Question

Is the RAM your paying for dedicated or burst?

Posted June 6, 2013 3.8k views
For example, on the lowest level plan you get 512mb, is the actual RAM 256mb with a 256mb burst?

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8 answers
Swapping on SSD will still be terrible, just not as bad as on spinning disks. RAM access latency is measured in single digit nanoseconds, SSD access latency is 50-100 microseconds, HD access latency is 11-20 milliseconds. So, SSDs are 200x quicker to respond than harddrives, but still about 10,000 times slower than RAM.
Actual RAM is 512 Mb.
All RAM is dedicated to your droplet. The kernel does take a bit of RAM so you'll end up with ~490MB memory on the 512MB droplet.
Any bursting allowed?
@sb73542 you can set up swap on your droplet: https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04
by Etel Sverdlov
Linux swaps allow a system to harness more memory than was originally physically available. Here's how to set up a linux swap file on Ubuntu 12.04
Ah, interesting option. How is swap performance on SSD? I imagine it's considerably closer to that of actual RAM.

Any instructions for CentOS / Debian?
The Ubuntu article should work on Debian. We have another article for CentOS: https://www.digitalocean.com/community/articles/how-to-add-swap-on-centos-6
by Etel Sverdlov
Linux swaps allow a system to harness more memory than was originally physically available. Here's how to set up a linux swap file on CentOS 6
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