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I'm using t1.micro EC2 instance with Amazon Linux. Since the micro instance has limited RAM (589MB RAM in total), it is insufficient for many operations such as installing & compiling Python packages. Some tutorials suggest me to make use of a Swap file to increase performance, as follow:

sudo fallocate -l 1G /tmp/swapfile
sudo chmod 600 /tmp/swapfile
sudo mkswap /tmp/swapfile
sudo swapon /tmp/swapfile

and remove it by:

sudo swapoff /tmp/swapfile
sudo rm /tmp/swapfile

I think this will increase Disk I/O, but it will benefit the overall performance. Should I enable a large swap file when the OS is booted up & leave it always active? If yes, how to achieve this?

FYI: the output of the free -m command is as follow:

[ec2-user@myhostname ~]$ free -m
             total       used       free     shared    buffers     cached
Mem:           589        340        249          0         13         97
-/+ buffers/cache:        229        360
Swap:            0          0          0

1 Answer 1

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Create a swap space by:

sudo dd if=/dev/zero of=/tmp/swapfile bs=1M count=1024 
    (# bs*count = file size)

sudo mkswap /tmp/swapfile

sudo chmod 600 /tmp/swapfile
    (# for security reasons)

sudo swapon /tmp/swapfile

free -h

Remove by:

swapoff /tmp/swapfile

rm -f /tmp/swapfile
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  • The main question is, should I do so? I have already listed out how to make swap file in my question.
    – Raptor
    May 29, 2017 at 7:36
  • 2
    Yes,if you need more space to run programs
    – FrontENG
    May 29, 2017 at 7:38
  • Apart from increased Disk I/O, is there any drawbacks by doing so?
    – Raptor
    May 29, 2017 at 7:55
  • The only way is to switch to an instance with more ram.
    – FrontENG
    May 29, 2017 at 8:06

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