create an emergency swapfile when the existing swap space is getting tight
%free -tom
total used free shared buffers cached
Mem: 1010 997 12 0 1 395
Swap: 2047 43 2003
Total: 3057 1041 2016
%sudo dd if=/dev/zero of=/swapfile bs=1024 count=1024000;sudo mkswap /swapfile; sudo swapon /swapfile
1024000+0 records in
1024000+0 records out
1048576000 bytes (1.0 GB) copied, 48.22 s, 21.7 MB/s
Setting up swapspace version 1, size = 1048571 kB
no label, UUID=1c269910-c4f4-441d-a65c-3cd0ff2a4f31
free -tom
total used free shared buffers cached
Mem: 1010 997 13 0 1 400
Swap: 3047 64 2983
Total: 4057 1061 2996
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
You must be signed in to comment.
What's this?
commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
Similar Commands
Stay in the loop…
- Follow the Tweets.
-
Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10 - Subscribe to the feeds.
-
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
- » all commands
- » commands with 3 up-votes (commandlinefu3)
- » commands with 10 up-votes (commandlinefu10)
sudo bximage -hd -mode=flat -size=1024 -q /swapfile; sudo mkswap /swapfile; sudo swapon /swapfileAs it is much less resource (i.e. cpu and hd) consumingtime dd if=/dev/zero of=/swapfile bs=1024 count=1024000(...) dd if=/dev/zero of=/swapfile bs=1024 count=1024000 0.33s user 7.34s system 34% cpu 22.552 totaltime bximage -hd -mode=flat -size=1024 -q .swapfile(...) bximage -hd -mode=flat -size=1024 -q /swapfile 0.00s user 0.00s system 58% cpu 0.005 totaltime /sbin/mkswap /swapfilemkswap: d.img: warning: don't erase bootbits sectors on whole disk. Use -f to force. Setting up swapspace version 1, size = 1048316 KiB no label, UUID=xxxxxxxx /sbin/mkswap /swapfile 0.00s user 0.00s system 0% cpu 0.647 total bximage is part of boche emulator - but is is suitable as we are not interested in any particular content (zero) so we don't mind garbage inside.