)
free = 214076904 (204.1596450805664MB)
15.110334685835173% used27080 interned Strings occupying 2811288 bytes.
查看某个进程的对象占用对象最大的命令:
1 | jmap -histo pid | head -n 20 |
注册服务 开机自启
添加服务
新建/etc/init.d/shuatiapi.sh
文件
1 |
|
添加执行权限
给sh文件和jar可执行权限
1 | chmod +x /etc/init.d/shuatiapi.sh |
添加软连接
这一步不是必要的
我们可以把文件以软连接的方式放在服务所在目录中
1 | ln -s /data/wwwroot/8895shuatiapi/shuatiapi.sh /etc/init.d/shuatiapi.sh |
右侧的地址相当于快捷方式
设置开机启动
首先,添加为系统服务
1 | chkconfig --add shuatiapi.sh |
开机自启动
1 | chkconfig shuatiapi.sh on |
查看
1 | chkconfig --list |
启动
1 | service shuatiapi.sh start |
停用
1 | service shuatiapi.sh stop |
查看启动情况
1 | lsof -i:8895 |