virtual memory exhausted: Cannot allocate memory
2017-11-16 23:39
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一、问题
当安装虚拟机时系统时没有设置swap大小或设置内存太小,编译程序会出现virtual memory exhausted: Cannot allocate memory的问题,可以用swap扩展内存的方法。
二、解决方法
在执行free -m的是时候提示Cannot allocate memory:(swap文件可以放在自己喜欢的位置如/var/swap)
[html] view plain copy print?[root@Byrd byrd]# free -m
total used free shared buffers cached
Mem: 512 108 403 0 0 28
-/+ buffers/cache: 79 432
Swap: 0 0 0
[root@Byrd ~]# mkdir /opt/images/
[root@Byrd ~]# rm -rf /opt/images/swap
[root@Byrd ~]# dd if=/dev/zero of=/opt/images/swap bs=1024 count=2048000
2048000+0 records in
2048000+0 records out
2097152000 bytes (2.1 GB) copied, 82.7509 s, 25.3 MB/s
[root@Byrd ~]# mkswap /opt/images/swap
mkswap: /opt/images/swap: warning: don’t erase bootbits sectors
on whole disk. Use -f to force.
Setting up swapspace version 1, size = 2047996 KiB
no label, UUID=59daeabb-d0c5-46b6-bf52-465e6b05eb0b
[root@hz mnt]# swapon /opt/images/swap
[root@hz mnt]# free -m
total used free shared buffers cached
Mem: 488 481 7 0 6 417
-/+ buffers/cache: 57 431
Swap: 999 0 999
[root@Byrd byrd]# free -m total used free shared buffers cached Mem: 512 108 403 0 0 28 -/+ buffers/cache: 79 432 Swap: 0 0 0 [root@Byrd ~]# mkdir /opt/images/ [root@Byrd ~]# rm -rf /opt/images/swap [root@Byrd ~]# dd if=/dev/zero of=/opt/images/swap bs=1024 count=2048000 2048000+0 records in 2048000+0 records out 2097152000 bytes (2.1 GB) copied, 82.7509 s, 25.3 MB/s [root@Byrd ~]# mkswap /opt/images/swap mkswap: /opt/images/swap: warning: don't erase bootbits sectors on whole disk. Use -f to force. Setting up swapspace version 1, size = 2047996 KiB no label, UUID=59daeabb-d0c5-46b6-bf52-465e6b05eb0b [root@hz mnt]# swapon /opt/images/swap [root@hz mnt]# free -m total used free shared buffers cached Mem: 488 481 7 0 6 417 -/+ buffers/cache: 57 431 Swap: 999 0 999内存太小,增加内存可以解决。
使用完毕后可以关掉swap:
[html] view plain copy print?[root@hz mnt]# swapoff swap [root@hz mnt]# rm -f /opt/images/swap
[root@hz mnt]# swapoff swap [root@hz mnt]# rm -f /opt/images/swapswap文件也可以不删除,留着以后使用,关键是你的虚拟机硬盘够用。注意!也有可能是硬盘不够了,如果是虚拟机,实在没有解决的情况下可以增大虚拟机分配的内存——说不定有奇效呢
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