I am using a 512MB Ubuntu 12 VPS. I'd like to get a daily (maximum) memory consumption log, as a reference to add more memory or not.
Is there a tool for this?
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I recommend Munin for trending your system statistics.
$ sudo apt-get install munin munin-node
This will install two packages,
munin for aggregating data and
munin-node for collection of data from your system. When munin has been running for a while, you can take a look at the visualized data from it and consider if you need more memory or not.
By default, munin will create HTML-files in the directory
/var/cache/munin/www. Serve these files by a web server and start watching your system trends.
It is also a great tool for trending other statistics.