Difference between revisions of "Firefox on RAM"
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Revision as of 12:04, 16 January 2011
Assuming that there is memory to spare, caching all, or part of Firefox's profile to RAM using tmpfs offers significant advantages. Even though opting for the partial route is an improvement by itself, the latter can make Firefox even more responsive compared to its stock configuration. Benefits include, among others:
- reduced disk read/writes (ideal for SSD)
- heightened responsive feel
- many operations within Firefox, such as quick search and history queries, are nearly instantaneous
Both of previously mentioned options make use of native shared memory; /dev/shm, a directory that behaves just as ordinary mounted file systems do, only with the notable exception that all of its content is stored in RAM.
Because data placed therein cannot survive a shutdown, a script used when moving the whole profile to RAM overcomes this limitation by syncing back to disk prior system shut down, whereas only relocating the cache is a quick, less inclusive solution.
Relocating only the cache to RAM
Adapted from this forum post
After entering Template:Codeline into the address bar, create a new string by right-clicking in the bottom half, selecting New, followed by String. Assign its value:
Now, double-click the newly created string and direct it towards the RAM directory:
Finally, create the directory and ensure its permissions have security in mind:
install -dm700 /dev/shm/firefox-cache
Upon restarting Firefox, it will start using Template:Filename as the cache directory. Do mind that the directory and its contents will not be saved after a reboot using this method.
Relocating the entire profile to RAM
Before you start
$ tar zcvfp ~/firefox_profile_backup.tar.gz ~/.mozilla/firefox/xyz.default
Adapted from verot.net's Speed up Firefox with tmpfs
The script will first move Firefox's profile to a new static location, make a sub-directory in Template:Filename, softlink to it and later populate it with the contents of the profile. As before, replace the bold sections to suit. The only value that absolutely needs to be altered is, again, Template:Codeline.
Close Firefox, make the script executable and test it:
$ killall firefox; chmod +x ~/bin/firefox-sync; ~/bin/firefox-sync
Run Firefox again to gauge the results. The second time the script runs, it will then preserve the RAM profile by copying it back to disk. Firefox could be called firefox-bin as well
$ killall firefox-bin; chmod +x ~/bin/firefox-sync; ~/bin/firefox-sync
From the AUR
The script is available as a package. This version automatically picks the first Template:Codeline directory in your Template:Filename (although that means you should install it with sudo, not as root).
The script also provides a firefox wrapper Template:Codeline, which runs Template:Codeline before and after Template:Codeline. This is an alternative to syncing with cron, or on login/logout (described below). Be careful with the "Restart Firefox" button within firefox, though, since this might not start the wrapper.
Seeing that forgetting to sync the profile can lead to disastrous results, automating the process seems like a logical course of action.
$ crontab -e
Add a line to start the script every 30 minutes,
*/30 * * * * ~/bin/firefox-sync
or add the following to do so every 2 hours:
0 */2 * * * ~/bin/firefox-sync
Sync at login/logout
Deeming bash is being used, add the script to the login/logout files:
$ echo '~/bin/firefox-sync' | tee -a ~/.bash_logout ~/.bash_login >/dev/null