2018-12-11编译时：virtual memory exhausted: Cannot allocate memory

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

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@hz mnt]# swapoff swap

[root@hz mnt]# rm -f /opt/images/swap