Java代码
1.检查系统交换空间的使用情况。
[root@jumper usr]# free
total used free shared buffers cached
Mem: 513980 493640 20340 0 143808 271780
-/+ buffers/cache: 78052 435928
Swap: 1052248 21256 1030992
2.在合适的位置创建一个交换文件。
[root@jumper usr]# mkdir swap
[root@jumper usr]# cd swap
[root @ jumper switch] # ddif=/dev/zeroof=swap file bs=1024count=1000000//Add the first generation.
10000+0 records in
10000+0 records out
[root@jumper swap]# ls -al
total 10024
Drwxr-xr-x 2 root 4096 July 28 14:58.
Drwxr-xr-x 19 root 4096 July 28 14:57 .
-rw-r-r-1 Root 10240000 Exchange files at 14: 58 on July 28.
[root@jumper swap]# mkswap swapfile
Setting up swapspace version 1, size=9996 KiB
3.激活交换文件
[root@jumper swap]# swapon swapfile
[root@jumper swap]# ls -l
total 10016
-rw-r-r-1 Root 10240000 Exchange files at 14: 58 on July 28.
[root@jumper swap]# free
total used free shared buffers cached
Mem: 513980 505052 8928 0 143900 282288
-/+ buffers/cache: 78864 435116
Swap: 1062240 21256 1040984
，如果要使引导自启用，需要修改/etc/fstab文件中的交换行：
/root/swap/swapfile swap swap defaults 0 0