当swap内存不足时，可以用硬盘空间创建新的swap

[root@thankinglove sbin]# free -m                       total       used       free     shared    buffers     cachedMem:           992        923         69         12          1        306-/+ buffers/cache:        615        377Swap:            0          0          0[root@thankinglove sbin]# mkdir -p /opt/p_w_picpaths[root@thankinglove sbin]# rm -rf /opt/p_w_picpaths/swap[root@thankinglove sbin]# dd if=/dev/zero of=/opt/p_w_picpaths/swap bs=1024 count=20480002048000+0 records in2048000+0 records out2097152000 bytes (2.1 GB) copied, 41.3215 s, 50.8 MB/s[root@thankinglove sbin]# mkswap /opt/p_w_picpaths/swapSetting up swapspace version 1, size = 2047996 KiBno label, UUID=cb3463eb-fed5-448d-9727-506e874a5741[root@thankinglove sbin]# swapon /opt/p_w_picpaths/swapswapon: /opt/p_w_picpaths/swap: insecure permissions 0644, 0600 suggested.[root@thankinglove sbin]# free -m             total       used       free     shared    buffers     cachedMem:           992        924         68         12          0        310-/+ buffers/cache:        613        379Swap:         1999          0       1999

当使用完毕后，可以关闭增加的swap

[root@thankinglove sbin]# swapoff /opt/p_w_picpaths/swap[root@thankinglove sbin]# rm -rf /opt/p_w_picpaths/swap

http://blog.csdn.net/taiyang1987912/article/details/41695895